Quasar pair or lensed

by c_cld

quad lensed QSO PG 1115+080: A Gravitational Cloverleaf : http://apod.nasa.gov/apod/ap990331.html

1237661972252590209

1237661972252590210

1237661972252590209

New! optical spectra available in DR12

1237661972252590209 http://dr12.sdss3.org/spectrumDetail?plateid=1617&mjd=53112&fiber=467

1237661972252590210 http://dr12.sdss3.org/spectrumDetail?plateid=5369&mjd=56272&fiber=394

Posted January 7, 2015 7:53 AM
by c_cld

QSO lensed candidate 1237662225166959350 z_spec =0.778

by elliptical 1237662225166959349 z_spec = 0.195

1237662225166959350

previously posted in SpaceWarps 😃

[edit feb 7, 2016] DECaLS DR2 image 30" on side (size 512px)

SDSS J164045.66+193257.1 ra,dec 250.19029, 19.54921

Posted January 7, 2015 8:20 AM
by c_cld

QSO pair candidate

1237667735586078852

1237667735586078853

Posted January 7, 2015 2:54 PM
by c_cld

QSO pair

1237658491211546690

1237658491211546691

Posted January 7, 2015 4:18 PM
by c_cld

Pair candidates

513449971983345664

7946716826951151616

4769394010924707840

7558177726915080192

1323060530469955584

5614997622001168384

1163174772759095296

4727853362149257216

1916390820722796544

6128295558886649856

4724336024401670144

Posted January 8, 2015 11:42 AM
by Budgieye moderator

Excellent list, thank you. Added to index. Are any of these quasar pairs proven to be gravitational lens, ie each object's spectrum taken and proved to be identical?

Posted January 9, 2015 9:53 AM
by c_cld in response to Budgieye's comment.

To my knowledge my proposed QSO pair candidates are not listed in catalogs of
1. Binary QSO
2. pair of QSO not physically associated
3. 2 lensed images of one QSO source
I can't say which is which in my list as for me the resolution of images is too low and the associated spectra by SDSS spectrograph (3 arcsec fiber) and by Boss spectrograph (2 arcsec fiber) could be of overlapping locations.

These QSO need a follow-up investigation by professionals!

Posted January 9, 2015 2:40 PM
by c_cld

Pair candidate

1237656567585112428

1237656567585112427 north of QSO target

Posted January 9, 2015 5:17 PM
by c_cld

Pair QSO

1237663278463385743

and neighbor at 7" with a Boss spectrum having similarities to the SDSS one above

1237663278463320186

Posted January 9, 2015 9:13 PM
by c_cld

9 Feb 2009 Five New High-Redshift Quasar Lenses from the Sloan Digital Sky Survey arXiv:0809.0912v2 Naohisa Inada, Masamune Oguri et al.

We report the discovery of five gravitationally lensed quasars from
the Sloan Digital Sky Survey (SDSS). All five systems are selected as
two-image lensed quasar candidates from a sample of high-redshift
(z>2.2) SDSS quasars. We confirmed their lensing nature with
additional imaging and spectroscopic observations. The new systems are
SDSS J0819+5356 (source redshift z_s=2.237, lens redshift z_l=0.294,
and image separation \theta=4.04"), SDSS J1254+2235 (z_s=3.626,
\theta=1.56"), SDSS J1258+1657 (z_s=2.702, \theta=1.28"), SDSS
J1339+1310 (z_s=2.243, \theta=1.69"), and SDSS J1400+3134 (z_s=3.317,
\theta=1.74").

1237663547439579347 ![8304697474607149056](http://skyserver.sdss.org/dr12/en/get/SpecById.ashx?id=8304697474607149056 =487x348)

587737826214674651 QSO

1237667735586078853

1237668589727056012 ![SpecObjID = 6100292922325528576](http://skyserver.sdss.org/dr12/en/get/SpecById.ashx?id=6100292922325528576 =487x348)

1237664289399963688

1237665127479443603

Posted January 30, 2017 4:07 PM
by c_cld

Galaxies Spectroscopic pair (in CFHTLS wide field) redshift ~1.133 angular separation 2.782" or ~23.2kpc

SDSS J021425.81-074711.3 1237679437740114165

duo SDSS J021425.62-074711.4 1237679437740114166

![SpecObjID = 4947248820276563968](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=4947248820276563968 =609x435)

no visible optical object in between for a lens system?

Decals DR3 cutout

http://legacysurvey.org/viewer/jpeg-cutout/?ra=33.6070&dec=-7.7865&zoom=16&layer=decals-dr3

seen in spacewarps

at 4 o'clock

https://talk.spacewarps.org/#/subjects/ASW0001yyx

Posted February 4, 2017 10:50 AM
by Budgieye moderator

Amazing. no visible galaxy.

Posted February 4, 2017 11:53 AM
by c_cld

QSO pair candidate

SDSS J222050.95-001744.5 1237663478722724231 redshift ~1.603

duo 1237663478722724232 angular separation 2.504" or ~21.6 kpc

Decals DR3

CFHTLS SpaceWarps https://talk.spacewarps.org/#/subjects/ASW000942t

Posted February 4, 2017 1:53 PM
by c_cld

QSO pair candidate

SDSS J221956.72+004332.3 1237663544221892968 redshift ~0.877

duo 1237663544221892969 angular separation 2.465" or 19.3 kpc

CFHTLS SpaceWarps https://talk.spacewarps.org/#/subjects/ASW0008hnf

Posted February 4, 2017 3:08 PM
by c_cld

SDSS J141542.46+570253.2 1237659326017175902 photoZ ~0.77

duo 1237659326017175903 angular separation 2.157"

CFHTLS SpaceWarps https://talk.spacewarps.org/#/subjects/ASW0007cuj or https://talk.spacewarps.org/#/subjects/ASW0007c4g

or at top

Posted February 4, 2017 3:54 PM

So far

name,ra,dec
1237679437740114166,33.6067628554674,-7.78651023499043
1237679437740114165,33.6075433986765,-7.78649554688855
1237667735586078852,193.578949484847,22.5934872941985
1237667735586078853,193.579391262563,22.5933181142013
1237659326017175902,213.926953566413,57.0481362163413
1237659326017175903,213.927145245842,57.0487262635749
1237663544221892969,334.985690036626,0.72562979236122
1237663544221892968,334.986374076623,0.725659542259892
1237656567585112428,335.172125539737,-0.8376480760859
1237656567585112427,335.172238241604,-0.837017773957967
1237663478722724231,335.212329802118,-0.295713609481205
1237663478722724232,335.212604519603,-0.295074749350371
1237663278463320186,357.079959456532,0.954877458026921
1237663278463385743,357.081603890332,0.955965269176277

Continuing the previous search https://talk.spacewarps.org/#/boards/BSW0000005/discussions/DSW0000c1n?page=1

name,ra,dec
1237670955717558313,31.5712849318715,-9.52244180997205
1237670955717558315,31.5728677228089,-9.51854683969808
1237652901299683621,33.9164811914704,-8.31426604684806
1237652901299683622,33.9184231307156,-8.31153275229534
1237679323399192775,37.2401519931029,-4.12591111999425
1237679323399193013,37.2423236053779,-4.1278291627489
1237674461485269353,132.36420005192,-1.23771964937528
1237674461485269352,132.366483157686,-1.23794314331168
1237674460411724146,133.223699903216,-1.81377994607905
1237674460411724147,133.224583788898,-1.81395796692807
1237654872138842242,136.205939672727,-1.36977685123035
1237654872138842241,136.206697192107,-1.36927448493915
1237658803118735478,212.145623420687,52.7533807041506
1237658803118735477,212.14583692639,52.752531110845
1237661417139601563,215.85315382857,53.1676296883768
1237661417139601562,215.85502112343,53.1677229904786
1237659324407480336,215.997864690178,54.8807740825003
1237659324407480337,216.000035775923,54.8802054332098
1237655368759312564,219.996829792729,56.552384413502
1237655368759312565,219.998145507288,56.5523825332854
1237678617406275614,333.541036241311,0.876116488387924
1237678617406275612,333.541516966662,0.874179869267468

Other list of 13 pairs either binary or lensed in CFHTLS wide field

name	ra	dec
1237679253059731673	31.8565340626873	-5.43791141372794
1237679253059731674	31.8573290377197	-5.43749333093702
1237679322323681376	33.3028644312747	-5.09478232613858
1237679322323681375	33.3033855534621	-5.09444585226131
1237679437741228364	36.0671219075269	-7.67509757576134
1237679437741228363	36.0675892906299	-7.67580027419219
1237679253061697791	36.4267169902679	-5.2479051991376
1237679253061697790	36.4269343628097	-5.24682369550601
1237654871065100716	136.116316847415	-2.27274107881559
1237654871065100715	136.117606812599	-2.27284439862038
1237654872138842242	136.205939672727	-1.36977685123035
1237654872138842241	136.206697192107	-1.36927448493915
1237661388679020805	215.830487322917	54.7818809203237
1237661388679020804	215.831568391111	54.7819554674327
1237661387068801194	216.40033422223	53.2134067704764
1237661387068801193	216.401277587652	53.2133434755174
1237659120934060216	217.436401795358	51.4254440064821
1237659120934060217	217.437726687636	51.4263369574257
1237655347811844345	219.635230128376	57.0420545623678
1237655347811844344	219.636657628483	57.0407502034887
1237678777392234930	332.262162381664	4.10758717158677
1237678777392234929	332.262845906746	4.10672342752537
1237678777929236781	332.516924852973	4.50437786550489
1237678777929236780	332.517671621612	4.50294570180507
1237663544221303295	333.52481212622	0.683830708279048
1237663544221303296	333.52483574761	0.684635685180784

Copy and paste in Visual tool Image List

Posted February 5, 2017 4:26 PM

by c_cld

other 8 pairs debatable

name ra dec
1237654870528229804	136.146364374302	-2.50831939670989
1237654870528229803	136.146873765017	-2.50879912898778
1237661385994142029	212.593624637527	53.3436215741848
1237661385994142028	212.594097627622	53.3429441335222
1237661387605934353	217.431689315163	53.2016418842731
1237661387605934352	217.432100876904	53.20021173693
1237661388143133054	219.108374794993	53.2991305100264
1237661388143133055	219.109326266258	53.2993838515613
1237678777928712648	331.297281204048	4.54412167216698
1237678777928712650	331.297717667435	4.54308843323844
1237678619016037008	331.699032818221	2.28852095933454
1237678619016037007	331.699546171895	2.28837790521818
1237678618479821297	333.204424605073	1.81055458861784
1237678618479821298	333.204464216233	1.81021507275149
1237678618480345500	334.264012570462	1.91179512523824
1237678618480345499	334.264178177365	1.91234542352405

Posted February 5, 2017 4:54 PM

by c_cld

Working with catalogue J/MNRAS/450/3893/dame_qso Candidate QSO/AGN Objects from SDSS-DR10

here is a sample of 48 QSO pairs candidates with one spectrum in each pair and angular separation less than 8"

each spectroscopic candidate is flagged "high quality"
identification/redshift

 name	ra	dec
 1237652946381897838	8.5960813	-10.833885
 1237652946381897839	8.597542189	-10.83231037
 1237652628565655729	9.2067453	-11.158291
 1237652628565655730	9.207190309	-11.15949965
 1237679340030984252	32.73381873	-6.650204524
 1237679340030984253	32.734531	-6.651227
 1237651496830435629	117.0140143	43.6936828
 1237651496830435628	117.01695	43.694027
 1237667292643394314	118.9880331	11.71768059
 1237667292643394313	118.98964	11.717036
 1237658299519467876	125.1927		3.9616976
 1237658299519467878	125.1944618	3.961376085
 1237654383585656942	129.2061096	48.6972603
 1237654383585656941	129.20647	48.698356
 1237654605314785573	135.0746554	3.208871955
 1237654605314785572	135.07555	3.2079223
 1237664093979738417	145.38332	33.543976
 1237664093979738416	145.3846855	33.54242627
 1237667210513809593	145.64575	23.175313
 1237667210513809594	145.6459826	23.17466378
 1237667536396025903	148.6228119	19.3365832
 1237667536396025902	148.62408	19.336321
 1237661384384446484	148.7280601	37.57216374
 1237661384384446483	148.72916	37.572219
 1237660634382663743	151.1450294	41.21090801
 1237660634382663744	151.14549	41.211895
 1237661064955101218	154.0852692	10.6807189
 1237661064955101217	154.08619	10.681243
 1237667782285721756	155.43035	19.573732
 1237667782285721757	155.4315518	19.57250765
 1237651271895548018 157.873878827 	64.238797320
 1237651271895548019	157.8763484	64.24012069
 1237658493345398852	162.19254	9.8365216
 1237658493345398853	162.1936892	9.836939094
 1237654030327218343	168.4486821	2.641146751
 1237654030327218342	168.44874	2.6417747
 1237665370119012453	171.25573	32.939662
 1237665370119012454	171.2579442	32.93884373
 1237665024901120033	173.99144	34.496327
 1237665024901120034	173.994012	34.49610141
 1237661850394493046	181.21059	44.476638
 1237661850394493047	181.2116025	44.47618128
 1237662196136083468	181.62353	43.538219
 1237662196136083469	181.6235474	43.53905273
 1237665129080553573	184.1913549	35.49488107
 1237665129080553572	184.19188	35.494863
 1237667448342708289 190.738842965  25.717510980	
 1237667448342708290	190.7380004	25.71743583
 1237668297670131915	191.9907813	19.51274391
 1237668297670131914	191.99211	19.513201
 1237668272969023520	194.7561493	20.39507459
 1237668272969023519	194.75745	20.394984
 1237661950258839642	194.9810958	12.69751757
 1237661950258839641	194.98173	12.698282
 1237654881265320144	195.38545	5.6097615
 1237654881265320145	195.3872472	5.610440742
 1237668624090988656	196.4205489	17.07539013
 1237668624090988655	196.42174	17.076483
 1237655368755380240	204.3045295	60.20268851
 1237655368755380239	204.30477	60.201821
 1237662194533335272	205.7685734	40.53716875
 1237662194533335270	205.76952	40.538405
 1237668273510547611	206.12882	19.809585
 1237668273510547610	206.1288729	19.81088729
 1237661386530226299	210.0674821	54.3601678
 1237661386530226298	210.07032	54.358813
 1237662266456735890	212.3643		5.7690268
 1237662266456735891	212.3651889	5.767488752
 1237659324407480336	215.99785	54.880786
 1237659324407480337	216.0000358	54.88020543
 1237662237480386590	217.2217988	8.358483155
 1237662237480386588	217.22305	8.3569064
 1237662696492302389	219.03812	31.574094
 1237662696492302390	219.0383839	31.57221665
 1237668270833860809	223.7575914	14.79318567
 1237668270833860808	223.75798	14.793021
 1237661435395309668	226.10025	40.260817
 1237661435395309669	226.1013459	40.26147813
 1237664852575125818	226.9454463	29.05948782
 1237664852575125817	226.9468		29.059248
 1237668311624515684	228.9103245	15.19300656
 1237668311624515683	228.9108		15.193319
 1237665535463522472	230.08276	23.68533158
 1237665535463522471	230.0838		23.685182
 1237655742948638901	232.9020542	4.267528729
 1237655742948638899	232.90276	4.2669509
 1237662620262334544	241.51172	29.013554
 1237662620262334543	241.5125739	29.01413204
 1237662301375300067	248.79228	29.189069
 1237662301375300068	248.7929147	29.18783007
 1237662337870004613	249.2536535	26.60381049
 1237662337870004612	249.25388	26.602741
 1237661386546151883	250.79726	31.938444
 1237661386546151884	250.7974541	31.93907209
 1237671934431134103	254.0190635	39.16425563
 1237671934431134102	254.02076	39.163057

Need of a follow up for finding lensed pairs in this sample 😃

known gravitationally lensed quasars in this list 1237660634382663744, 1237665129080553572, 1237662196136083468, 1237668270833860808, 1237668311624515683 !

Posted February 6, 2017 8:44 AM

by c_cld

same cross-matched work with catalogue J/MNRAS/450/3893/dame_qso Candidate QSO/AGN Objects from SDSS-DR10
where each spectroscopic candidate is flagged "basic quality" identification/redshift

below sample of 50 QSO pairs candidates with one spectrum in each pair and angular separation less than 8"

name	ra	dec
1237657189831737419	0.550309	-0.885864
1237657189831737420	0.552218146	-0.886576673
1237678660888428826	2.962788569	4.290072487
1237678660888428827	2.9639	4.289528
1237666089516270009	18.811526	18.137737
1237666089516270010	18.81345386	18.13710187
1237663782595330158	19.550137	-1.078487
1237663782595330159	19.55053772	-1.078204087
1237651252551025216	113.499701	36.674607
1237651252551025217	113.502429	36.67468437
1237663531328340018	115.039367	44.214501
1237663531328340016	115.03981	44.21248921
1237660669804740999	124.977197	5.925939
1237660669804740998	124.9782035	5.924067267
1237664668960030782	126.4211719	23.88305541
1237664668960030781	126.421622	23.884936
1237661125075468586	126.576054	25.375961
1237661125075468585	126.5766167	25.37580364
1237658190540243320	133.1259245	35.0010176
1237658190540243319	133.127219	35.000008
1237670965920989398	136.770981	14.070531
1237670965920989397	136.7711928	14.07254452
1237667255073636550	144.3927793	24.35512446
1237667255073636549	144.394622	24.354342
1237660637066100788	147.4782792	42.13381556
1237660637066100789	147.478797	42.133212
1237665128530116871	148.05885	29.301884
1237665128530116872	148.0591903	29.30038249
1237667537470029994	149.052486	20.388993
1237667537470029993	149.0533777	20.39066423
1237661849847726415	151.704811	38.975597
1237661849847726414	151.705945	38.97755777
1237661945948143862	154.952571	11.181147
1237661945948143861	154.9547588	11.18135076
1237654606399602961	160.2904986	5.24654539
1237654606399602962	160.291706	5.245483
1237653616397189273	160.309117	59.038739
1237653616397189274	160.312797	59.03784745
1237661968497442976	165.2640834	41.65792322
1237661968497442975	165.266308	41.657852
1237664667365998701	167.9517625	37.86230131
1237664667365998700	167.953607	37.863839
1237661967962734804	171.7348861	42.3664422
1237662195596001508	171.735238	42.368507
1237654398616797333	172.1682098	63.79045964
1237654398616797332	172.171263	63.79217
1237661812808220792	176.8268723	12.57772979
1237661812808220791	176.827777	12.576752
1237667735581163766	181.447153	22.859571
1237667735581163765	181.448874	22.86104109
1237661976548147480	187.2439805	8.330058729
1237661976548147481	187.245318	8.331548
1237664289930477750	189.8646313	14.45821596
1237664289930477752	189.864859	14.459634
1237664289930477752	189.864859	14.459634
1237664289930477751	189.866023	14.46070074
1237664818217091319	192.5168062	36.81510422
1237664818217091320	192.518539	36.813683
1237661950260412693	198.667784	12.374744
1237661950260412694	198.6692201	12.37501661
1237665329321148440	200.093928	30.939692
1237665329321148441	200.094332	30.93842589
1237661948651569290	202.725068	10.952429
1237661948651569291	202.7271625	10.95311377
1237664291009724773	202.809121	14.643625
1237664291009724772	202.8095469	14.64289493
1237664293685887413	202.870295	37.620685
1237664293685887412	202.8708913	37.61929249
1237664294223413596	204.7670988	37.79509816
1237664294223413597	204.768611	37.793813
1237661818177192023	207.37435	12.451937
1237661818177192024	207.3750156	12.45246258
1237662237477830711	211.290647	8.791487
1237662237477830712	211.2914108	8.789442207
1237662238551769420	211.82004	9.594416
1237662238551769419	211.8217929	9.594889191
1237661950803051144	212.104889	11.851932
1237661950803050906	212.1064044	11.85039512
1237668349748052165	218.462262	14.835607
1237668349748052166	218.4628564	14.83488939
1237661465445794019	227.141561	39.809067
1237661465445794018	227.1429066	39.81087642
1237662224083910786	229.596074	29.990413
1237662224083910787	229.5976303	29.990991
1237668365311344892	233.3701293	14.4284735
1237668365311344891	233.371547	14.427159
1237662199361372433	236.936013	7.838577
1237662199361372434	236.9378015	7.839275781
1237662237490545337	240.436094	5.670602
1237662237490545336	240.4382023	5.671042621
1237655374651392440	255.894663	32.767322
1237655374651392439	255.8968614	32.76703009
1237654954817815134	256.4194714	39.6795813
1237654954817815135	256.421468	39.679614
1237678777386664320	319.4158661	3.298150127
1237678777386664321	319.417788	3.29827
1237652600639848714	323.415169	-6.754161
1237652600639848715	323.4172286	-6.75408828
1237663458853257512	324.1103603	1.038505042
1237663458853257513	324.110494	1.037149

none of these pairs recorded for now in SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012)!

Posted February 7, 2017 12:37 PM

by c_cld

Possible QSO pair of very high redshift 4.8

SDSS J010232.58+174536.8 1237679169302757879

neighbor distance 0.072 arcmin (4.3")

Posted February 8, 2017 11:22 AM

by c_cld

fortuitous add-on list QSO pair

name	ra	dec
1237680310156329196	2.280916052	31.70496489
1237678893351764491	19.03311555	33.97626674
1237680240922525873	20.75626188	-8.328079747
1237678893353468303	23.57064198	33.1484975
1237663239272464524	42.35281463	0.42674668
1237663915730337832	123.3046042	54.27971279
1237661125075468586	126.5760543	25.37596078
1237651533874594062	135.6489866	56.63229787
1237657591387848789	150.3692164	50.46579603
1237665126924878160	162.128652	31.56141439
1237665015775690905	165.4143601	32.91008639
1237667255621451924	171.8066665	30.43523961
1237658205582131316	173.7291389	50.17549656
1237665440440058087	189.6778056	28.78265193
1237667448342708289	190.738843	25.71751098
1237662661596610965	216.0095978	34.65376851
1237651539792822434	221.9212242	63.45982732
1237655469137199440	231.6057744	1.816104195
1237665532794044633	234.0699392	19.67686176
1237662268078490079	238.075374	4.943132947
1237678617936921055	319.3257214	1.046936906
1237656242243699121	354.9759846	14.90829476

Posted February 8, 2017 11:38 AM

by c_cld

From Spacewarps discussion

binary #QSO

ASW0000p5i

SDSS J085253.68-014849.6 1237674460411724146

SDSS J085253.90-014850.2 1237674460411724147

angular separation = 3.24 arcsec

at 2 o'clock

ASW0003g0t at 7+ o'clock

SDSS J022046.13-110036.4 1237673700203888809 ra 35.1922, dec -11.01012

SDSS J022045.87-110036.7 1237673700203888808

separation 3.837"

at 7+ o'clock

Posted February 11, 2017 2:57 PM

by c_cld

Supplement list of close QSO photometric pairs (color/ separation distance)

name	ra	dec
1237678619031371962	6.761341956102	2.53702924811652
1237678894424392176	16.0938612539931	35.1245598096198
1237680073395798309	22.814118549965	25.1846301331296
1237678918068273445	25.9126574553937	10.4439977934859
1237673700203888808	35.1911270479119	-11.010196335974
1237678439699710127	37.4925525487927	3.34171210198163
1237670016199884880	47.7708409609992	5.83665479239548
1237657595680391337	112.116159371574	26.1173712938146
1237657629503783395	115.605886844467	24.8623137216856
1237673807580889845	120.569766934758	18.2610940056642
1237667781734826843	123.5125206177	10.4386248773277
1237664834851046026	124.515965393978	19.2843084985621
1237674290758025374	124.676191877905	35.8341012635221
1237671260122186466	127.461914814432	8.65502535411082
1237657628437774540	131.154373644306	36.4631610625964
1237674460411724146	133.223699903216	-1.81377994607905
1237667430633177167	146.320525935505	22.4158623006928
1237671261204775166	147.405147681919	13.9961136964496
1237655108369449168	149.781156158473	54.8184576170621
1237657591390142681	158.020687450111	52.6300403230957
1237654605326188677	161.088444275357	4.49712681592054
1237661357001539870	165.354466317898	45.5414321078481
1237671129660719421	173.524021509108	-3.39247280592623
1237661812809400462	179.594897076933	12.5884958250495
1237664289390199144	181.863557810315	14.1389926597735
1237661948642853176	182.490274793424	11.6164853800386
1237655465917939985	193.876874110787	63.1501163288999
1237662300818833833	195.859056701145	51.0131161651666
1237662300819423299	197.849463348683	50.7403670765473
1237671990803693733	204.06291830154	3.14025636262344
1237668333098369225	212.482573989111	16.3336972277018
1237654881274888356	217.230748837723	5.00608386917902
1237668333101646053	220.249824447798	15.2633855360927
1237661388682297515	226.736952220424	50.9362217745302
1237668272447488291	231.049778577211	14.5176604460829
1237659162272202973	235.106694946402	44.7549308512067
1237656563279331695	239.854770238831	80.3694991667171
1237662666427007432	248.819999503874	22.7949869694889
1237662224631398731	252.369959878104	17.5518218116067
1237668680991113604	258.56327340968	45.1331818225503
1237680501283095195	333.033556921221	31.7378473867719
1237680246268887252	339.137250624132	18.0163274759501
1237666434191589803	343.721019209997	23.8985204697495
1237678602373235058	346.256926078148	17.4102300521125
1237678619560771692	349.553825438072	2.8410348552979

Posted February 11, 2017 3:31 PM

by c_cld

Known quad lens system

of 4 QSO images lensed by LRG galaxies group

1237660634382663747 z_spec 0.679

SDSS J100434.18+411243.5 ra=151.142445225&dec=41.212103219

QSO 1237660634382663743, 1237660634382663744 z_spec 1.738, 1237660634382663745, 1237660634382663746

Pan-STARRS cutout z/i/r

Hubble Captures a "Five-Star" Rated Gravitational Lens

Credit: ESA, NASA, K. Sharon (Tel Aviv University) and E. Ofek (Caltech)

Posted February 11, 2017 10:46 PM
by c_cld

Possible gravitationally lensed quasar doubly imaged ?

SDSS J092659.56+062326.7 1237658300600484013

Redshift 0.667

QSO images separation ~ 4.8" (left image at ~1.27" from the lens Galaxy)

possible source lens galaxy
1237658300600484014 photoZ 0.124

DECalS image
residuals

http://legacysurvey.org/viewer?ra=141.7490&dec=6.3904&zoom=16

SDSS J094122.71+051821.6 1237658423010525422

![1118056036356352000](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=1118056036356352000 =609x435)

source lens LRG galaxy 1237658423010525423 blended CIV 1549 line at 3937 Angstrom

separation counter image 1237658423010525424 QSO / image 1237658423010525422 = 0.092 arcmin = ~ 5.5"

DECaLS Pan-STARRS z/r/g

http://legacysurvey.org/viewer/jpeg-cutout/?ra=145.3438&dec=5.3066&zoom=16&layer=decals-dr3

Posted February 14, 2017 5:46 PM
by c_cld

Candidates doubly imaged quasars by gravitational lensing

1237651252550697462SDSS J073223.90+360044.4

![1237651252550697462](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=2334132131552323584 =609x435)

1237660563502137970SDSS J073534.58+203634.1

![1237660563502137970](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=5044158120294486016 =609x435)

1237663530797957374SDSS J083228.49+563234.2

![1237663530797957374](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=2007637370626664448 =609x435)

1237654383585656941SDSS J083649.56+484154.0

![1237654383585656941](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=619362079618394112 =609x435)

1237655370363830429SDSS J125952.05+623021.8

![1237655370363830429](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=7847529605631971328 =609x435)

1237655499744018693SDSS J142758.88-012130.3

![1237655499744018693](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=4535147459056111616 =609x435)

DECALS cutout

1237667733986345165SDSS J143836.26+174538.2

![1237667733986345165](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=6157735532929355776 =609x435)

1237655693556580446SDSS J154107.46-003715.9

![1237655693556580446](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=354698630730377216 =609x435)

SDSS J155752.31+342140.0 1237662473692315813

possible counter image 1237662473692315815 separation 0.118'= 7"

lens 1237662473692315814

Posted February 15, 2017 3:23 PM
by c_cld

Candidate lensed QSO

SDSS J164616.58+440111.7 1237654953741648143

PanSTARRS i/r/g

PanSTARRS z/i/r

Posted February 18, 2017 5:29 PM

by c_cld

Data about objects of recent posts

| IAUname                  | bestobjid           | ra        | dec      | specobjid           | plate | mjd   | fiberid | z     | NeighborObjID       | separation " |
|--------------------------|---------------------|-----------|----------|---------------------|-------|-------|---------|-------|---------------------|--------------|
| SDSS J073223.90+360044.6 | 1237651252550697462 | 113.09961 | 36.01239 | 2334132131552323584 | 2073  | 53728 | 515     | 2.734 | 1237651252550697463 | 5.62         |
| SDSS J073534.58+203634.2 | 1237660563502137970 | 113.89411 | 20.60950 | 5044158120294486016 | 4480  | 55591 | 460     | 2.188 | 1237660563502137971 | 3.54         |
| SDSS J083228.49+563234.2 | 1237663530797957374 | 128.11871 | 56.54285 | 2007637370626664448 | 1783  | 53386 | 574     | 0.683 | 1237663530797957375 | 3.09         |
| SDSS J083649.55+484154.0 | 1237654383585656941 | 129.20647 | 48.69836 | 619362079618394112  | 550   | 51959 | 426     | 1.711 | 1237654383585656942 | 4.07         |
| SDSS J092659.57+062326.7 | 1237658300600484013 | 141.74822 | 6.39077  | 1116985110923601920 | 992   | 52644 | 336     | 0.667 | 1237658300600484014 | 4.58         |
| SDSS J094122.50+051823.8 | 1237658423010525423 | 145.34379 | 5.30664  | 5485441070710788096 | 4872  | 55944 | 206     | 0.343 | 1237658423010525422 | 3.86         |
| SDSS J094122.50+051823.8 | 1237658423010525423 | 145.34379 | 5.30664  | 5485441070710788096 | 4872  | 55944 | 206     | 0.343 | 1237658423010525424 | 1.74         |
| SDSS J094122.71+051821.6 | 1237658423010525422 | 145.34466 | 5.30601  | 1118056036356352000 | 993   | 52710 | 136     | 1.546 | 1237658423010525424 | 5.50         |
| SDSS J125952.05+623022.1 | 1237655370363830429 | 194.96689 | 62.50614 | 7847529605631971328 | 6970  | 56444 | 26      | 2.306 | 1237655370363830428 | 9.06         |
| SDSS J142758.88-012130.3 | 1237655499744018693 | 216.99537 | -1.35844 | 4535147459056111616 | 4028  | 55621 | 82      | 2.269 | 1237655499744018694 | 6.24         |
| SDSS J143836.26+174538.1 | 1237667733986345165 | 219.65111 | 17.76061 | 6157735532929355776 | 5469  | 56037 | 687     | 0.584 | 1237667733986345166 | 8.41         |
| SDSS J154107.46-003716.0 | 1237655693556580446 | 235.28109 | -0.62113 | 354698630730377216  | 315   | 51663 | 146     | 0.754 | 1237655693556580447 | 5.68         |
| SDSS J155752.31+342140.0 | 1237662473692315813 | 239.46799 | 34.36111 | 1595414514344421376 | 1417  | 53141 | 52      | 1.265 | 1237662473692315815 | 7.08         |
| SDSS J164045.57+193255.3 | 1237662225166959350 | 250.18989 | 19.54870 | 4709728187273056256 | 4183  | 55447 | 323     | 0.778 | 1237662225166959351 | 4.81         |
| SDSS J164045.66+193257.2 | 1237662225166959349 | 250.19028 | 19.54922 | 4573611120581808128 | 4062  | 55383 | 748     | 0.195 | 1237662225166959351 | 2.66         |

bestobjid: QSO with spectrum, or lens galaxy if redshift z less than 0.4

NeighborObjid: twin QSO without spectrum, or lens galaxy if separation less than 2

Posted February 20, 2017 1:21 PM

by c_cld

new Candidate doubly imaged quasar by gravitational lensing

qso SDSS J092523.72+435027.7 1237657630053040546 Boss z_spec =1.003

twin candidate qso SDSS J092524.93+435020.0 1237657630053040400 images separation 0.252 arcmin = 15.1"

candidate lens SDSS J092524.61+435022.7 1237657630053040401 z_spec = 0.352

1237657630053040401

PanSTARRS z/r/g

| IAUname                  | bestobjid           | ra        | dec      | specobjid           | plate | mjd   | fiberid | z     | NeighborObjID       | separation |
|--------------------------|---------------------|-----------|----------|---------------------|-------|-------|---------|-------|---------------------|------------|
| SDSS J092524.61+435022.8 | 1237657630053040401 | 141.35257 | 43.83968 | 979640984977565696  | 870   | 52325 | 393     | 0.352 | 1237657630053040400 | 4.34       |
| SDSS J092524.61+435022.8 | 1237657630053040401 | 141.35257 | 43.83968 | 979640984977565696  | 870   | 52325 | 393     | 0.352 | 1237657630053040546 | 10.85      |
| SDSS J092523.72+435027.8 | 1237657630053040546 | 141.34887 | 43.84106 | 5287341517857230848 | 4696  | 56354 | 420     | 1.003 | 1237657630053040400 | 15.13      |
| SDSS J092523.72+435027.8 | 1237657630053040546 | 141.34887 | 43.84106 | 5287341517857230848 | 4696  | 56354 | 420     | 1.003 | 1237657630053040401 | 10.85      |

If lensed QSO confirmed, such a large separation ~ 15 " means that the lensing object /group must be dominated by dark matter (back enveloppe mass calculation ~ 6.52E+13 solar mass!)

Posted February 21, 2017 9:30 AM

by c_cld

Thumbnails sample recap of new lensed quasars candidates from SDSS survey, not yet listed in catalogs and to be confirmed or deprecated as binary or as impostors.

discovered by that kind of viewing among so many pairs 😃

Posted February 24, 2017 11:00 AM
by Ghost_Sheep_SWR

Sounds like a lot of work! 😃

Posted February 24, 2017 10:31 PM
by c_cld

QSO pair candidate or gravitationally lensed QSO by group galaxies?

SDSS J120426.66+015534.8 1237651735757455416 z_spec 1.376

paired with neighbor "star" in QSO color space:

SDSS J120426.14+015527.8 1237651735757455413 ra 181.108937365, dec 1.924388905 separation 0.175' = ~10.5"

PanStarrs z/i/r

Posted March 1, 2017 9:37 AM
by c_cld

More blended QSO wavelenghts lines in spectrum of lens LRG galaxy 1237658423010525423

Vertical lines highlight several of the more prominent features of a QSO at redshift 1.546 like its second image 1237658423010525422

[edit March 29, 2017] Zoom-in

SpecObjID = 5485441070710788096

Below Flux smoothed using the Savitzky-Golay filter of degree 4 and window size 15 Å for clarity:

Posted March 18, 2017 11:59 AM
by c_cld

Follow-up and Analysis of SDSS J1640+1932: a spectacular galaxy-quasar strong lens system arXiv:1703.07495 from Lin Wang, Yiping Shu, Ran Li et al. on 22 Mar 2017

This system was posted by me on Dec 14, 2014 at https://talk.spacewarps.org/#/boards/BSW0000004/discussions/DSW0000enz

and here https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ000167u

1237662225166959350

Posted March 23, 2017 10:00 AM
by c_cld

Candidate doubly lensed QSO

SDSS J221540.44+035849.7 1237678824638120230 ra, dec 333.918516149, 3.980472926

z_spec 3.21

Possible second image 1237678824638120229 at 0.121' = ~7.2"

Blended QSO with galaxy in spectrum

Estimated redshift of "lens galaxy" as 0.264 by plotting some absorption/emission lines on QSO Boss spectrum

Posted March 23, 2017 10:16 AM
by c_cld

Other blended spectra of foreground galaxy with background QSO:

SDSS J011229.41+151213.9; 1237666214607192265 ; z_spec QSO 1.965

Foreground galaxy assessed in DR7 spectrum: 587724199352729851 z_spec 0.139751

![SpecObjID_119004969197109248](http://cas.sdss.org/dr7/en/get/specById.asp?id=119004969197109248 =609x487)

Need of deeper resolution image to confirm lensing system!

SDSS J152846.73+363751.5 1237662336788529435 DR7 z_spec 2.416

Foreground galaxy estimated redshift 0.197 with lines K_3935, H3970, Hß, Mg_5177, Na_5896, SII_6733 overplotted.

SDSS J085241.59+361730.6 ; 1237658204494299462 ; z_spec 1.254 (instead of 1.288

![SpecObjID_2702238454669928448](http://skyserver.sdss.org/dr13/en/get/SpecById.ashx?id=2702238454669928448 =609x435)

Foreground galaxy estimated redshift 0.166

Posted March 30, 2017 4:23 PM
by c_cld

doubly imaged quasar SDSS J100128.61+502756.9 bicolor

known lensing system published in Astrophys.J.622:106-115,2005 after arXiv:astro-ph/0411250v2 15 Dec 2004 From: Masamune Oguri et al.

8199010491307003904

1132780421164066816

SDSS J1001+5027 components A and B

B is evidently reddened.

blue image is put at redshift 1.84132 (zerr 0.00024) by sdss spectrogaph, and pink image is put at redshift 1.84559 (zerr 0.0001176) by boss spectrograph.

I didn't read explanations on these discrepancies. Anyone ?

Posted April 6, 2017 5:11 PM
by c_cld

Composite Quasar Spectra From the Sloan Digital Sky Survey from SDSS Collaboration: Daniel E. Vanden Berk, et al , 14 May 2001

We have created a variety of composite quasar spectra using a
homogeneous data set of over 2200 spectra from the Sloan Digital Sky
Survey (SDSS). The quasar sample spans a redshift range of 0.044 <= z
<= 4.789, and an absolute r' magnitude range of -18.0 to -26.5. The
median composite covers a rest wavelength range from 800 - 8555A, and
reaches a peak signal-to-noise ratio of over 300 per 1A resolution
element in the rest frame. We have identified over 80 emission line
features in the spectrum. Emission line peak velocity shifts of the
broad permitted and semi-forbidden lines are strongly correlated with
ionization energy, as previously suggested, but we find that the
narrow forbidden lines are also shifted by amounts which are strongly
correlated with ionization energy. The magnitude of the forbidden line
shifts is < 100 km/s, compared to shifts of up to 550 km/s for some of
the permitted and semi-forbidden lines. At wavelengths longer than the
Ly-a emission, the continuum of the geometric mean composite is
well-fit by two power-laws, with a break at approximately 5000A. The
frequency power law index, alpha_nu, is -0.44 from 1300 - 5000A, and
-2.45 redward of about 5000A. The abrupt change in slope can be accounted for partly by host galaxy contamination at low redshift.
Stellar absorption lines, including higher-order Balmer lines, seen in
the composites suggest that young or intermediate age stars make a
significant contribution to the light of the host galaxies. An
electronic table of the median quasar template is available.

Posted April 6, 2017 5:55 PM
by c_cld

doubly imaged quasar QSO B0957+5608

Posted April 7, 2017 4:13 PM
by c_cld

Overlaid Spectra of quasars pairs (Spectra are smoothed using the Savitzky-Golay-filter of degree 4 and window size 33 Å for display purposes)

SDSS J211427.36-000025.1

SDSS J160633.43+515011.7

SDSS J024511.94-011317.6

SDSS J234819.19+005717.5

SDSS J142758.88-012130.3

1237655499744018693 and 1237655499744018694 no longer lensed candidates with such redshift gap greater than errors bars!

SDSS J124257.32+254303.0 1237667448342708289 ra,dec 190.738842965, 25.717510980

Posted April 19, 2017 5:00 PM
by c_cld

confirmation of Discovery of three strongly lensed quasars in the Sloan Digital Sky Survey arXiv:1706.01506 Peter R. Williams, Adriano Agnello, Tommaso Treu, et al.

(Submitted on 5 Jun 2017)
We present the discovery of 3 quasar lenses in the Sloan Digital Sky Survey (SDSS), selected using two novel photometry-based selection techniques. The J0941+0518 system, with two point sources separated by 5.46" on either side of a galaxy, has source and lens redshifts zs=1.54 and zl=0.343. The AO-assisted images of J2211+1929 show two point sources separated by 1.04", corresponding to the same quasar at zs=1.07, besides the lens galaxy and Einstein ring. Images of J2257+2349 show two point sources separated by 1.67" on either side of an E/S0 galaxy. The extracted spectra show two images of the same quasar at redshift zs=2.10. In total, the two selection techniques identified 309 lens candidates, including 47 known lenses, and 6 previously ruled out candidates. 55 of the remaining candidates were observed using NIRC2 and ESI at Keck Observatory, EFOSC2 at the ESO-NTT (La Silla), and SAM and the Goodman spectrograph at SOAR. Of the candidates observed, 3 were confirmed as lenses, 36 were ruled out, and 16 remain inconclusive. Taking into account that we recovered known lenses, this gives us a success rate of at least 50/309 (16%). This initial campaign demonstrates the power of purely photometric selection techniques in finding lensed quasars. Developing and refining these techniques is essential for efficient identification of these rare lenses in ongoing and future photometric surveys.

My post on feb 14 shows that lens SDSS J094122.71+051821.6 1237658423010525422 was not missed by my SDSS database query contrary to the conclusion of the publication

The case of J0941+0518 is more surprising: despite
having, coincidentally, a fibre spectrum of the bright
quasar image and one of the lens galaxy and counter-image,
it was missed by previous spectroscopic searches.

Posted June 7, 2017 11:58 AM
by Ghost_Sheep_SWR

I haven't seen interest from Galaxy Zoo scientists for follow up of your lensed quasar (candidate) findings if I'm not misstaken? Pity since this paper sure shows they are interesting enough. Probably also applies to many other types of objects that are flagged here.

Posted June 7, 2017 4:16 PM
by c_cld

multiply lensed quasar PSOJ0147 from the Pan-STARRS survey arXiv:1708.05131 Chien-Hsiu Lee (Subaru Telescope, NAOJ) 17 Aug 2017

Discovery of the first quadruple gravitationally lensed quasar candidate with Pan-STARRS arXiv:1705.08359 Berghea & al

ra, dec 26.7925 46.51203 outside SDSS

PanSTARRS cutout g/r/i 15" on the side

Posted August 19, 2017 8:35 PM
by Ghost_Sheep_SWR

SDSS J044052.30+243115.6 z=0.99175 +/-0.00024

RA,Dec 70.21794822 24.52101833

SDSS / PS1 y/z/i

Posted August 26, 2017 10:22 PM
by c_cld

SDSS J084856.08+011540.0

1237651753452568818 RA, Dec 132.233692403, 1.261116584 (z) 0.645

SpecObjID = 527018220381562880

GAMAJ084856.08+011540.0 CATAID = 301134

Cutout radius (6 arcsec) VSTKIDS_i-VSTKIDS_r-VSTKIDS_g

QSO in pair, or double in lensing system, or grazing a galaxy group? need to find clues in blended spectrum 😃

Posted November 22, 2017 3:33 PM
by c_cld

SDSS J142443.79-005830.7

1237648720172810456 216.182461868, -0.975197058

SPECID = G15_Y3_011_294 (weird spectrum )

GAMAJ142443.78-005830.7 CATAID = 743093

Cutout radius (6 arcsec) VSTKIDS_i-VSTKIDS_r-VSTKIDS_g

QSO pair/lensed? What else?

Posted November 22, 2017 4:34 PM