Author Topic: Peas Project  (Read 119654 times)

Rick Nowell

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Re: Peas Project
« Reply #15 on: July 09, 2008, 09:00:13 am »
Is this enough green ones?  I'd forgotten about this list...

Celebratory list; 106 and counting!

Listing For Green(ish) [OIII] ELGs up to 23/03/08(!). Apparently they are actually red.
r' = detector "sees" actual red.    Screen display as green

Galaxies showing flat spectra except extreme peaks at OII-III, ionised oxygen.
Redshift range 0.144 - 0.354. The majority are found between 0.2 - 0.3, which is about 3-4 billion years ago.
Typical Spectrum:   http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587724199349387411   
Numerical Sorting of 106 galaxies, 14 with no NED ref.
I wonder if the "pea selection" yields a sample of interesting objects....

      587724197202428120
      587724199349387411
      587724233716596882
      587724234248552589
      587724240158589061
      587724240687792239
      587724241767825591
      587725040100311301
      587725503949177426
      587725550133772480
      587725577499443655
      587725591460118965
      587725775069643261
      587725817496141992
      587726014549328120
      587726031184330774
      587726032255189192
      587726101492924832
      587726101493579972
      587727177929588906
      587727179006148758
      587727180076744832
      587727214417871520
      587728669342695728
      587728917372993708
      587728947977453768
      587729155208249539
      587729155743875234
      587729777439801619
      587729777446945029
      587729970180522426
      587731870165893326
      587731892187037787
      587732134315425958
      587732152033345685 
      587732152555864324
      587732153639829774
      587732156853846376
      587732578830713622
      587732578845786234
      587732702852743474
      587732772108435832
      587733399717413034
      587734691964780796
      587735042543386850
      587735343188934969
      587735428545380541
      587735696443506837
      587735696981426384
      587735696987717870
      587736803471261841
      587736915687375248
      587736915687964980
      587736962921857252
      587736976351822098  no ref...
      587738410863493299              z=0.144
      587738570853974145
      587739098597687419
      587739114708402325
      587739153352229578
      587739158190948542
      587739294549541044  no ref...
      587739305286697134
      587739377230610665
      587739406242742472
      587739406764540109
      587739408393044155
      587739505544528023
      587739506616631548  no ref...
      587739608086741136
      587739646210998382
      587739652107600089  no ref...
      587739721387409964  no ref...
      587739815320879621  no ref...  z=0.354
      587741421099286852  no ref...
      587741422173552932  no ref...
      587741490367889543  no ref...
      587741532770074773  no ref...
      587741533844865274  no ref...
      587741721214714062  no ref...
      587742014876745993  no ref...
      587742062133575945  no ref...
      588007003643773193
      588007005778411734
      588009365864972517
      588010137337200805
      588010358532800668
      588010360138367359
      588011218605179021
      588015507683344558
      588015509290877040
      588016891174912170
      588017114518257872
      588017570848768137
      588017605233016935
      588017606290178168
      588017720638570644
      588017721177800810
      588017721724502213
      588018054573457629
      588298663038943488
      588848898856648955
      588848899356230091
      588848899919446344
      588848899937141059
      588848900980015266 
      588848901003542800    no.106


zookeeperKevin

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Re: Peas Project
« Reply #16 on: July 09, 2008, 12:54:07 pm »
Just to bring you up-to-speed on the whole [OIII] saga. We sort of stopped searching for just green ones quite awhile back...

Hi Rick,

That's the point of this thread -- we are trying to collect just the green ones.

zookeeperKevin

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Re: Peas Project
« Reply #17 on: July 09, 2008, 01:04:18 pm »
Hi Rick, lahiro et al... could you help Carie create a list of the green peas only? Many different astrophysical objects can emit in [OIII], but the green peas are a particular class that I think hasn't been studied before....

Rick Nowell

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Re: Peas Project
« Reply #18 on: July 09, 2008, 05:44:57 pm »
Hi Rick, lahiro et al... could you help Carie create a list of the green peas only?
Yes, I guess I got carried away...I have put a list of green 106 [OIII] galaxies and I will thin the others
out. Excuse me, but I am very tired at the mo'.

Rick Nowell

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Re: Peas Project
« Reply #19 on: July 09, 2008, 06:01:31 pm »
This pea has the largest redshift for 'greens', which is z=0.354. The continuum is fairly
flat, and there is [NeV] showing.
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587739815320879621



Rick Nowell

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Re: Peas Project
« Reply #20 on: July 09, 2008, 06:15:08 pm »
This has the smallest redshift for greens yet come across, z=0.144.

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587738410863493299


ccardamone

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Re: Peas Project
« Reply #21 on: July 10, 2008, 02:11:13 am »
Thanks!  These are great and exactly what we're looking for.


laihro

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Re: Peas Project
« Reply #22 on: July 10, 2008, 05:58:25 am »
Hi Carie,

and a "welcome to the pea zone" from me too.  :)

We're looking for galaxies that  are very green, compact and if you look at the spectrum they have an big bright OIII line.  It's this OIII line in the r-band that makes them look so green, so they should be at a redshift z > 0.15 and z < 0.45. 
May I ask, why you are putting an upper limit on the redshift? I mean, it's not like any important emission line becomes invisible in the spectrum at z>0.45. [OI] fades out at this point while [H-alpha] is long gone then. There is no green OIII object from z>0.38 anyway. OIII dominated objects appear red in the range 0.38<z<0.65, see the color survey and the color discussion. Never mind, I'm sure there is a good reason for that upper redshift limit. I just would like to hear it.  ;)

I'd rather get a duplicate from the 'give peas a chance' thread than miss one all together.
To deal with duplicates, I would advise to create an object database. You can then employ SQL, to sort out the duplicates. Maybe it would also be helpful to specify the data you want to accompany a proposed object e.g. objId, specObjID, redshift, zConf, references in papers etc. Sorry, if I am carrying owls to athens here. You can contact me, if there is something on which I can help you.

I think Ricks green object list and my top 750 classic pea list are a good starting point. I could also create within minutes a list that is suited to your special requirements. But if I have learned anything from ElisabethB then that all I can create automatically is far from complete. This is meant as an encouragement for all pea hunters out there to keep searching!
« Last Edit: July 10, 2008, 06:09:27 am by laihro »
IMHO. And I don't have a clue ...

Rick Nowell

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« Last Edit: July 11, 2008, 10:21:47 am by Rick Nowell »



fluffyporcupine

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Re: Peas Project
« Reply #26 on: July 10, 2008, 12:47:27 pm »
not sur eif this belongs here, but here it is anyway :D

587733412059676767


laihro

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Re: Peas Project
« Reply #27 on: July 10, 2008, 01:11:18 pm »
not sur eif this belongs here, but here it is anyway :D
Let me be the first one to say: "Distant merger candidate!".  :) Excellent find!
IMHO. And I don't have a clue ...

fluffyporcupine

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Re: Peas Project
« Reply #28 on: July 10, 2008, 01:13:34 pm »
not sur eif this belongs here, but here it is anyway :D
Let me be the first one to say: "Distant merger candidate!".  :) Excellent find!
Thanks laihro :)

Rick Nowell

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Re: Peas Project
« Reply #29 on: July 10, 2008, 01:28:50 pm »
Hiya Fluffy? I hope all is well with your engineering. Remember this thread? It was you
who first explained where doubly-ionised oxygen was in the spectrum. Cool.

Posted by Nightwatch,   Dec. 10.
What Is This Green Colored Thingy?
http://www.galaxyzooforum.org/index.php?topic=8926