Author Topic: Give peas a chance!  (Read 69626 times)

Rick Nowell

Re: Give peas a chance!
« Reply #510 on: February 09, 2008, 05:38:38 pm »
It's a previously uncatalogued green pea!


Wow, two in one day! I have included both in the list, which now numbers 59 with 9 no ref.
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587739408393044155
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587741533844865274

Its sort of eerie how the colour is so alike, and how the redshift is always around those
0.2-0.3 values. When they are genuine [OIII] ELGs they just fit so snugly. I wish I could
write a paper about it!

59(ed) is a good sized population- this isn't something happening by accident. Which leads me
to ask what is going on, again, to make the whole galaxy emit [OIII] in such vast amounts?

EDIT: Wow, four in one day! Two more for the list.

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587735696981426384
Reply #508 StarryNite
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587735428545380541
Reply #465 Half65.

The list is at http://www.galaxyzooforum.org/index.php?topic=3638.288
« Last Edit: February 09, 2008, 06:24:41 pm by Rick Nowell »

diaswa

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Re: Give peas a chance!
« Reply #511 on: February 10, 2008, 12:35:42 am »

Galaxy Hunters Inc

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Re: Give peas a chance!
« Reply #512 on: February 10, 2008, 01:58:14 am »
Hi guys
Is this my first real pea?
Does this fit the parameters? or do you think its a cross between a pea and a lentil. ( I.E. it's a pentil)


Dont you just hate it when you forget to post the ID number and it takes you 2 hours to work out how to find it? :-[
640586250595598336
« Last Edit: February 10, 2008, 04:37:19 am by Galaxy Hunters Inc »

Galaxy Hunters Inc

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Re: Give peas a chance!
« Reply #513 on: February 10, 2008, 03:31:24 am »
Pink peas?
DQT (Dumb Question Time)
Again are these borderline peas?
587725503946293263




starry nite

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Re: Give peas a chance!
« Reply #514 on: February 10, 2008, 12:52:14 pm »
Putting aside for a moment that anything you want to call a pea can be one, in my opinion, it's two possibles and one negative out of the last three for OIII "Peas".
diaswa's purple candidate is an AGN (active galactic nucleus), because it shows the flat line with sharp peaks, but the OII peak is higher than the OIII, and the H-alpha perhaps too tall. The H-peaks seem to be higher in "Peas" nearer to us, though, so that's less significant probably. The OII/OIII ratio in this case does not 100% rule out that it might appear green at a higher redshift owing to the recent green one that has a reversed OII/OIII ratio from the rest. Still, this one is likely a 'no'.
Galaxy Hunters Inc, the ID number is scrambled for the first one, but it's pea-like so far. I wonder if the chart isn't being affected by the overlapping orange galaxy. Care to give it a third try?
[Edit: Found it by searching by "ra, dec". http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587741490355372344 The target is actually the orange galaxy, not the green part, which has no ID. I think the chart may be a bit from both; it's not what you'd expect of a "normal" galaxy, but it's not nearly as flat as the usual "Pea" at that redshift. Hmmm. Just by the color, I do think it's a good one. But, still could be an artifact or asteroid....]
The last pair actually both have spectral charts. The one for the upper or northern galaxy is similar but with a very short OIII peak. At their redshift, pink is appropriate for OIII "Peas", but it seems from what I know so far that at a greater 'z', the bottom one might be bright green to us while the top one might be some other color or not visible at all. That said, for the chart posted above, the baseline is riding rather high even though it's flat and the H-alpha peak (far right) is a bit tall. Definitely maybe.
« Last Edit: February 10, 2008, 05:18:56 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #515 on: February 10, 2008, 02:51:54 pm »
This next one was recognized as a green "Pea" by vppmhjeeyysr, Hanny, and EricFDiaz, yet it never made its way to this thread. Chart looks right. Original post by Napoleon: http://www.galaxyzooforum.org/index.php?topic=8611.0

ra=134.48628459, dec=7.01448756, ObjId = 587732772108435832
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587732772108435832
« Last Edit: February 10, 2008, 02:54:13 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #516 on: February 10, 2008, 03:17:44 pm »
This one is a pea I've been hoping to see. Redshift z=0.1381, right around where OIII galaxies start looking green on SDSS. Posted by EricFDiaz in the QSRO thread: http://www.galaxyzooforum.org/index.php?topic=3874.msg48405#msg48405

ra=51.85074396, dec=0.8012343, ObjId = 587731513693962431
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587731513693962431
« Last Edit: February 10, 2008, 05:03:48 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #517 on: February 10, 2008, 03:26:03 pm »
A lovely lilac pea from trevor faller in the QSRO thread: http://www.galaxyzooforum.org/index.php?topic=3874.msg48672#msg48672

ra=213.32905097, dec=28.12011158, ObjId = 587739607564550210
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587739607564550210
« Last Edit: February 10, 2008, 05:07:11 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #518 on: February 10, 2008, 03:32:42 pm »
A gray pea, perhaps boiled too long, from the QSRO thread by jlowe: http://www.galaxyzooforum.org/index.php?topic=3874.msg48740#msg48740
Seems like as redshift increases, OIII "Peas" may go from pink/purple to gray/white before turning green.

ra=247.11475338, dec=30.91491631, ObjId = 588018253224935626
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588018253224935626
« Last Edit: February 10, 2008, 05:07:24 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #519 on: February 10, 2008, 03:41:29 pm »
Science isn't supposed to fear things that don't fit in with theories, so here's one that's confusing. At z=0.2220, it's solidly in the range where an OIII galaxy would be green judging by all the other examples, yet it looks bluish-white. Posted by Nightwatch: http://www.galaxyzooforum.org/index.php?topic=8925.0

ra=223.60253947, dec=3.99033128, ObjId = 587726101487812854
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587726101487812854
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starry nite

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Re: Give peas a chance!
« Reply #520 on: February 10, 2008, 03:47:51 pm »
And a purple pea from Stegra: http://www.galaxyzooforum.org/index.php?topic=5545.0

ra=167.02727709, dec=60.57181823, ObjId = 588009370687438983
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588009370687438983
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starry nite

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Re: Give peas a chance!
« Reply #521 on: February 10, 2008, 04:42:51 pm »
Just updated the list of IDs/redshifts/colors: http://www.galaxyzooforum.org/index.php?topic=3638.msg105744#msg105744
For size reasons, I've had to separate possible peas from the ones with good charts. Here they are, not counting the most recent candidates above:

Questionable because chart is cut off:                                                          z-Shift     Color     
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588010877687431223 <<< z=0.0055  White+Blue       
       Oval, Fuzzy, Core, Spots
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587729385545990272 <<< z=0.0072  Blue-Gray~
       Irregular
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587731679581634656 <<< z=0.0240  Blue
       Oval, Fuzzy

At some point, I'll put together a list of the best candidates without spectral charts. Unless someone gets around to it first, of course. I don't want to deny anyone their fun!
« Last Edit: February 10, 2008, 06:56:41 pm by starry nite »
Good news everyone!

starry nite

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Re: Give peas a chance!
« Reply #522 on: February 10, 2008, 07:04:45 pm »
This luscious red grape was posted by Dancw39 in the Quasars thread: http://www.galaxyzooforum.org/index.php?topic=942.msg99911#msg99911

ra=189.51566071, dec=46.30559879, ObjId = 588017109686943854
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588017109686943854
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starry nite

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Re: Give peas a chance!
« Reply #523 on: February 10, 2008, 07:15:28 pm »
Another wayward green! From the Quasars thread by GES: http://www.galaxyzooforum.org/index.php?topic=942.msg72843#msg72843

ra=220.88145239, dec=39.35095426, ObjId = 588017605233016935
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588017605233016935
« Last Edit: February 11, 2008, 02:37:47 pm by starry nite »
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starry nite

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Re: Give peas a chance!
« Reply #524 on: February 11, 2008, 06:20:13 am »
More mud in the water. An OIII "Pea" that "should" be green but isn't. From Thibault in the Quasars thread: http://www.galaxyzooforum.org/index.php?topic=942.msg63588#msg63588

ra=160.47651738, dec=48.12215656, ObjId = 587732484353294434
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587732484353294434
« Last Edit: February 11, 2008, 02:38:00 pm by starry nite »
Good news everyone!