Peas of a Different Colour
-
by williamaskew
I wanted to start a thread for any Peas you come across to compare the DECaLS with the SDSS images. Please include spectra.
I'll start with the first one I found (to the left). Ah but Rick beat me to it!PLEASE USE IMAGE FORMAT OF 200X200 for the squares and 360x240 (approx) for the spectra.
Ghost Sheep explains how belowTO AVOID OVERLAPS HERE'S A TIP: "Please check if the candidate pea galaxy is already in this "Peas of Different Colour" discussion. If it is you can see it headlined under: " Discussions mentioning this" on the star' s page bottom right."
pg 1:
AGZ000am9n
AGZ000aqma
AGZ000apzepg 2:
AGZ000aq2k
AGZ000avrp
AGZ000b88x
AGZ000ayu1
AGZ000b7zmPg 3:
AGZ000aq81
AGZ000ayv2
AGZ000aqg8
AGZ000aqaaPg 4:
AGZ000b875
AGZ000bavo
AGZ000AQ2K
AGZ000ayuz
AGZ000aykb
AGZ000aq13Pg 5:
AGZ000apza
AGZ000ank8
AGZ000aqhq
AGZ000b12h
AGZ000b12v
AGZ000b3iu
AGZ000ayop
AGZ000ay11Pg 6:
AGZ000ay1n
AGZ000ayvf
AGZ000auv0
AGZ000ay28
AGZ000bdvn
AGZ000ayf4
AGZ000aq4d
AGZ000aych
AGZ000b12kPg 7:
AGZ000ayj9
AGZ000aqfe
AGZ000aqbk
AGZ000av3t
AGZ000bf9oPG 8:
AGZ000aq81
AGZ000ayv2
AGZ000aqg8
AGZ000aqaaPg 9:
AGZ000ba8p
AGZ000bfaj
AGZ000atbaPg 10:
AGZ000bfrw
AGZ000avpv
AGZ000ay64
AGZ000bcbnPosted
-
by bluemagi
I have a list of 87 Pea's. Galaxy Zoo numbers only. If your interested in these let me know.
Posted
-
by Rick_Nowell
I'll start with an easy one! What would be very handy is a way of seeing the DECaLS image as a thumbnail,
as in the SDSS picture. Otherwise the posts could be too large. So, if anyone knows how to do minimise DECaLS? Or indeed the SDSS spectra, which is way too large! That would be lovely! Thumbs of DECaLS (now solved), SDSS pic and SDSS spectra (now solved). Perhaps always use DR12 refs? I'm using 200x200 same as SDSS. Spectrum just add =360x240 after the full address.http://skyserver.sdss.org/public/en/tools/explore/summary.aspx?id=1237663543148740698 posted by William.
http://www.galaxyzoo.org/#/examine/AGZ000am9n
http://skyserver.sdss.org/dr12/en/get/SpecById.ashx?id=422244936562272256
Posted
-
I recently started using this:
When adding an image, just add '=300x' or '=300x300' directly behind jpg
Or for example '=150x' for thumbnails, using 150x150 might skew a non-square image though
Posted
-
by Rick_Nowell in response to Ghost_Sheep_SWR's comment.
Sweet! I'm using '200x200', which is the same size as the SDSS thumb.
Posted
-
by Budgieye moderator in response to Ghost_Sheep_SWR's comment.
Thank you by Ghost_Sheep_SWR, that is useful to know.
I have been using
IMG SRC="" WIDTH="600" (enclose in pointy brackets, put image inbetween quotes, change size to suit)
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?_ga=1.150949558.1480981649.1447195595#/subjects/AGZ000aqma
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=1.7376294928984655&dec=0.8572152522411014
Posted
-
by Abe_Hoekstra
I am glad you are able to post images now, Billy 😃. I will see what I can do to help you post more in one comment.
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000apze
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=342.74698359000286&dec=0.00910746015720354
Posted
-
by Abe_Hoekstra
Ah, you worked it out 😃. Great, Billy 😃.
Posted
-
by williamaskew
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=345.5416293914924&dec=0.8275053533806594
http://talk.galaxyzoo.org/#/subjects/AGZ000aq2k
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000avrp
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=326.248275268774&dec=-0.19451211973053256
Posted
-
by Rick_Nowell
I bet this is the only project in the world matching DECaLS and SDSS Peas.
Posted
-
by Ghost_Sheep_SWR in response to Budgieye's comment.
I think i actually found the trick buried here in the GZ forum in a discussion on pic size, so thanks right back at you 😃
Can't remember where so i can't give credits to the right person unfortunately.....
Any chance you can explain how to stitch images together, like you did here?;
Tried everything to no avail
Posted
-
by bluemagi
Yes, I can read the spectrums and I also can see them by sight they have a distinct look to me. The spectrums can very sightly but they are peas. If you only want the ones like the spectrum above. You'll have to go through them all to find only those. The main thing is OIII must be around 5008 (ionized oxygen) and Ha must also be high. Good luck. Its interesting to see when you finish!
Posted
-
by Rick_Nowell
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237662500007248142 (J160810)
This Pea has the highest [OIII] to [OII] ratio in the whole SDSS database. The ratio is near 30. These are very interesting galaxies, Sorry I don't have a DECaLS image, but the SDSS Spectrum is very pure and might well serve as a good example to decide what is and isn't a possible Pea.
Posted
-
This one also looks like it has a really high ratio, don't know if its considered a pea though, at least due to low redshift ( and slight rise from right to 4000 )
Posted
-
by williamaskew in response to Ghost_Sheep_SWR's comment.
http://talk.galaxyzoo.org/?_ga=1.173983011.1480981649.1447195595#/subjects/AGZ000b88x
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=137.05684698431136&dec=26.70088891569981
Posted
-
by williamaskew in response to Ghost_Sheep_SWR's comment.
http://talk.galaxyzoo.org/?_ga=1.173983011.1480981649.1447195595#/subjects/AGZ000ayu1
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=327.6244653967181&dec=0.5336764664621496
Posted
-
by williamaskew in response to Ghost_Sheep_SWR's comment.
http://talk.galaxyzoo.org/?_ga=1.173983011.1480981649.1447195595#/subjects/AGZ000b7zm
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=134.0733755766866&dec=26.67020738213491
Posted
-
by Abe_Hoekstra
Billy, did you move the images to another album on Photobucket? If so, the images here disappear.
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?&_ga=1.180356647.1480981649.1447195595#/subjects/AGZ000aynd
Posted
-
Indeed many pictures have vanished.
And when using =200x200 and =360x240 i think =200x and =360x should do the trick also, and then you're sure the pictures keep their original ratio's
Posted
-
by Rick_Nowell
One can find Peas by using co-ordinates, but it's a bit hit-and-miss.
At the beginning of this thread, there's the example:
http://skyserver.sdss.org/public/en/tools/explore/summary.aspx?id=1237663543148740698
which has the GZ number:
http://www.galaxyzoo.org/#/examine/AGZ000am9n
If a person uses a DECaLS web address, then using something like:
http://legacysurvey.org/viewer/?ra=336.29222&dec=-0.19803&zoom=16&layer=decals-dr2
i.e. using the ra and dec from the SDSS page, at least produces a DR2 image, which perhaps can be edited to an appropriate size and stored elsewhere for access (like photobucket). It is hit-and-miss though.
An SDSS image: http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237667442969149616
gives a weird image: http://legacysurvey.org/viewer/?ra=180.068&dec=27.333&zoom=16&layer=decals-dr2
but looks to be in the right place, but why is it just red?
Posted
-
by Abe_Hoekstra
I came across this one, I don't know if it is a pea:
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
It looks like a (Green) Pea galaxy; notice ratio of [OIII] (5007) to [OII] (3727), and the ratio of [OIII] (4959) to Hydrogen Beta (4860), to the left of [OIII], using un-redshifted wavelengths. These seem to be ratios the professionals are after. Also, notice an almost total lack of 'noise', which might indicate AGNs, which are not Peas. Peas are purely star-forming.
https://en.wikipedia.org/wiki/Pea_galaxy
Posted
-
by Abe_Hoekstra
Thanks, Rick, I am trying to learn about and recognize these peas.
Posted
-
by Ghost_Sheep_SWR in response to Rick_Nowell's comment.
For DECaLS DR2, my guess is its still being 'processed', so the order bands should follow later on
And from DECaLS (DR1) you can access the object in SDSS DR12 by pressing its z value from 'spectra', if it has one
Posted
-
by Abe_Hoekstra
Posted
-
by Abe_Hoekstra
All images are back, Billy 😃.
Posted
-
Aaaah, here it is, kudos to DZM, link posted by Vrooje in GZ Help forum;
https://www.zooniverse.org/talk/14/8509/?comment=16025&page=1
Also a full markdown thread available on Zooniverse with links
Posted
-
by Rick_Nowell
Two Peas, one known the other likely, found using the co-ordinates method as in earlier post:
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237648703509692496
http://legacysurvey.org/viewer/?ra=197.88037&dec=-0.64567&zoom=16&layer=decals-dr2
Found in GPs thread.
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?ra=142.326640&dec=0.47034731
http://legacysurvey.org/viewer/?ra=142.326640&dec=0.47034731&zoom=16&layer=decals-dr2
First posted by C_Cld in Blue Compact Dwarf thread.
Posted
-
Scroll down and have fun digging in, page 185 😃
Peas Peas Peas!
http://www.galaxyzooforum.org/index.php?topic=3638.2760
Posted
-
by Rick_Nowell
The same likely Pea using the GZ_DECaLS, the DECaLS browser and the SDSS plus spectrum. Four sources of info!
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237663462604996817
http://www.galaxyzoo.org/#/examine/AGZ000aq2k
http://legacysurvey.org/viewer/?ra=345.54162&dec=0.82752&zoom=16&layer=decals-dr2
The image from the DECaLS browser uses the co-ordinates from the SDSS image found separately. Posted on this thread by William and also found in the GPs thread.
Posted
-
by Abe_Hoekstra
Being new to the material of peas I have got a question.
Why do we have to import the material of the known peas in the forum over here? Those peas are known after all, and the science team know about them. Wouldn't it be better to concentrate on those we now find in the DECaLS images? Maybe we'll find a few unknown ones for the science team. Imho that is much more constructive than rehash old material.
Cheers,
AbePosted
-
by williamaskew
http://talk.galaxyzoo.org/?_ga=1.240593411.1480981649.1447195595#/subjects/AGZ000ayuz
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=325.1554887940464&dec=1.1896578851354243
Posted
-
by Abe_Hoekstra
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=343.201592919857&dec=-0.5468260523019627
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
I agree that primary material for GPs should be from this Talk site: The 3 found using the co-ordinate method are all on this Talk in the GP thread and the Blue Compact Dwarf thread. Known GPs are useful though to provide examples and, hey! this has yet to become anything more than a GZ Talk project.
Someone needs to start making a list. Billy seems like a good choice!
As an aside, Yuri Izotov found 803 Luminous Compact Galaxies (his GPs) between redshifts 0.02 and 0.63 using the entire SDSS DR7 database. DECaLS and SDSS do overlap, but not entirely.
Posted
-
by Rick_Nowell
http://talk.galaxyzoo.org/#/subjects/AGZ000ank8 first posted by Ghost_Sheep_SWR
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=346.7656547669482&dec=1.2197729284013505
Posted
-
by Ghost_Sheep_SWR in response to Rick_Nowell's comment.
Additional Pea's from DECaLS, non-SDSS overlap would make sense here. Only problem is to be sure you'd need a spectrum, and these can only be obtained from SDSS, not DECaLS...
Green Pea?
Posted
-
by Abe_Hoekstra
Posted
-
by Abe_Hoekstra
Flagged by john.phillip
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=330.5028667508164&dec=-1.202421984526019
Posted
-
by Rick_Nowell
A likely Pea first posted on this Talk by Lynjac, then co-ordinated into DECaLS DR2.
http://talk.galaxyzoo.org/#/subjects/AGZ00065i9
http://cas.sdss.org/dr9/en/tools/explore/obj.asp?ra=249.512098&dec=26.452713
http://legacysurvey.org/viewer/?ra=249.51214023&dec=26.45279756&zoom=16&layer=decals-dr2
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bdvn
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=324.4108336506916&dec=7.775869975899105
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000ayf4
Posted
-
by Abe_Hoekstra
No starburst.
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=353.9930206728094&dec=1.2496762157143695
Posted
-
by Abe_Hoekstra
No starburst.
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=338.0601425312463&dec=1.0701540767702384
Posted
-
by Abe_Hoekstra
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=357.69142571971344&dec=0.27155263886243636
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000aqbk
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000av3t
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=320.1080967754512&dec=-0.9739502222257383
Posted
-
by Rick_Nowell
Eight Seyfert 2 galaxies were found in the original GP study, as these have high excitation levels. They were however excluded as they are not pure starformers, but have AGN. The wavelengths that can indicate Seyferts, and more generally AGNs, are:
[NeV] (3426), He II (4686), [OI] (6300), and [SII] (6717), (6731).
Generally, as GPs get further away, there is more 'noise' in the spectra. Judging what is noise caused by distance, or caused by AGNs, is pretty arbitrary, but a good guideline might be to check distance- if the redshift is low but there's a lot of noise then the object probably has an AGN. Some spectra here look borderline: Perhaps check against known GPs?
Also, further to the ratios I mentioned earlier in the thread (pg3) that are particularly important: A ratio of more than >5 between [OIII] (5007) to [OII] (3727); more than >1 for [OIII] (4959) to Hydrogen Beta (4860). If the [OII] (3727) is bigger than the [OIII] (5007), junk it.
The spectrum of the GP recently flagged as 'proving' reionisation is (note redshift and noise):
Note also the primary classification of the above galaxy, found very near the top of SDSS DR12 Explorer as TYPE=STAR - a classic sign of a GP and a way in which they were first identified in December 2007. This is a spectral fibre anomaly.
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237671262812897597
In the ongoing Hubble observations, 4 out of the 13 have this TYPE=STAR anomaly. They are:
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237667143932903771
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237648703509692496
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237652900228628592
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237662500007248142
Quoting from Wikipedia: "Out of the 251 of the original GP sample that were identified by the SDSS spectroscopic pipeline as having galaxy spectra, only 7 were targeted by the SDSS spectral fibre allocation as galaxies i.e. 244 were not."
https://en.wikipedia.org/wiki/Seyfert_galaxy
Posted
-
by Rick_Nowell
I think we have a interesting GP, possibly new, posted by William in this thread on Page 6. Of course it could be one of the 803 LCGs, but only Yuri Izotov has that list to compare against- it was never published. A ref is usually given in NED though to LCGs. LCGs used DR7 and this DR12.
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237678846645437735
http://talk.galaxyzoo.org/#/subjects/AGZ000bdvn
http://dr12.sdss3.org/spectrumDetail?mjd=55451&fiber=847&plateid=4088
It has a TYPE=STAR anomaly (see above), the right spectrum, if a bit noisy, and has no refs in NED apart from GALEX, where its flagged as a UVsource. Also, the ratios mentioned above seem exciting, by eye. BOSS classes it as Galaxy.
Posted
-
by williamaskew in response to Rick_Nowell's comment.
well thats good news Rick. Thanks for checking up on that and much thanks for the keen advice it is very useful. this is a good thread. I hope we get more volunteers posting now they know what to look for. Aces!
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bf9o
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=129.81812217684856&dec=26.17877176094967
Posted
-
by Rick_Nowell in response to williamaskew's comment.
Really, the TYPE=STAR anomaly (GPs are galaxies!) is a very good general diagnostic. When I had my first GP hunt, the citeria I used were: Green, obviously, a huge [OIII] spike, a flat continuum in the spectra and last but not least TYPE=STAR. The system first sees it as very compact, or small, very luminous object, so flags it as a star. Then when the system has a second look, it decides the object is a galaxy. Dyslexic software.
That's not to say all GPs have TYPE=STAR, but out of the initial 251 GPs, 244 had TYPE=STAR. Perhaps I should have mentioned that earlier. Don't rely on finding many though...
https://en.wikipedia.org/wiki/Pea_galaxy
Posted
-
by Abe_Hoekstra
Thanks for the helpful information, Rick. So the ratio between OIII and OII has to be at least 5 or larger. Does that only count for Green Peas or the others, like purple and blue peas too? If so a number of possible peas I posted in this thread may not be peas at all.
(I checked my entries in this discussion: judging by the ratio's then this is the only real pea I posted: http://talk.galaxyzoo.org/#/subjects/AGZ000bfew)
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?_ga=1.177016229.1480981649.1447195595#/subjects/AGZ000aq81
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=350.12525394955645&dec=1.1572590426055724
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
The ratio of [OIII] to [OII] being equal or more than 5 comes from Yuri Izotov's Nature paper: "A high O32=OIII/OII flux ratio of 5, which may indicate the presence of density-bounded regions". So these are ratios which the most extreme GPs have. Also in that paper, it says; "The emission-line ratio of OIII to Hydrogen beta the same or more than 1 to include galaxies with high excitation regions".
So far, I think the two galaxies William has posted that show signs of being GPs are the only ones to take forward. However, some of the purple ones are also amazingly excited. What's very interesting is that the redshifts are very low and that they are in DECaLS!
Please post what you think should be in here, bearing in mind what is in this thread. GPs are rare, but to start finding them in DECaLS is exciting news.
Posted
-
by williamaskew
not the highest ratios in the nest
http://talk.galaxyzoo.org/#/subjects/AGZ000aqaa
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=352.3838282848949&dec=0.5741608691161733
Posted
-
by Rick_Nowell in response to williamaskew's comment.
"not the highest ratios in the nest". A nest of Peas? A GP nest?
Posted
-
by williamaskew in response to Rick_Nowell's comment.
exactly!
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bf9m
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=128.77545047318324&dec=26.345091268262447
Posted
-
by Rick_Nowell
Well, it looks like we have, thanks to William, 3 new GPs. There are possibly 30-40,000 GPs in the local Universe, but very many of them don't have spectra. So, finding new, un-referenced contenders is always cool.
37735
54011
80896They don't look like much; no huge relativistic jets or amazing mergers. So small the SDSS spectral fibre allocation thinks they're stars. These GPs spectra aren't as excited as some seen, but this might be a 'line-of-sight' effect, as discussed in a study by Anne Jaskot and Sally Oey when investigating neutral gas geometry. A vague analogy is to imagine standing in front of, say, a searchlight. If looked at straight on, then the beam would be blindingly intense, but if you stepped away and faced the beam side-on, then it would be visible but not so intense. The beam of light would show the same make-up if measured in a spectrum, only it wouldn't be so strong when seen facing the side.
The same with GPs: If we look at them 'full on', we might see the most intense streams of radiation, but if the galaxy is facing a different way, we might still see the same spectrum, just at not such a high level. Because GPs are compact, this effect can be measured when comparing GPs with similar properties and has been proven.
Also noticeable are the low redshifts, which cover a range of 500 million to 1 billion light years. That's closer to us than any other referenced GPs. The environments the GPs are in are sparse- an area of ongoing research. In the original GP study, GPs were found to be in environments less than 2/3 of the average space density. Indeed, looking at the GPs in DECaLS, they are all on their own. Does the absence of any other nearby galaxies allow GPs to be as active as they are?
========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237678846645437735
http://legacysurvey.org/viewer/?ra=324.41082&dec=7.77585&zoom=16&layer=decals-dr2
========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237664093973054011
http://legacysurvey.org/viewer/?ra=129.81805432&dec=26.17875918&zoom=16&layer=decals-dr2
========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237661124539580896
http://legacysurvey.org/viewer/?ra=128.77549294&dec=26.34505215&zoom=16&layer=decals-dr2
========
https://en.wikipedia.org/wiki/Pea_galaxy
Posted
-
by Abe_Hoekstra
Billy, congrats, three new peas ! 😃. May you find many more 😃.
How about this one Rick: http://talk.galaxyzoo.org/#/boards/BGZ0000004/discussions/DGZ0001tly
Is it a pea? And is it known?
Posted earlier on page 3
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
It's certainly a very special object with a spectrum like that. Extreme! 700 million light years away and almost no noise. Huge ratios. Starburst is, perhaps, not entirely galaxy-wide. No NED refs. No [NeV]. Amazing!
It's like these ones from the current Hubble program 14080, which are also 'nearby':
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237659897247760394 (J173501)
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237660027202699446 (J021307)
At the end of the day, it's the professionals who decide. All people can do is present them with a likely selection and see what happens. This must be a GP, surely?
http://www.stsci.edu/hst/phase2-public/14080.pro
Posted
-
by Abe_Hoekstra
Thanks Rick, so we might have at least four new peas 😃. Billy, thank you for making this a great thread!
Posted
-
by Abe_Hoekstra
This one looks good.
Also flagged by bluemagi
http://talk.galaxyzoo.org/#/subjects/AGZ000ba8p
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=139.96220979840788&dec=20.24099445025884
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=139.96220979840788&dec=20.24099445025884 has four refs in NED, including one from GZ.
Posted
-
by Abe_Hoekstra in response to Rick_Nowell's comment.
Thanks, Rick 😃.
Posted
-
by williamaskew
Thanks to Abe for helping me find spectra on this one
http://talk.galaxyzoo.org/#/subjects/AGZ000bfaj
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=123.26260475656133&dec=24.483180723538865
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?ra=08:13:03.02&dec=+24:28:59.44
INTERACTIVE: http://dr12.sdss3.org/spectrumDetail?plateid=4463&mjd=55868&fiber=204
Posted
-
by Abe_Hoekstra
Wow, that is a great one, Billy 😃. And thanks, it was my pleasure 😃.
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bfrw
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=140.89837126971005&dec=29.272245894645767
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000avpv
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=324.7819981635698&dec=0.6022457454127801
Posted
-
by Abe_Hoekstra
Awesome work, Billy!
Posted
-
by Budgieye moderator
posted for CeciliaB
http://talk.galaxyzoo.org/#/subjects/AGZ000ay64
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=359.4218847426957&dec=1.069313186947159
Posted
-
I just woke up to this have pointed Aida at this will see what she can do i will have a nose as well and i Showed this to Alice penguin Galaxy
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bcbn
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=244.07037463167066&dec=9.354511805280412
Posted
-
by Lovethetropics in response to Blackprojects's comment.
Right here Mark, will start looking for new peas.
Clear skiesPosted
-
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=22:30:37.269&dec=-00:06:28.13
Posted
-
😃 pic-size editing only copied from DZM, who hopefully sticks around here
Posted
-
by williamaskew in response to Ghost_Sheep_SWR's comment.
the size format makes for a tighter looking thread which is easy to navigate. nice addition above
Posted
-
Purple / pink pea, pea merger?
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=320.1831379027702&dec=1.0019062771779668
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000b807
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=134.50259863166153&dec=25.697923712997937
Posted
-
by williamaskew
a bit of noise and low ratio but Ive seen worse
http://talk.galaxyzoo.org/#/subjects/AGZ000bfoh
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?ra=08:51:15.26&dec=+27:48:37.35
Posted
-
Updated AGZ000av5b on page 10. When the list on page 1 keep growing might an alphabetical list, based on last 4 symbols of GZ ID, not be better suited for quick scanning / checking?
Posted
-
by Abe_Hoekstra
http://talk.galaxyzoo.org/#/subjects/AGZ000aqk1
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=2.6784965598362827&dec=-1.0336030509306133
Posted
-
Unfortunately blue compact dwarf galaxy. Nice spectrum in comparison to Peas though
http://cas.sdss.org/dr9/en/tools/explore/obj.asp?ra=154.102151&dec=37.912768
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000b31x
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=123.51573047667657&dec=23.891356246836864
Posted
-
by Abe_Hoekstra
http://talk.galaxyzoo.org/#/subjects/AGZ000bf9i
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=127.75199714731093&dec=26.865494746348208
Posted
-
by Rick_Nowell in response to Abe_Hoekstra's comment.
Nice one Abe. And un-referenced in NED. Sweet!
As an aside, it's worth remembering that in the original GPs study, 251 GPs were eventually unearthed using a database query program. Only 80 of those were taken forward for closer examination, while the remaining GPs were sidelined, mainly because their spectra were faulty or had errors etc. So, two-thirds of the collected GPs were never used in the final paper. Spectra have to be faultless.
Posted
-
by Abe_Hoekstra in response to Rick_Nowell's comment.
I am enjoying myself a lot, Rick, now that I have returned to Galaxy Zoo. I am so glad to be doing science again 😃.
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?&_ga=1.249488007.1480981649.1447195595#/subjects/AGZ000auv0
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=318.71450279620154&dec=-1.179562239526298
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000awcj
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=331.05184925334845&dec=0.3670184496391054
Posted
-
by Rick_Nowell
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237661382775603209
This Blue Compact Dwarf posted by Ghost_Sheep has such extraordinary flux levels. The readings are measured in thousands, with a peak for [OIII] on the graph over 4000, but a reading of 5008 [OIII] = 2.325e+04 in the interactive spectrum. Huh?
Either it is the most extraordinarily active galaxy or the spectrum's wrong. It has 26 refs in NED.Posted
-
by Rick_Nowell
99851
11433
26052Some more TYPE=STAR GPs posted by William and Abe from DECaLS_DR2.
The spectrum seen on the SDSS graph might not represent the entirely correct values, but is more of a 'first see'. For instance:
GP99851 has an [OIII] peak on the graph round 200 ergs [10^-17erg/cm2/s] (by eye), whereas when using the interactive spectrum [OIII] has a figure of 1170 ergs etc. Quite a difference!
GP11433 has an [OIII] peak on the graph of round 30 ergs and an interactive spectrum value of 185 ergs for [OIII].
GP26025 has an [OIII] peak on the graph of round 65 ergs and an interactive spectrum value of 377 ergs for [OIII].
This can be shown to the extreme by the GP with the biggest [OIII] to [OII]:
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237662500007248142
On the SDSS graph GP48142 has a value of round 1200 ergs for [OIII] (by eye), but on the interactive spectrum the reading is 6368 ergs for [OIII]. A huge difference and a ratio of more than 85 to the levels of [OII], but is either right or wrong?
=========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237661126147899851
http://legacysurvey.org/viewer/?ra=123.26261&dec=24.48318&zoom=16&layer=decals-dr2
=========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237664879412511433 (one ref in NED)
http://legacysurvey.org/viewer/?ra=140.89833&dec=29.27223&zoom=16&layer=decals-dr2
=========
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237661125613126052
http://legacysurvey.org/viewer/?ra=127.75201&dec=26.86554&zoom=16&layer=decals-dr2
=========
https://en.wikipedia.org/wiki/Pea_galaxy
Posted
-
by mlpeck in response to Rick_Nowell's comment.
This Blue Compact Dwarf posted by Ghost_Sheep has such extraordinary
flux levels. The readings are measured in thousands, with a peak for
[OIII] on the graph over 4000, but a reading of 5008 [OIII] =
2.325e+04 in the interactive spectrum. Huh? Either it is the most extraordinarily active galaxy or the spectrum's wrong. It has 26 refs
in NED.The quantities listed in the interactive spectrum page are emission line fluxes integrated over the entire line. You're comparing those to, I guess, eyeballed peak monochromatic fluxes, which are quite different.
If you want to make systematic use of emission line data the MPA database is probably reasonably accurate. Measurements are provided in the galSpecLine table accessible from the object explorer. Those are only available for releases through DR8 though, so there's no data for BOSS targets.
Another public database is OSSY, which has a loose GZ connection (the second S is Schawinski).
Aren't you guys finding examples of "Luminous Compact Galaxies" and/or "Blue Compact Dwarfs?" If not, how are they different?
Posted
-
by Rick_Nowell in response to mlpeck's comment.
Thanks for the info. It's good to know these things! The measurements seemed so at odd with one another.
Luminous Compact Galaxies, (GPs), are starformers without AGN, whereas BCD are starformers that might or do have AGN.
Posted
-
by williamaskew
z0.019
http://talk.galaxyzoo.org/#/subjects/AGZ000av7a
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=321.02058163176685&dec=0.9877944631671259
Posted
-
by Rick_Nowell
This image and text compares various measurements over two graphs and line-readings for a GP:
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237671262812897597
[OIII] readings are: graphic spectrum=~225x10^-17erg/cm2/s, interactive spectrum=~310 ergs and a line measurement reading of: [O_III] 5008.2=1806 ergs.
Posted
-
by Rick_Nowell
Interestingly, perhaps, Claude has kindly, and for free, modified some database query coding that was put together on the GZ forum to search for some GPs when we were writing a letter for GZ letters.
It's been modified to have a redshift between z=0.01 and 0.11 and to work in DR12, whereas GPs are usually found beyond z=0.11. So perhaps by working new databases, some new GPs could be discovered or confirmed.
Unfortunately, the coding doesn't want to display here in the right way, but approx. 220 objects have been returned. The first job I'll do is to put the objects with a DR12 address, although if anybody wants to do 50 or so, that would be very handy. The list is compiled like:
name=
1237671939266511342
ra=
252.389958080796
dec=
63.1215145970363A couple as examples:
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237679543502635215 TYPE=STAR
http://skyserver.sdss.org/dr12/en/tools/explore/summary.aspx?id=1237652942096957540 TYPE=STAR
Work in progress...
http://skyserver.sdss.org/dr12/en/tools/search/sql.aspx
http://skyserver.sdss.org/dr12/en/tools/search/x_sql.aspx seems to work, at least now.
Posted
-
by Rick_Nowell
Most of them so far seem to be bits of galaxies or AGNs. Nothing really Pea type. Perhaps if we run coding without two subclasses as Claude suggested. It's annoying to have to use an image. If we use one subclass each, as below, rather than the two I used, with redshift between 0.01 to 0.15. Put the code in the address below and wait.
DR12 http://skyserver.sdss.org/dr12/en/tools/search/sql.aspx
Choose output format "csv" and copy paste the list in: http://skyserver.sdss.org/dr12/en/tools/chart/listinfo.aspx
This is the coding in image form:
If William uses the one below and Abe uses one with (s.subclass="STARFORMING") You'll probably have to copy it out manually.
subclass=STARBURST, subclass=STARFORMING.
Posted
-
Query below contains mostly objects as the one posted before, but some really have close pea-like spectra, some maybe mis-identified?
When selected an object usually you can view them in SDSS by a button all the way down on the page
Posted
-
by williamaskew in response to Rick_Nowell's comment.
158 "starburst and the rest, I take it will be ?starforming ,86" I have what you need.
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bf7p
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=129.74526334760688&dec=27.94468842554627
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000aybj
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=353.06663742699834&dec=-1.112655194253296
Posted
-
by williamaskew
I knew the centre galaxy wasnt much but the blue object at 1 o'clock looked suspect. After checking on navigate I was pleased to see it had a spectrum. A nice one at that! I included the link to both of the SDSS pages
http://talk.galaxyzoo.org/#/subjects/AGZ000b1cf
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237657190902792354
Posted
-
by williamaskew
Meh! not the best spec.
http://talk.galaxyzoo.org/#/subjects/AGZ000axom
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=118.03802595838819&dec=28.646872771401018
Posted
-
by williamaskew
Ratio on the interactive spectrum is higher so I will replace soon
http://talk.galaxyzoo.org/#/subjects/AGZ000aq1h
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=345.152422841922&dec=-0.3371568949267643
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000atvl
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=319.9929652359738&dec=0.8759868641707981
Posted
-
by williamaskew
The ratios on the interactive spectrum are much higher
http://talk.galaxyzoo.org/#/subjects/AGZ000aqzl
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=321.25579766644523&dec=10.100364148936396
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000aye1
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=350.34379772546845&dec=0.5819520752039883
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000azmb
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=124.3850686404194&dec=28.357827881224637
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000bdh7
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=249.52507293004908&dec=12.249186517374822
Posted
-
by williamaskew
Ratios larger in interactive spectrum
http://talk.galaxyzoo.org/#/subjects/AGZ000avgq
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=323.41230861028714&dec=0.4347393390487668
Posted
-
by williamaskew
I checked to see if this field held anything and the orange object at 10 o'clock is what showed up, without a spectrum but the blue object next to it did. Though not that great it is better in interactive
http://talk.galaxyzoo.org/#/subjects/AGZ000be4i
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237656567042605990
Posted
-
by williamaskew
As usual, interactive spec is way stronger
http://talk.galaxyzoo.org/#/subjects/AGZ000aqbx
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=354.466403278746&dec=-0.16682117823344023
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?&_ga=1.177587621.1480981649.1447195595#/subjects/AGZ000b028
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=118.07264693674304&dec=21.19573785110374
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000aq71
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=349.7634477779024&dec=1.1481979463933982
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?&_ga=1.253542665.1480981649.1447195595#/subjects/AGZ000asmb
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=116.24089516931245&dec=29.557124208937317
Posted
-
by williamaskew
480981649.1447195595#/subjects/AGZ000amha
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=337.653321864772&dec=-0.11028262021813452
Posted
-
by williamaskew
http://talk.galaxyzoo.org/?&_ga=1.16308278.189379650.1438018854#/subjects/AGZ000bfi6
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237662636376653975
Posted
-
by williamaskew
Identified by Bluemagi
http://talk.galaxyzoo.org/?_ga=1.226194202.189379650.1438018854#/subjects/AGZ000aycf
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=353.831278536078&dec=1.1914650151874076
Posted
-
by williamaskew
http://talk.galaxyzoo.org/#/subjects/AGZ000aywh
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=318.6013479487112&dec=0.9868050454962478
Posted
-
by c_cld
#pea SDSS J131721.77+195551.9 1237668298746888308
SDSS DECaLS
Posted
-
by williamaskew
Identified by Bluemagi
http://talk.galaxyzoo.org/?_ga=1.192658602.189379650.1438018854#/subjects/AGZ000belg
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=333.080929024688&dec=2.677396031343426
Posted