Galaxy Zoo Talk
That's an interesting beauty. Nothing but a bar and extended tidal tails.
#satellite - first spotted by @iobstc20.
Those can be seen in links from the GZ examine page now, too.
Totally is.
The difference in brightness between the central bulge and the halo is amazing. Would like to see a map of the ages of the stars here....
That's a trainwreck of galaxies. Neat
Neat! Very likely is. Nice spot!
We might have overdone the zoom a bit on this one.
A very cool #merger indeed! Both have SDSS redshifts at z=0.127.
Totally real.
wow!
add that one to the GZ alphabet!
They're important to notice (indicate star formation), but nope - not for any of the specific questions we ask in the interface.
Illustris is only rendering galaxies within the same halo, so mergers are much more likely.
It does - that's rare to see, but it's a gorgeous example.
The green color is because two of the DECaLS bands had bad data going right through the galaxy. http://imgur.com/5tnkyhb
Interesting. It's a very low surface brightness, irregular galaxy (already identified through Galaxy Zoo SDSS). Also named LSBC D584-05.
I agree! Signs of a possible past minor merger.
Tremendous! So much more clear than in the faint SDSS image.
http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=243.72665184&dec=11.095773&scale=0.19806&width=512&height=512&opt=&query=
Wait - likely Sab.
beautiful Sa galaxy.
That is ... odd if it's an artifact. It's unusually well-structured if so. Worth looking at the raw images.
There's a definite extension to the left of the galaxy's bulge; a possible disruption or evidence of a minor merger.
That's a good call - it looks like there's a very faint bridge between the two objects.
It's definitely a star! The disc isn't real, though - it's an artifact of the detector caused by saturation from the bright light.
Neat! It's a bright star in the Milky Way - the colors are due to saturation of the CCD and leaking of energy along rows of the detector.
Likely to be a minor merger, though!
Illustris can't reproduce lensing, unfortunately: http://talk.galaxyzoo.org/#/boards/BGZ0000004/discussions/DGZ0001lon
Might be a star forming region or super cluster within the disk.
That's a good observation. I wouldn't call it another center, necessarily, but a structure within the disk that's separate from the nucleus.
for the star at bottom left, yes. galaxy looks great, though.
likely so. beautiful long #tail near the top of the smaller galaxy.
http://skyserver.sdss.org/dr9/en/tools/chart/chart.asp?ra=339.62461713&dec=-1.17100796
Yes - that looks like a lovely crowded group. Color difference between the group and galaxy at upper left is stronger in the SDSS image.
Probably - it's so thin and looks bright green, which argues for just one filter.
That's a star in the Milky Way. It's pink because it's extremely bright and saturates the detector in the other bands.
Yes - although it might be an #overlapping galaxy in the background. Good spot!
Lots of individuals classify each galaxy, so don't worry if a particular one is difficult. What did you think of this one?
#missing (not sure why it didn't render). For this or any similar ones, please classify as "star or artifact".
Yep - we're always asking you to classify just the object in the center, although you're encouraged to discuss other things on Talk!
And another example of #wrong_size
The galaxies are likely in a group, so the stars in the halos are beginning to overlap. Interesting that we don't see any disturbances yet.
An #arc, but not a gravitational #lens. See attached discussion!
I'd also suggest creating a separate discussion if you have more questions!
http://talk.galaxyzoo.org/#/boards/BGZ0000005/discussions/DGZ0000lv2
That's right. It simulates the effect of the ionized gases that signify star formation in real galaxies, though.
Yep - for example, you could check the redshifts of both galaxies and see if they match!
Always reminds me of the Zooniverse logo.
Yep. Broad Halpha line. http://dr9.sdss3.org/spectrumDetail?plateid=1266&mjd=52709&fiber=202
I'm very happy that this image is named "AGZ000bear".
Definitely. More blue than I'd expect at only 3.8 Msun/yr.
Definitely - they represent star formation in the galaxy. One important thing we're testing their distribution and whether it's realistic.
Yes - this is another example of a galaxy from the Illustris simulation.
The image was supposed to be much more zoomed in on the galaxy at the center, so you wouldn't have seen the star.
The line is horizontal because that's the direction that the individual pixels go when they're reading out the signal to the computer.
It's a line of pixels in the CCD camera that originally took the image that got saturated, because the star is so bright.
And then some! The bridge between the two galaxies is just about unbroken
Nice edge-on.
There is a bright particle there in the pure simulation image. http://www.illustris-project.org/exp/gal_obs/subfolder_070/image_262551.png
Probably an overexposed star, or maybe two.
Galaxy (the small one at the center of the image). This is a problem with the sizing.
Looks like inclined disk up close. http://imagine.legacysurvey.org/?ra=117.08312700241719&dec=18.418966218715607&zoom=14&layer=decals-dr1j
True (neat satellite). This is really more of an issue with sizing; we should have zoomed in more on the galaxy at the center.
Yep. Identifying shell galaxies using Illustris (and how they're formed in mergers) was one of the first science results of these images!
Wow - thanks for the followup, @zutopian. That's a really compact galaxy, then - only 2.5 kpc in size from its Petrosian radius.
Thanks for classifying, Cristian! I'm not sure if I know which point you mean - could you describe it further?
SDSS has it as a #star.
Not as far as I know, although it looks like a cool game.
Blank fields should be classified as "star or artifact" in the first question. A #blank hashtag would be helpful, but not required.
The simulations do track metals (including oxygen) and photoionization state, so it might be possible. Good question for the Illustris team.
Wow, that's a bright one. HD 206660 - 7th magnitude.
I agree, Peter - there are loads of potential galaxies that I'd think were voorwerpjes if I saw them in real data!
(@wpmaksym is one of our science colleagues, btw - we should add a tag for him).
And yet Illustris insists it's a galaxy with Petrosian radius 3.898 kpc. 😃
Blue should indicate regions of star formation; if you click through to Examine, we see that this has SFR = 1.7 solar masses per year.
One of the reasons I'm looking forward to a new "overlapping" category in the classification interface. 😃
It's a beautiful pair!
It's a star in the Milky Way. http://skyserver.sdss.org/dr8/en/tools/explore/obj.asp?id=1237678832688496740
It's a very red object, and brightest in i and z-bands. Most likely a Milky Way star that's right in front of the galaxy.
That's interesting. It's definitely real; if you click on the "Galaxy Zoo examine" link above, you can see it in all five bands.
Galaxy; even a very nearby star wouldn't have that very large size and gradual fuzzy edge. The three red dots above it are probably stars.
Yes - the Petrosian radius for this object is only 1.4 arcsec, for some reason. Looks like it centered on a small subclump in the disk.
or (possibly) a SNe in the galaxy itself. It's labeled as a galaxy by the SDSS pipeline, but I'm not sure about that. Very blue color.
The horizontal dark streak is an #artifact caused by a dead pixel on the camera; isn't a real part of the galaxy.
It has a stronger disk there, but still looks like a very #flocculent spiral.
You can see the 3-color image of the galaxy here: http://skyserver.sdss.org/dr8/en/tools/explore/obj.asp?id=1237668590259535942
That's common for the u-band, which is almost in ultraviolet. The light is dominated by only a few young, hot stars, so it looks more clumpy
Lovely barred spiral.
Maybe a satellite galaxy or merging tidal tail? This is a high-redshift galaxy, so we don't have any deeper data than this Hubble image!
Looks neat. It's unlikely to be an optical jet (they're not often bright compared to the galactic disk), but may well be a real feature.
The edge-on galaxy at the top has z = 0.22, so it's likely a background galaxy much further away.
Maybe: the two bottom galaxies (center and upper right) both have photo-z = 0.08, so those might be a group.
Although in this case, the redshifts (distances) of the galaxies are both about z=0.06. So they're consistent with being a possible merger.
You can find out more about the individual galaxies if you click on "Galaxy Zoo examine" above, if you're interested.
#arachnogalaxy
Odd blue #irregular object to lower right. Dwarf irregular?
It's from part of the sky close to the plane of the Milky Way, so there are lots of stars. Check out the full field: http://goo.gl/jz43FK
And a possible merging system. Cool!
#threearmedspiral
Likely an speck of dust in the telescope, actually - not a true astronomical object. Does have an awesome shape, though.
Yep - optical image doesn't have the same color gradient. http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237654881264533514
Yes, probably - all three galaxies have very similar distances (redshifts). A good candidate for a genuine group.
Estimated distances for the galaxies are different, but could be consistent; possible that it's a merging system.
Nice - an #edgeon spiral galaxy in the middle, and a smaller (possibly separate) galaxy at the bottom.
Ou bien peut-etre une galaxie spirale, inclinee vers notre ligne de mire. Il y a une separation entre le noyau et le disque mince ...
This one's a #star, explaining the brightness and lack of features.
Yep. Overlapping galaxies would still look more symmetrical than these.
The birth of many stars - these are two galaxies in the process of merging. Different colors show different types of stars.
Where is the IR match from?
Probably a nearby star; the very bright ones tend to saturate the camera on the telescope.
Interesting - shows up in optical images, too. http://skyserver.sdss3.org/dr8/en/tools/chart/chart.asp?ra=149.89467931&dec=1.0887094
Good ID - an #irregular galaxy with very little compact star formation. Hardly shows up at all in the UV!
Likely an artifact. Very strong colors (either red, blue, or green) means it only appeared in 1/3 bands used to make this image.
These stars and galaxies are in the constellation Sextans.
Many galaxies are pretty faint in the IR. As with all galaxies, give it your best shot - we can account for uncertainty in the final data!
Probably a galaxy, but a rather dim and diffuse one (especially in the IR).
Good call on the Hubble type. It's fascinating to see how faint spiral arms can be in the infrared, compared to the SDSS images.
You can see here how strong they look in the optical: http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237648704597131557
It's a known artifact on the Hubble detector. We're still trying to come up with a good hashtag for it.
The way the light tapers toward the edge of the galaxy really makes it look like a #disk to me, actually.
The galaxy itself should be at the center - this is either an error in centering, or the galaxy has really dropped out in the IR.
Agreed - that's a neat and slightly asymmetric tidal tail toward the top.
Heading for a nice round 10^3?
I vote for a Q in the #alphabet (would need flipping)
#edgeon and an #overlap. Votes for what this should be in the GZ #alphabet? (L or 7)
Three of a kind, potentially. Interesting to look into whether these are overlaps or genuine companions.
#lightsaber
Beautiful, prototypical example of an #earlytype #elliptical.
#technicolor
#agn
Unusually #rectangular galaxy.
Bad colors - looks like an astrometric mismatch on the SDSS filters. #ornaments
#trails
#redspots
Neat galaxy!
Green pea.
Green pea type object.
Multi-armed spiral with nearby companion.
The bright red cloud to the lower left of the image is neat. It's detected in both SDSS and 2MASS in the infrared.
Looks like a bar through the center. Any spiral arms?
That's an interesting beauty. Nothing but a bar and extended tidal tails.
#satellite - first spotted by @iobstc20.
Those can be seen in links from the GZ examine page now, too.
Totally is.
The difference in brightness between the central bulge and the halo is amazing. Would like to see a map of the ages of the stars here....
That's a trainwreck of galaxies. Neat
Neat! Very likely is. Nice spot!
We might have overdone the zoom a bit on this one.
A very cool #merger indeed! Both have SDSS redshifts at z=0.127.
Totally real.
wow!
add that one to the GZ alphabet!
They're important to notice (indicate star formation), but nope - not for any of the specific questions we ask in the interface.
Illustris is only rendering galaxies within the same halo, so mergers are much more likely.
It does - that's rare to see, but it's a gorgeous example.
The green color is because two of the DECaLS bands had bad data going right through the galaxy. http://imgur.com/5tnkyhb
Interesting. It's a very low surface brightness, irregular galaxy (already identified through Galaxy Zoo SDSS). Also named LSBC D584-05.
I agree! Signs of a possible past minor merger.
Tremendous! So much more clear than in the faint SDSS image.
http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=243.72665184&dec=11.095773&scale=0.19806&width=512&height=512&opt=&query=
Wait - likely Sab.
beautiful Sa galaxy.
That is ... odd if it's an artifact. It's unusually well-structured if so. Worth looking at the raw images.
There's a definite extension to the left of the galaxy's bulge; a possible disruption or evidence of a minor merger.
That's a good call - it looks like there's a very faint bridge between the two objects.
It's definitely a star! The disc isn't real, though - it's an artifact of the detector caused by saturation from the bright light.
Neat! It's a bright star in the Milky Way - the colors are due to saturation of the CCD and leaking of energy along rows of the detector.
Likely to be a minor merger, though!
Illustris can't reproduce lensing, unfortunately: http://talk.galaxyzoo.org/#/boards/BGZ0000004/discussions/DGZ0001lon
Might be a star forming region or super cluster within the disk.
That's a good observation. I wouldn't call it another center, necessarily, but a structure within the disk that's separate from the nucleus.
for the star at bottom left, yes. galaxy looks great, though.
likely so. beautiful long #tail near the top of the smaller galaxy.
http://skyserver.sdss.org/dr9/en/tools/chart/chart.asp?ra=339.62461713&dec=-1.17100796
Yes - that looks like a lovely crowded group. Color difference between the group and galaxy at upper left is stronger in the SDSS image.
Probably - it's so thin and looks bright green, which argues for just one filter.
That's a star in the Milky Way. It's pink because it's extremely bright and saturates the detector in the other bands.
Yes - although it might be an #overlapping galaxy in the background. Good spot!
Lots of individuals classify each galaxy, so don't worry if a particular one is difficult. What did you think of this one?
#missing (not sure why it didn't render). For this or any similar ones, please classify as "star or artifact".
Yep - we're always asking you to classify just the object in the center, although you're encouraged to discuss other things on Talk!
And another example of #wrong_size
The galaxies are likely in a group, so the stars in the halos are beginning to overlap. Interesting that we don't see any disturbances yet.
An #arc, but not a gravitational #lens. See attached discussion!
I'd also suggest creating a separate discussion if you have more questions!
http://talk.galaxyzoo.org/#/boards/BGZ0000005/discussions/DGZ0000lv2
That's right. It simulates the effect of the ionized gases that signify star formation in real galaxies, though.
Yep - for example, you could check the redshifts of both galaxies and see if they match!
Always reminds me of the Zooniverse logo.
Yep. Broad Halpha line. http://dr9.sdss3.org/spectrumDetail?plateid=1266&mjd=52709&fiber=202
I'm very happy that this image is named "AGZ000bear".
Definitely. More blue than I'd expect at only 3.8 Msun/yr.
Definitely - they represent star formation in the galaxy. One important thing we're testing their distribution and whether it's realistic.
Yes - this is another example of a galaxy from the Illustris simulation.
The image was supposed to be much more zoomed in on the galaxy at the center, so you wouldn't have seen the star.
The line is horizontal because that's the direction that the individual pixels go when they're reading out the signal to the computer.
It's a line of pixels in the CCD camera that originally took the image that got saturated, because the star is so bright.
And then some! The bridge between the two galaxies is just about unbroken
Nice edge-on.
There is a bright particle there in the pure simulation image. http://www.illustris-project.org/exp/gal_obs/subfolder_070/image_262551.png
Probably an overexposed star, or maybe two.
Galaxy (the small one at the center of the image). This is a problem with the sizing.
Looks like inclined disk up close. http://imagine.legacysurvey.org/?ra=117.08312700241719&dec=18.418966218715607&zoom=14&layer=decals-dr1j
True (neat satellite). This is really more of an issue with sizing; we should have zoomed in more on the galaxy at the center.
Yep. Identifying shell galaxies using Illustris (and how they're formed in mergers) was one of the first science results of these images!
Wow - thanks for the followup, @zutopian. That's a really compact galaxy, then - only 2.5 kpc in size from its Petrosian radius.
Thanks for classifying, Cristian! I'm not sure if I know which point you mean - could you describe it further?
SDSS has it as a #star.
Not as far as I know, although it looks like a cool game.
Blank fields should be classified as "star or artifact" in the first question. A #blank hashtag would be helpful, but not required.
The simulations do track metals (including oxygen) and photoionization state, so it might be possible. Good question for the Illustris team.
Wow, that's a bright one. HD 206660 - 7th magnitude.
I agree, Peter - there are loads of potential galaxies that I'd think were voorwerpjes if I saw them in real data!
(@wpmaksym is one of our science colleagues, btw - we should add a tag for him).
And yet Illustris insists it's a galaxy with Petrosian radius 3.898 kpc. 😃
Blue should indicate regions of star formation; if you click through to Examine, we see that this has SFR = 1.7 solar masses per year.
One of the reasons I'm looking forward to a new "overlapping" category in the classification interface. 😃
It's a beautiful pair!
It's a star in the Milky Way. http://skyserver.sdss.org/dr8/en/tools/explore/obj.asp?id=1237678832688496740
It's a very red object, and brightest in i and z-bands. Most likely a Milky Way star that's right in front of the galaxy.
That's interesting. It's definitely real; if you click on the "Galaxy Zoo examine" link above, you can see it in all five bands.
Galaxy; even a very nearby star wouldn't have that very large size and gradual fuzzy edge. The three red dots above it are probably stars.
Yes - the Petrosian radius for this object is only 1.4 arcsec, for some reason. Looks like it centered on a small subclump in the disk.
or (possibly) a SNe in the galaxy itself. It's labeled as a galaxy by the SDSS pipeline, but I'm not sure about that. Very blue color.
The horizontal dark streak is an #artifact caused by a dead pixel on the camera; isn't a real part of the galaxy.
It has a stronger disk there, but still looks like a very #flocculent spiral.
You can see the 3-color image of the galaxy here: http://skyserver.sdss.org/dr8/en/tools/explore/obj.asp?id=1237668590259535942
That's common for the u-band, which is almost in ultraviolet. The light is dominated by only a few young, hot stars, so it looks more clumpy
Lovely barred spiral.
Maybe a satellite galaxy or merging tidal tail? This is a high-redshift galaxy, so we don't have any deeper data than this Hubble image!
Looks neat. It's unlikely to be an optical jet (they're not often bright compared to the galactic disk), but may well be a real feature.
The edge-on galaxy at the top has z = 0.22, so it's likely a background galaxy much further away.
Maybe: the two bottom galaxies (center and upper right) both have photo-z = 0.08, so those might be a group.
Although in this case, the redshifts (distances) of the galaxies are both about z=0.06. So they're consistent with being a possible merger.
You can find out more about the individual galaxies if you click on "Galaxy Zoo examine" above, if you're interested.
#arachnogalaxy
Odd blue #irregular object to lower right. Dwarf irregular?
It's from part of the sky close to the plane of the Milky Way, so there are lots of stars. Check out the full field: http://goo.gl/jz43FK
And a possible merging system. Cool!
#threearmedspiral
Likely an speck of dust in the telescope, actually - not a true astronomical object. Does have an awesome shape, though.
Yep - optical image doesn't have the same color gradient. http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237654881264533514
Yes, probably - all three galaxies have very similar distances (redshifts). A good candidate for a genuine group.
Estimated distances for the galaxies are different, but could be consistent; possible that it's a merging system.
Nice - an #edgeon spiral galaxy in the middle, and a smaller (possibly separate) galaxy at the bottom.
Ou bien peut-etre une galaxie spirale, inclinee vers notre ligne de mire. Il y a une separation entre le noyau et le disque mince ...
This one's a #star, explaining the brightness and lack of features.
Yep. Overlapping galaxies would still look more symmetrical than these.
The birth of many stars - these are two galaxies in the process of merging. Different colors show different types of stars.
Where is the IR match from?
Probably a nearby star; the very bright ones tend to saturate the camera on the telescope.
Interesting - shows up in optical images, too. http://skyserver.sdss3.org/dr8/en/tools/chart/chart.asp?ra=149.89467931&dec=1.0887094
Good ID - an #irregular galaxy with very little compact star formation. Hardly shows up at all in the UV!
Likely an artifact. Very strong colors (either red, blue, or green) means it only appeared in 1/3 bands used to make this image.
These stars and galaxies are in the constellation Sextans.
Many galaxies are pretty faint in the IR. As with all galaxies, give it your best shot - we can account for uncertainty in the final data!
Probably a galaxy, but a rather dim and diffuse one (especially in the IR).
Good call on the Hubble type. It's fascinating to see how faint spiral arms can be in the infrared, compared to the SDSS images.
You can see here how strong they look in the optical: http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237648704597131557
It's a known artifact on the Hubble detector. We're still trying to come up with a good hashtag for it.
The way the light tapers toward the edge of the galaxy really makes it look like a #disk to me, actually.
The galaxy itself should be at the center - this is either an error in centering, or the galaxy has really dropped out in the IR.
Agreed - that's a neat and slightly asymmetric tidal tail toward the top.
Heading for a nice round 10^3?
I vote for a Q in the #alphabet (would need flipping)
#edgeon and an #overlap. Votes for what this should be in the GZ #alphabet? (L or 7)
Three of a kind, potentially. Interesting to look into whether these are overlaps or genuine companions.
#lightsaber
Beautiful, prototypical example of an #earlytype #elliptical.
#technicolor
#agn
Unusually #rectangular galaxy.
Bad colors - looks like an astrometric mismatch on the SDSS filters. #ornaments
#trails
#redspots
Neat galaxy!
Green pea.
Green pea type object.
Multi-armed spiral with nearby companion.
The bright red cloud to the lower left of the image is neat. It's detected in both SDSS and 2MASS in the infrared.
Looks like a bar through the center. Any spiral arms?