80 Peas.
CREDITS: SDSS, Rick Nowell.
On page 16 of Carrie's paper on the Peas is "Table 4. Properties of Pea Star-Forming Galaxies". There follows a list of 80 objects with their Positions, Redshift, OIII Equivalent Width, Xray Luminosity, Rate of Star-formation, Metallicity and Stellar Mass. The list of the 80 galaxies and their links to SDSS is here:
Peas_ListThere are some remarkable figures among these. Over 3.7 billion light years distant is
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587728906099687546
which forms around 58 Suns a year. If we compare that rate of star-forming with our own galaxy The Milky Way (which forms around 3 Suns a year), we can see that this particular galaxy 587...7546 has a relative star forming rate over 1900 times that of The Milky Way! taking into account their differences in Mass.
"Equivalent width" quoting zookeeper Kevin, "is a slightly odd but very robust way to measure the amount of luminosity in an emission (or absorption line). You basically compute the amount of luminosity in the line and then look at the continuum next to it and see how far in wavelength (Angstroms) you have to go until you've got the equivalent in luminosity...An EW of 1000 A is HUUUUUUUUUUUUUUUGE!"
When looking at Table 4, we find the largest EW is 2388 A.
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587738410863493299
This is just short of two billion light years distant and forms around 8 Suns a year. When clicking on the spectrum in SDSS, we can see just how
flat the continuum is and how large the OIII spikes are.
The furthest away is
http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587732134315425958
This is over 4.7 billion light years away, forms around 23 Suns every year and has a EW of 554 Angstroms
There are three objects that form more than 20 Suns a year and have EWs of more than 1000 Angstroms:
587726032253419628587729777446945029587738371672178952http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587729777446945029 happens to be very emerald green- beautiful!
Of the 251 objects that the paper started with (a figure arived at by using colour selection), after the Spectral Diagnostics there were 103 Narrow-Line Peas and 9 Seyfert Galaxies (8 narrowline and one broad line). At this point, 139 objects had been left out of the final analysis, due to a combination of Sky Lines on Spectra and not having a signal-to-noise ratio that was greater than 3. (Best explained by Scientists! (Pg4)). Further analysis "revealed that the majority of the objects are star forming". But, of the 103 that were left after the Spectral Diagnostics, 10 were found to have Active Galactic Nuclei and 13 were found to be transition objects.
Thus, a final list of 80 (Table4) was created. These I have combined into the above montage. Using the list here
Peas_List I put them in a downwards left-to-right order. The resolution is below that of SDSS' capabilities, as Peas are approximately no more than 10-15 kpc across, so we can't see much, except that all seem to be irregular in form- some look like Mergers? Also, from this picture, we can see that while the majority are certainly green, some are not. Indeed a couple of them are unrecognisable as Peas, but after consultation with Carrie, she assures me that these fit the criteria.
It's nice to be able to see them altogether...
http://www.galaxyzooforum.org/index.php?topic=275809.0 -Galaxy Zoo library abstract.
http://www.galaxyzooforum.org/index.php?topic=275810.0 -Discussion.
http://xxx.lanl.gov/abs/0907.4155 -Carrie's paper online.
http://www.dailyindia.com/show/325312.phphttp://story.chinanationalnews.com/index.php/ct/9/cid/89d96798a39564bd/id/524240/cs/1/http://www.zimtownship.com/index.php?PageT=PressArchive&act=ReadArticle&ID=180253http://www.iran-daily.com/1388/3460/html/science.htmhttp://www.popmech.ru/article/5729-zelenyie-goroshinyi-galaktik/http://www.excite.co.jp/News/column/20090729/Nationalgeo_2009072903.htmlhttp://www.boletimsupernovas.com.br/edicao/524/noticia/2553/BSN_cacadores-do-galaxy-zoo-ajudam-os-astronomos-a-descobrir-raras-galaxias.htm etc. etc.
