compare SDSS and Hubble
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by liometopum
here is a comparison of Hubble vs SDSS
z(spectroscopic) = 0.1890skyserver.sdss.org/dr12/en/tools/chart/navi.aspx?ra=189.482045589298&dec=62.2518317538459&scale=0.2
Posted
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by Budgieye moderator
That is amazing. Here they are side by side for comparison, with magnification adjusted.
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237655369825845399
http://talk.galaxyzoo.org/#/subjects/AGZ000823p
Here are the image descriptions, I have to disable the commands slightly so that they don't actually work and you can see how the images are made.
SDSS image
![enter image description here](ht tp://skyservice.pha.jhu.edu/DR12/ImgCutout/getjpeg.aspx?ra=189.482045589298&dec=62.2518317538459&scale=0.09&width=300&height=300&opt=&query=)
remove space in http to make it work
EDITED
You can "steer" the image in SDSS. Here is an example. Substitute different ra, dec, scale, size. Remove the space in http to make it work, as I had to disable it so it wouldn't make an image.
![](ht tp://casjobs.sdss.org/ImgCutoutDR7/getjpeg.aspx?ra=189.3396&dec=62.21514&scale=0.05&width=350&height=350&opt=&query)
Hubble image
IMG SRC="" WIDTH="300" >
insert " less than" character at the beginning to make it work
insert the image url between " "
http://www.galaxyzoo.org.s3.amazonaws.com/subjects/standard/goods_full_n_30955_standard.jpg
Posted
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by liometopum
Here is another Hubble and SDSS match
z(spectroscopic) = 0.5556. Interestingly, the photometric z given on DR12 is 0.552 ± 0.0433, which is really close to the spectroscopic z.
This one is from Hubble:
(I still cannot get the image to show!!) This one is from SDSS. A diffuse blob.
Posted
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by Budgieye moderator
You can't copy from a SDSS Navigate page, not easily anyway.
Do Navigate, Explore, Finding Chart, height and width 300, mag 0.04 and copy (right click works for me) from the image.
Posted
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by Budgieye moderator
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237655369825780467
What is the ID for the Hubble galaxy?
11897
Posted
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by liometopum
Image AGZ0007zex is the Hubble ID used on Zooniverse
Posted
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by liometopum
Here is another Hubble and SDSS comparison.
z(spectroscopic) = 1.0128
Image AGZ0007zj9
Posted
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by liometopum
z(spectroscopic) = 0.4850
Image AGZ000819r
Hubble image left, SDSS image right
Coordinates 189.3602941 62.3454923
Posted
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by JeanTate
These are spectacular images, thank you liometopum! 😃
The "Hubble" in these images are those from the latest version/iteration of the Hubble Zoo, right? The one with the composite color mapping. Even though it's not chromatic, it does a remarkable job of displaying chromatic-like colors, yellow-ish for old stellar populations, blue-ish for star-forming regions, etc.
Do you know what the image scale of the Hubble images is? My impression is that the whole Hubble image would almost fit in the 'blank space' between the ends of the reticule/cross-hairs. Also, with the image scale and the redshift, it would be fairly straight-forward to estimate the projected physical size of these galaxies, in kpc. Hmm ... maybe I'll have a go at that tomorrow ...
Posted
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by Capella05 moderator
AGZ0008109 || SDSS J123720.02+621632.3
Posted
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by liometopum
Image AGZ0007zeb
SDSS top, Hubble below
z(spectroscopic) 0.410
Posted
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by liometopum in response to Capella05's comment.
Hi Capella. I was hoping others would add to this collection. What I'd like to see is the spectroscopic redshift if available (and photometric if not). After a while we might be able to guess the distances. The one you posted (AGZ0008109) is z(spectroscopic) 0.4379
These might serve as references to help ID SDSS fuzzy blobs too. For a long time, I wished I could see what those blobs looked like, and now we can.
Posted
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by liometopum
It is NOT there, or barely there. This is interesting because you can see where it should be, but it is too faint to show on the SDSS.
Image AGZ0007yzfz(spectroscopic) = 0.9700 for the faint galaxy.
z(spectroscopic) = 0.1363 for the larger, nearer galaxy
THE OTHER GALAXY is z(spectroscopic) 0.1363 The Nearby Galaxy data
Posted
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by Capella05 moderator in response to liometopum's comment.
I am happy to post comparison images, but you need to be cautious about the accompanying redshifts.
For the image I posted, the photometric redshift was anything from ~0.28 to ~0.84! That is a humongous difference! Also, with each survey the colour of the galaxies / objects will change (different colours are assigned to different filters), so it will be really difficult to compare / gauge distance just by looking at colour.
Posted
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by liometopum in response to Capella05's comment.
SIMBAD gives the spectroscopic redshift. In this case it is z(spectroscopic) 0.4379.
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=[BCW2008]+189.333588%2B62.27555SIMBAD also gives a chart of redshift measurements, and for this galaxy, all are close, except one probable aberrant.
In terms of caution, my worry is "did I get the right galaxy?". I use Aladin, and only go with a direct, exactly on the crosshairs, hit. I wish GZ would give us the GOODS number for the target galaxy, as that would help confirm it.
Posted
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by liometopum
Capella, one more thought... This is a lot of work, and I am tiring of it. So I don't want to encourage you to load comparisons, as it takes too much time. As things stand now, we can see how much better the Hubble images are, and see that an SDSS blob can be all sorts of things. Maybe this should be considered as 'job done'.
Posted
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by Capella05 moderator in response to liometopum's comment.
Capella, one more thought... This is a lot of work, and I am tiring of it. So I don't want to encourage you to load comparisons, as it takes too much time. As things stand now, we can see how much better the Hubble images are, and see that an SDSS blob can be all sorts of things. Maybe this should be considered as 'job done'.
This is the Zooniverse - you do not have to do everything in one sitting! If we did we would all burn out 😃
I think the comparison images in this thread are awesome - it gives us a perspective of the distance of the GOODS / CANDELS images we are currently classifying, compared to the SDSS ones.
The dataset of this iteration of GZ is very small, so it will most likely be over in another two months (depending on the amount of classifications), just FYI 😃
Posted
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by liometopum
OK. Here is one that wtaskew found.
Image AGZ0007xn7
TKRS 1032 -- Galaxy or GOODS J123541.39+621217.8
z(spectroscopic) 0.45862
Posted
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by vrooje admin, scientist in response to Capella05's comment.
I think the comparison images in this thread are awesome
Me too! 😄
Posted
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by liometopum
z(spectroscopic) 0.52852
Posted
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by liometopum
z(spectroscopic) = 0.2530
galaxy name is [BCW2008] 189.220123+62.30213 or TKRS 2974
Posted
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by liometopum
z(spectroscopic) 0.1063
GOODS J123715.96+621158.9 or TKRS 10954
Posted
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by liometopum
z(spectroscopic) 0.5286
[CCH2004] R 30340 or TKRS 9445
Posted
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by liometopum
z(~) 0.214
name: CXOHDFN J123727.7+621034
Posted
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by liometopum
z(spectroscopic) 0.8428
name: [BCW2008] 189.162064+62.15099 or TKRS 9457
Posted
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by liometopum
z(spectroscopic) 0.4330
GOODS J123650.21+620844.5
Posted
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by liometopum
z(spectroscopic) 0.6770
name: 2XMM J123658.8+621435 -- Seyfert 1 Galaxy or TKRS 6709
Posted
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by liometopum
z(spectroscopic) 0.0790
name: MODS deep 1 or TKRS 6858
Posted
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by liometopum
z(spectroscopic) 0.411
[CHB2000] O3716.82-1007.4
Posted
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by liometopum
z(spectroscopic) 0.5190
name: PEARS 34967 or TKRS 6961
Posted
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by liometopum
z(~) 0.5111 (assumably photometric)
name: TKRS 13718 or GOODS J123752.57+621449.4
Posted
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by liometopum
z(spectroscopic) 0.8530
TKRS 11393 -- Seyfert 2 Galaxy
Posted
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by liometopum
z(spectroscopic) 0.8350
name: MODS wide 10027 or TKRS 6281 or GOODS J123735.32+621918.2
Posted
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by liometopum
z(spectroscopic) 0.18913
name: TKRS 9545 or GOODS J123757.06+621805.3
Posted
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by liometopum
z unknown
name: unknown
RA: 188.9252735, DEC: 62.1714323
Posted
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by liometopum
z(spectroscopic) 0.5120
name: MODS deep 3607 or TKRS 7702
note... you cannot see this galaxy at z=0.5
Posted
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by liometopum
In the SDSS image, we are cross-haired on the STAR. This is a very dim star, that you can barely see on SDSS. The adjacent barred spiral is not visible at all.
star name: [BCW2008] 189.472992+62.28870 or TKRS 9778
Posted
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by liometopum
z(spectroscopic) 0.9380
name: NAME SMM J123653+621119 -- Active Galaxy Nucleus or TKRS 9041
The SDSS image in placed in invert. Is that barely visible item TKRS 9041 or an artifact? You decide.
Posted
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by liometopum
z(spectroscopic) 0.1369
GNS 847 or TKRS 8794
Posted
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by liometopum
z(spectroscopic) 0.1363
name: MODS deep 2 or TKRS 10998
Posted
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by liometopum
The red blob slightly off center in the SDSS image is the elliptical galaxy visible in the Hubble image at top right corner
z(spectroscopic) 0.8419
name: [CBH2004] 189.019714+62.13688
Posted
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by liometopum
z(~) 0.2809 (assumably photometric)
name: TKRS 2550 or GOODS J123724.34+622157.8
Posted
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by liometopum
Comparing DR6 to DR12 for image AGZ000816r
name: TKRS 2550 or GOODS J123724.34+622157.8
On the left is the image from DR6 (it says DR5). On right is what we pull up using DR12 . I noticed that wtaskew had looked at this galaxy also, using the SDSS finding chart, and posted in the comments that the SDSS image looked different from the Hubble image. This side-by-side comparison shows a difference in image quality between the two SDSS versions. That was a surprise to me.
Posted
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by liometopum
z(spectroscopic) 0.8447 is for [TEL2005] 1287 , the elliptical
z(spectroscopic) 0.3207 is z for the galaxy slightly to right and up, which is TKRS 8399 or [CBH2004] 189.131699+62.15236
The second, smaller elliptical apparently does not show up in the SDSS image and appears to be yet further away.
Link to SIMBAD data for TEL2005 1287
Link to SIMBAD data for TKRS 8399
Posted
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by liometopum
z(spectroscopic) 0.846 for targeted galaxy: GNS 1035
z(spectroscopic) 0.9590 for the galaxy to the right, GNS 1034, or 2XMM J123636.6+621346 -- Seyfert 1 Galaxy
Posted
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by liometopum
z(spectroscopic) 0.0700
name: [BCW2008] 189.426239+62.25509 or TKRS 10578
Posted
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by liometopum
z(spectroscopic) 0.5323
name: MODS wide 10543 or TKRS 3129
Posted
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by liometopum
galaxy on left: z(spectroscopic) 0.2760 name: TKRS 4565 or MODS wide 1021
galaxy on right: z(spectroscopic) 0.2755 name: MODS wide 959 Note: Active Galaxy Nucleus
Posted
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by liometopum
z(spectroscopic) 0.7846
name: [TCC2005] 189.37094 +62.17753
Comment: the scaling is not the same. The large galaxy in the SDSS image is not in the Hubble image.
Posted
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by liometopum
z(spectroscopic) 0.4545
name: TKRS 1711 or GOODS J123645.40+621901.3
189.1891478 62.3170282
Posted
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by liometopum
This data is for the spiral galaxy near the top of the Hubble image.
z(spectroscopic) 0.474
name: [CBB2012] 1HERMES X1.4 J123545.51+620956.4
Posted
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by liometopum
main spiral: z(spectroscopic) 0.4734 name: MODS wide 1992
the irregular galaxy to the left: z(spectroscopic) 0.6944 name: TKRS 4389 or MODS wide 2054
spiral data link
Irregular data link
Posted
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by liometopum
z(spectroscopic) 0.4522
name: [CBH2004] 189.406631+62.37209
The galaxy is just visible in the SDSS image.
Posted
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by liometopum
z(spectroscopic) 0.411
name: TKRS 12931
Posted
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by liometopum
PhotoZ = 0.378 ± 0.0641 (no SIMBAD data)
name: SDSS J123732.27+620933.7
Posted
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by liometopum
z(spectroscopic) 0.7837
name: TKRS 2884 or MODS deep 2617
Posted
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by liometopum
z(spectroscopic) 0.474
name: [CBB2012] 1HERMES X1.4 J123545.51+620956.4
Posted
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by liometopum
one of the galaxies is GNS 2975 with z(spectroscopic) 0.5150
SIMBAD does not appear to recognize the second galaxy.
coordinates: 189.0704401 62.2437371
Posted
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by liometopum
no spectroscopic Z data
SDSS J123803.44+621806.2
Posted
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by liometopum
No spectroscopic z data
the spiral, to right, off center, is [MOD2010] 1374 -- Radio-source.. For data on it, click here
Posted
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by liometopum
centered oblong blob:
z(spectroscopic) 0.8620
name: GOODS J123727.34+622106.7
data linkThe large edge-on, to right:
z(spectroscopic) 0.2800
name: TKRS 4023
data link
Posted
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by Budgieye moderator
Possbily the blue spiral arms are green in the SDSS image?
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237655369825845851
http://talk.galaxyzoo.org/#/subjects/AGZ000826z
SDSS J123803.13+621818.4Posted
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by c_cld
http://www.galaxyzoo.org/#/examine/AGZ0007yzq
GDS_N_9120 1237655369825780300
Posted
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by liometopum
z(spectroscopic) 0.63481
name: TKRS 12022
data link
Posted
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by liometopum
z(spectroscopic) 0.0790
name: TKRS 6858
Posted
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by liometopum
Unknown redshift. Galaxy not on SIMBAD
Posted
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by liometopum
z(spectroscopic) 0.55917
name: TKRS 2090
Posted
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by liometopum
no Z data
Note: on the SDSS image, you can see a faint red blob to lower left. Than must be the small galaxy visible in the Hubble image
name: 2MASS J12365350+6206113 -- X-ray source
data link
Posted
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by liometopum
z(spectroscopic) 0.45642
name: TKRS 4732
This higher magnification SDSS image shows the small elliptical beneath the target galaxy as a reddish blob.
Posted
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by liometopum
No Z data
One of those galaxies is [MOD2010] 1052 -- Radio-source
Posted
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by liometopum
z(spectroscopic) 0.4370
name: TKRS 2033
Posted
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by liometopum
z(spectroscopic) 0.63383
name: TKRS 4783
Posted
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by liometopum
Image AGZ0007y65
z(spectroscopic) 0.1360
TKRS 3583
Posted
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by liometopum
z(spectroscopic) 0.61
name: PEARS 120896 -- Emission-line galaxy
Posted
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by liometopum
Target galaxy:
z(spectroscopic) 0.2990 name TKRS 7324 data link
Spiral below: z(~) 0.634 name: CXOHDFN J123735.9+621805 -- Seyfert 2 Galaxy
Posted
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by liometopum
z(spectroscopic) 0.9380
name: TKRS 9041
Posted
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by liometopum
z(spectroscopic) 0.29846
name: TKRS 444
Posted
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by liometopum
target galaxy is z(spectroscopic) 0.5571 name: MODS deep 1335 data link 1335
lower left galaxy: z(spectroscopic) 0.555 name: MODS deep 1344data link 1344
Posted
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by liometopum
z(spectroscopic) 0.1063
name: TKRS 10954
Posted
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by liometopum
target galaxy: z(spectroscopic) 0.410 name: GNS 887 data link GNS 887
left galaxy: z(spectroscopic) 0.5190 name: GNS 888 -- Seyfert 2 Galaxy data link GNS 888
Posted
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by liometopum
z(spectroscopic) 0.6390
name: TKRS 2227
Posted
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by liometopum
z(spectroscopic) 0.2953
name: TKRS 6986
Posted
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by liometopum
z(spectroscopic) 0.474
name: TKRS 7557
Posted
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by liometopum
z(~) 0.3303
TKRS 1335
Posted
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by liometopum
z(spectroscopic) 0.6358
TKRS 8429
Posted
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by liometopum
z(spectroscopic) 1.013
name: TKRS 6673
Posted
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by liometopum
z(spectroscopic) 0.4090
TKRS 6586
Posted
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by liometopum
z(~) 0.104
SDSS image scaled out to show entire spiral galaxy
Posted
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by liometopum
z(spectroscopic) 0.6380
TKRS 3829
Posted
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by liometopum
z(spectroscopic) 0.457
TKRS 5621
Posted
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by Budgieye moderator
You can "steer" the image in SDSS. Here is an example. Substitute different ra, dec, scale, size. Remove the space in http to make it work, as I had to disable it so it wouldn't make an image.
![](ht tp://casjobs.sdss.org/ImgCutoutDR7/getjpeg.aspx?ra=189.3396&dec=62.21514&scale=0.05&width=350&height=350&opt=&query)
Posted
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by c_cld
same but zoomed out
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?ra=189.3385221&dec=62.2132066
1237655464306475119 ; http://talk.galaxyzoo.org/#/subjects/AGZ0008123
Posted
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by liometopum
z(~) 0.298 (probably photometric)
CXOHDFN J123730.6+620943
Posted
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by liometopum
z(spectroscopic) 0.1050
TKRS 11280
Posted
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by liometopum
z(spectroscopic) 0.0787
TKRS 1808
Posted
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by liometopum
z(spectroscopic) 0.50707
TKRS 5511
Posted
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by liometopum
z(spectroscopic) 0.7507
TKRS 7057
Posted
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by liometopum
z(spectroscopic) 0.2953
TKRS 6986
Posted
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by liometopum
z(spectroscopic) 0.4578
TKRS 12293
Posted
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by liometopum
z(spectroscopic) 0.2266
[CBH2004] 188.925873+62.16058 -- Galaxy
Posted
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by liometopum
Posted
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by liometopum
Posted
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by liometopum
Posted