Lens or lensed quasar
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Budgieye
moderator
Quasar by the spectrum, not sure if it is a lens or lensed, and the reference cited has too many objects for me to look up.
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237657607494107310
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CeciliaB
I got my information from the 10th reference in the NED page connected with the quasar.
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CeciliaB
http://ned.ipac.caltech.edu/cgi-bin/ex_refcode?refcode=2012AJ....143..119I
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I searched in that paper in the tables that contain the actual lensed quasars, there are not many. The rest of the 50,000+ NED objects are only candidates / targets in the paper.
So I suspect it was only a target candidate, so it still gets referenced to this quasar lens paper in NED like all the other target non-lens quasars. A bit misleading reference that way.
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CeciliaB
Thanks for your research. It's not easy to interpret what one finds in all the information available!
One thing I do find strange about the image is that the lensed objects have two different colours (red and blue). Lensed objects are supposed to have the same colour if they come from the same source.
So the objects may not be lensed after all.
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Ghost_Sheep_SWR
in response to CeciliaB's comment.
Yeah I sometimes like to 'dig in' to get more info or confirmation. But don't take my word for it! I can be wrong ( and have been many times 😃 ), maybe you do find it in the paper as lens. But I also figured as it isn't a 'lens' object in NED or SIMBAD it probably isn't, just a former quasar lens candidate.
What image are you referring to?
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CeciliaB
What I am referring to can't be seen straight away in image AGZ000emr5. I used 'navigate' to get to the quasar below the galaxy. The objects I mentioned are seen round that quasar.
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Budgieye
moderator
The quasar is z=1.9. We can't see ordinary galaxies at that distance, their light is redshifted to infrared. So the red galaxy is closer to us than the quasar, and the red galaxy is not lensed by the quasar.PAGE 2Â Galaxy Redshift Chart https://talk.galaxyzoo.org/#/boards/BGZ0000007/discussions/DGZ0000ulp?page=2
Are they talking about the quasar itself being lensed? I don't see two images.
Are both quasar and red galaxy being lensed?
Image is slightly clearer in PanSTARSS. See the red galaxy bent into an arc shape. Quasar is not in the center of the arc.
quasar in PanSTARRS
and here is the spectrum, I don't see any extra peaks here.
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c_cld
QSO can't be a lens at redshift 1.9 for a source at minimum redshift ~3... which is not the case here for south star 1237657607494107322 and north galaxy 1237657607494107319.
QSO is not a blend of 2 bimodal color objects...
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c_cld
In Simbad there are 280 records of lensed QSO for the whole sky, a lot outside the SDSS footprint.
If interested I could post a table of the list with coordinates.
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Budgieye
moderator
Can the red galaxy be a quasar or superluminous galaxy of z=5?
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c_cld
So it would be one QSO in same line of sight of the foreground but no lensing.
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CeciliaB
Many thanks to everybody taking part in this interesting discussion!
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c_cld
From Simbad (one component selected if many labelled images A, B, C,..)
| Objid | coord1 (ICRS,J2000/2000) | identifier | typ | redshift | Mag V | |---------------------|---------------------------|-----------------------------|-----|----------|--------| | 1237669767088374046 | 018.659675 +07.374819 | [MOK2016] SDSS J0114+0722 B | LeQ | 1.828 | 22.98 | | 1237670956251022016 | 023.6484117 -09.5175381 | [WLC2002] J0134-0931 B | LeQ | ~ | ~ | | 1237670955715330055 | 026.3192100 -09.7548242 | QSO B0142-100 | QSO | 2.730 | 16.95 | | 1237679323397488872 | 033.34525 -04.35953 | [MOK2016] SDSS J0213-0421 A | QSO | 1.911 | ~ | | 1237652900229218318 | 041.6421025 -08.4266956 | [VV2006] J024634.1-082536 | QSO | 1.686 | 18.2 | | 1237678438092046880 | 044.169388 +01.891683 | [MOK2016] SDSS J0256+0153 B | LeQ | 2.600 | 22.33 | | 1237663918411219235 | 114.286154 +48.430958 | [MOK2016] SDSS J0737+4825 A | LeQ | 2.892 | 19.26 | | 1237657595682226304 | 115.0560067 +29.4466731 | [VV2006] J074013.4+292648 | QSO | 0.980 | 18.81 | | 1237657774996455813 | 115.9692296 +24.9621378 | [VV2006] J074352.7+245743 | QSO | 2.165 | 19.33 | | 1237651497367371968 | 116.72058 +44.06439 | [IOB2007] SDSS J0746+4403 B | LeQ | ~ | 19.97 | | 1237657775534572691 | 117.922988 +27.275497 | QSO J0751+2716 | QSO | 3.200 | 18.7 | | 1237664092895052186 | 121.59842 +20.10864 | [IOB2006] SDSS J0806+2006 B | LeQ | ~ | ~ | | 1237660958107762863 | 123.3803858 +25.7508503 | QSO B0810+2554 | QSO | 1.510 | 16.18 | | 1237660669804609955 | 124.6267500 +06.0271833 | [MOK2016] SDSS J0818+0601 B | QSO | 2.361 | ~ | | 1237663547439579347 | 124.99821 +53.93947 | [IOS2009] SDSS J0819+5356 B | LeQ | ~ | 21.84 | | 1237671123219251319 | 125.0671375 +08.2044247 | [VV2006] J082016.1+081215 | QSO | 2.024 | 19.58 | | 1237667783346487621 | 125.41175 +12.29231 | HS 0818+1227B | LeQ | ~ | ~ | | 1237661066553262926 | 125.4301708 +07.5958633 | [MOK2016] SDSS J0821+0735 B | QSO | 2.387 | ~ | | 1237653589021163874 | 125.494092 +45.712242 | [MOK2016] SDSS J0821+4542 B | LeQ | 2.066 | 21.54 | | 1237651272960901217 | 127.92350 +52.75486 | JCMTSF J083141.3+524518 | LeQ | ~ | ~ | | 1237658423539859822 | 128.0708912 +04.0680611 | [VV2006] J083217.0+040405 | QSO | 1.116 | 19.29 | | 1237654381440073922 | 135.8956146 +50.4720258 | [VV2006] J090334.9+502819 | QSO | 3.584 | 21.49 | | 1237667782814269550 | 136.017502 +15.215081 | 2MASS J09040420+1512542 | QSO | 1.826 | 18.18 | | 1237658424617926771 | 137.8650217 +05.8484114 | QSO B0908+0603 | QSO | 2.795 | 18.16 | | 1237654382515060783 | 138.2542971 +52.9913517 | QSO B0909+5312 | QSO | 1.377 | 16.71 | | 1237657242970423363 | 140.3033 +45.4847 | [VV2006] J092112.8+452905 | QSO | 1.660 | 18.71 | | 1237664879412248923 | 140.313979 +28.912528 | [MOK2016] SDSS J0921+2854 B | LeQ | 1.410 | 20.93 | | 1237673708259508232 | 141.2323579 +02.3235253 | [IBB2003] SDSS J0924+0219 C | LeI | ~ | ~ | | 1237657775008842458 | 142.1627000 +43.5450392 | [MOK2016] SDSS J0928+4332 B | QSO | 2.995 | ~ | | 1237657242434273539 | 142.5874417 +46.2397944 | [MOK2016] SDSS J0930+4614 B | QSO | 2.394 | ~ | | 1237667112262107167 | 147.844287 +26.587217 | [SGB98] J0951+2635 A | LeQ | ~ | 17.31 | | 1237651752923365614 | 149.8583 +01.2628 | [VV2006] J095926.0+011546 | QSO | 1.404 | ~ | | 1237658304350257269 | 150.3362 +55.8988 | 7C 095757.60+560823.00 | QSO | 1.413 | 16.95 | | 1237657591387848790 | 150.368129 +50.466225 | [OIH2005] SDSS J1001+5027 B | LeI | ~ | ~ | | 1237657591387848789 | 150.3692217 +50.4658250 | [VV2006] J100128.5+502758 | QSO | 1.841 | 17.7 | | 1237664105779102823 | 151.1037 +12.4894 | [LGB2002] J1004+1229 A | LeQ | ~ | ~ | | 1237660634382663747 | 151.1408 +41.2097 | QSO J1004+4112C | QSO | 1.734 | 19.68 | | 1237660634382663744 | 151.145017 +41.210894 | QSO J1004+4112A | QSO | 1.734 | 18.62 | | 1237654870535635126 | 153.0000 -03.1000 | [LFK2000] 1009-0252 G | G | 0.871 | ~ | | 1237654870535634989 | 153.0650 -03.1169 | QSO B1009-0252C | QSO | 1.626 | 18.79 | | 1237657630057824393 | 155.29558 +49.22533 | [PEG2006] SDSS J1021+4913 B | LeQ | ~ | ~ | | 1237667210518659652 | 157.306833 +26.394014 | [IOM2006] SDSS J1029+2623 C | LeQ | ~ | ~ | | 1237667210518659208 | 157.30808 +26.38831 | [IOM2006] SDSS J1029+2623 A | LeQ | 2.197 | ~ | | 1237658300070887751 | 158.39176788 +07.19059661 | QSO B1030+074 | QSO | 1.535 | 20.34 | | 1237658425163972637 | 158.8306708 +07.8827522 | [VV2006] J103519.4+075258 | QSO | 1.215 | 19.39 | | 1237661874006589731 | 160.85362 +43.34706 | [MOK2016] SDSS J1043+4320 A | QSO | 2.245 | ~ | | 1237667210521214984 | 163.670166 +27.551788 | 2MASS J10544085+2733062 | QSO | 1.452 | 17.21 | | 1237661358611890302 | 163.93937 +46.47792 | [KIO2010] SDSS J1055+4628 B | LeQ | ~ | 21.07 | | 1237661972252590209 | 169.570633 +07.766164 | QSO B1115+080A | QSO | 1.735 | 16.44 | | 1237651539246645365 | 170.0504113 +67.1877444 | [VV2006] J112012.1+671116 | QSO | 1.495 | 19 | | 1237651752932540463 | 170.83533 +01.63147 | QSO B1120+019B | LeQ | 1.477 | 20.1 | | 1237657222025576625 | 171.23017 +57.18236 | [MOK2016] SDSS J1124+5710 A | QSO | 2.309 | ~ | | 1237667911124975631 | 172.076989 +24.038137 | 2MASS J11281847+2402172 | QSO | 1.608 | 18.55 | | 1237668293374574736 | 172.990716 +19.257771 | 2MASS J11315777+1915279 | QSO | 2.915 | 18.51 | | 1237654030866710722 | 174.5155525 +03.2493867 | QSO J1138+0314 | QSO | 2.443 | 19.17 | | 1237651274046308392 | 174.5382275 +68.1273725 | [VV2006] J113809.2+680738 | QSO | 0.769 | 18.11 | | 1237671139870965810 | 177.8141175 +00.6408161 | LBQS 1148+0055 | QSO | 1.881 | 18.01 | | 1237654398081171702 | 178.821187 +63.772664 | [PEI2004] QSO B | LeI | ~ | ~ | | 1237668297664692248 | 178.8262 +19.6617 | [VV2000] J115518.3+193942 | QSO | 1.019 | 16.89 | | 1237662196136083468 | 181.6235408 +43.5382017 | [VV2006] J120629.6+433217 | QSO | 1.789 | 17.74 | | 1237671127520247971 | 182.73762 +09.90750 | QSO B1208+101 | QSO | 3.803 | 17.5 | | 1237665129080553572 | 184.1917992 +35.4948742 | [VV2010] J121646.0+352941 | QSO | 2.013 | 19.37 | | 1237648721233576010 | 186.5334717 -00.1006344 | QSO J1226-0006 | QSO | 1.126 | 18.54 | | 1237667254018769025 | 192.78142 +29.59461 | 2MASS J12510753+2935405 | QSO | 0.802 | 19.22 | | 1237667735586078853 | 193.57854 +22.59331 | [IOS2009] SDSS J1254+2235 B | LeQ | ~ | 20.71 | | 1237668297133916570 | 193.667896 +18.953178 | [MOK2016] SDSS J1254+1857 B | LeQ | 1.717 | ~ | | 1237668589727056012 | 194.57983 +16.95475 | [IOS2009] SDSS J1258+1657 B | LeQ | ~ | 19.78 | | 1237668272432742430 | 196.18162 +20.01836 | [KIO2010] SDSS J1304+2001 B | LeQ | ~ | 20.23 | | 1237661386526949657 | 197.3639083 +56.2947669 | [MOK2016] SDSS J1309+5617 B | QSO | 2.515 | ~ | | 1237661958830621410 | 198.416437 +51.874878 | [OOJ2007] SDSS J1313+5151 B | LeQ | ~ | 19.66 | | 1237661958830686214 | 198.4165871 +51.8579261 | QSO J1312+5151 | QSO | 1.877 | 18.06 | | 1237671956977549538 | 200.6517192 +10.8776483 | [VV2006] J132236.5+105239 | QSO | 1.717 | 19.2 | | 1237662224073490591 | 202.530542 +38.012172 | [MOK2016] SDSS J1330+3800 A | LeQ | 2.254 | 19.52 | | 1237668270824816739 | 202.57746 +18.17594 | [OIB2008] SDSS J1330+1810 C | LeI | ~ | 19.89 | | 1237671955907084392 | 203.0942892 +03.7944200 | [VV2006] J133222.6+034739 | QSO | 1.438 | 18.54 | | 1237665128013824800 | 203.5583750 +33.2595378 | [ROI2011] A | LeQ | ~ | ~ | | 1237651752410153013 | 203.8949658 +01.3014878 | LBQS 1333+0133 | QSO | 1.571 | 18.17 | | 1237664289399963688 | 204.779742 +13.177672 | SDSS J133907.23+131038.7 | QSO | 2.241 | 19.25 | | 1237661818177192023 | 207.3743579 +12.4519308 | [VV2006] J134929.8+122707 | QSO | 1.722 | 17.79 | | 1237662199348920346 | 208.27637 +11.63428 | [IOB2006] SDSS J1353+1138 B | LeQ | ~ | ~ | | 1237665127479443603 | 210.053222 +31.581701 | SDSS J140012.77+313454.1 | LeQ | 3.317 | 20.47 | | 1237668348670902978 | 210.3983 +15.2236 | QSO B1359+154 | QSO | 3.235 | 21.9 | | 1237662264852021499 | 211.314196 +09.991500 | [IOR2014] SDSS J1405+0959 B | LeQ | ~ | 20.43 | | 1237662637436764522 | 211.4869375 +13.8443964 | [MOK2016] SDSS J1405+1350 B | QSO | 2.361 | ~ | | 1237651249893802134 | 211.60246 +61.44439 | [IOB2007] SDSS J1406+6126 B | LeQ | ~ | 20.6 | | 1237659120395944057 | 213.042000 +52.072822 | [MOK2016] SDSS J1412+5204 B | LeQ | 2.952 | 22 | | 1237662199888216081 | 213.94271 +11.49539 | QSO J1415+1129 | QSO | 2.560 | 17.23 | | 1237661416065663093 | 214.3996 +52.4461 | QSO J1417+5226 | QSO | 3.400 | ~ | | 1237665567681347768 | 216.15862 +22.93331 | [PBW92] 1422+231 C | LeI | 3.620 | ~ | | 1237661433782927458 | 220.727558 +40.926439 | [MOK2016] SDSS J1442+4055 B | LeQ | 2.575 | ~ | | 1237661210436174107 | 223.047875 +42.408503 | [MOK2016] SDSS J1452+4224 B | LeQ | 4.819 | ~ | | 1237668270833860808 | 223.75750 +14.79319 | [KIO2010] SDSS J1455+1447 B | LeQ | ~ | 20.3 | | 1237655498673619386 | 224.698250 -02.034767 | [MOK2016] SDSS J1458-0202 A | LeQ | 1.724 | ~ | | 1237662305657487371 | 227.1758358 +33.4673922 | [VV2006] J150842.2+332802 | QSO | 0.877 | 18.07 | | 1237668311624515683 | 228.910329 +15.192992 | SDSS J151538.47+151134.7 | LeQ | ~ | ~ | | 1237655464316698803 | 230.4367 +52.9136 | QSO B1520+530 | QSO | 1.855 | ~ | | 1237659119328493761 | 231.1901354 +44.1637789 | [VV2006] J152445.6+440949 | QSO | 1.210 | 19.42 | | 1237662340010213604 | 234.393229 +30.248747 | [MOK2016] SDSS J1537+3014 B | LeQ | 1.553 | 21.97 | | 1237662305661813173 | 237.21150 +28.50397 | [MOK2016] SDSS J1548+2830 A | QSO | 3.208 | ~ | | 1237668366927004166 | 245.108929 +12.061676 | [VV2010] J162026.1+120342 | QSO | 1.158 | 20.07 | | 1237662501083873340 | 248.45346 +31.56933 | [MBG2001] J1633+3134 C | LeQ | ~ | 22.315 | | 1237662337870004612 | 249.253852 +26.602752 | QSO J1637+2636B | QSO | 1.961 | 19.29 | | 1237654953742237791 | 252.6810200 +42.8636725 | QSO J1650+4251 | QSO | 1.543 | 17.58 | | 1237656567581377069 | 326.691742 -00.795967 | [MOK2016] SDSS J2146-0047 B | LeQ | 2.381 | 21.57 | | 1237680326800114212 | 335.532946 +27.760497 | SDSS J222207.90+274537.7 | LeI | ~ | ~ | | 1237680333778257222 | 335.5333 +27.7594 | [DGS2013] SDSS J2222+2745 | gLS | ~ | ~ | | 1237680306936807837 | 341.48229 +25.80983 | [MOK2016] SDSS J2245+2548 A | QSO | 2.995 | ~ | | 1237656906353213625 | 355.79971 -00.84278 | [JOO2008] image A | LeQ | ~ | ~ |Posted
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c_cld
Serendipitous discovery of quadruply-imaged quasars: two diamonds arXiv:1711.02674 From: John Lucey et al., (Submitted on 7 Nov 2017)
11 34 40.59 -21 03 22.0 (ra = 173.669125, dec = -21.056111)
PanSTARRS-1 stack y/r/g (15.00 arcsec)
2MASXJ13102004-1714578 (ra = 197.583580, dec = -17.249440)
PanSTARRS-1 stack y/r/g (15.00 arcsec)
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mlpeck
This paper that was posted to arxiv a week or two ago might be of interest to gravitational lens hunters: Shu et al. (2017): "The Sloan Lens ACS Survey. XIII. Discovery of 40 New Galaxy-Scale Strong Lenses." Have any of their confirmed lenses been discussed here or on the old forum?
BTW one of the authors is Phil Marshall, who iirc was the lead(?) scientist on the space warps project.
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c_cld
in response to mlpeck's comment.
There are very few chances to visualize SDSS lensing features in the diameter (3 arcseconds) of its spectroscopic fiber so I doubt any discussion occurred on the published new grade A list of objects. A few queries on old and new forum for some DR7 Ids or DR14 Ids give no results.
Quoting the paper
The S4TM survey adopts the strong-lens selection technique that led to the successful discoveries of nearly 150 strong-lens systems (e.g.,Bolton et al. 2008a; Auger et al. 2009; Treu et al. 2011;Brownstein et al. 2012; Brewer et al. 2012; Shu et al.2016b; Marques-Chaves et al. 2017). The underlying principle is to select the candidate that show multiple nebular emission lines in their spectra, collected by an optical fiber at a common redshift which is significantly higher than the candidate itself. Such a special configuration indicates that there are two objects at different redshifts within the same light cone which is usually as narrow as 2-3 arcseconds in diameter, and a lensing event is likely to happen.
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c_cld
S4TM grade-A lenses
(name=SpecObjID)
name ra dec 747668767995095040 25.985736 -10.109358 1750821414409103360 29.875603 -0.103451 1834207545888106496 51.064567 0.751538 1763226924462663680 51.2271 -1.1747595 851312863959083008 118.44256 34.275999 1781346050380949504 118.61884 19.45781 2164075059201730560 119.45412 19.937865 2007593390161553408 126.66608 56.509992 2347595370701285376 131.86536 23.80542 1338731317881235456 132.92455 5.085284 2182024587598915584 140.20117 30.471764 2195609054716389376 148.98956 30.247479 1064082658843191296 149.22848 55.663132 2197788010911655936 152.61166 31.404894 2650479220240705536 157.83755 30.449448 2360042942963410944 160.24377 36.441276 308654661366212608 160.34519 1.206731 1969244348243535872 162.03915 13.231372 1614579550295975936 162.7892 44.652357 1533497164766930944 164.24003 41.687402 2800168933158578176 165.3047 15.394336 1820688228592674816 169.17359 7.4959973 2811384781462333440 171.91124 23.212324 2818282837537482752 174.36919 18.303434 2820536011740702720 175.6593 25.151532 944693283571918848 176.1672 4.6140339 2508522648686848000 183.26552 29.506218 2018772682975242240 195.36198 8.5736709 2973571269049477120 202.63085 17.844586 2388155818332678144 210.79028 33.154936 683532333856352256 217.64488 61.067988 2402828521027168256 218.46512 28.587884 1594379044806223872 235.3428 36.708818 2438865845233936384 235.91643 22.039803 2441114615585728512 237.54426 20.337091 1777860607479932928 238.31724 30.073804 2482723157677467648 241.91873 21.786377 2481587638453168128 248.43402 14.698592 429012699989436416 347.44316 -0.65359198 765767004702402560 351.1157 1.0995739paste ra/dec list in http://skyserver.sdss.org/dr14/en/tools/chart/list.aspx for visualizing lenses
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