Galaxy Zoo Talk

Neon green nucleus

  • zutopian by zutopian

    No spectrum in SDSS and no info in NED. #Green nucleus looks weird.
    Misalignment?
    #AGN ?
    Reminds me of a #greenpea , but it looks like a spiral.

    Posted

  • trevor_allen_faller by trevor_allen_faller

    weird barred ring 4 me

    Posted

  • zutopian by zutopian

    How does it look on the FITS images? I have however no available link to view those.

    Posted

  • planetaryscience by planetaryscience

    in the midst of this (Very) active discussion, I can confirm that the green line in the galaxy is not an artifact.

    Posted

  • Budgieye by Budgieye moderator

    I think we might contact a scientist about this one. Anyone have any ideas on what it may be? Is C. Cardamone a good person to contact?

    posted in the Forum

    http://www.galaxyzooforum.org/index.php?topic=280493.msg620397#msg620397 by Zutopian

    http://www.galaxyzooforum.org/index.php?topic=3515.msg626165#msg626165 by Tony Wei

    Posted

  • ccardamone by ccardamone scientist

    Hi, The deep green color does suggest an emission line dominating the "R" filter. This is just what happens with the Peas. However, it can also happen with AGN. There are a set of Narrow Line Seyfert I galaxies (a type of AGN) that appeared in the original Peas sample. Given the morphology of this galaxy, my best guess is that this is one of those galaxies. That means the color would be caused by accretion around a black hole and not star formation. Without a spectrum however, there is no way to know for sure.

    • Carie

    Posted

  • Budgieye by Budgieye moderator

    Thank you ccardamone. Maybe we should start a hopeful Hubble list for unusual objects that need a closer look.

    Posted

  • Alpha_Aurigae by Alpha_Aurigae in response to Budgieye's comment.

    I second that 😃

    Posted

  • Alpha_Aurigae by Alpha_Aurigae

    This one has a green nucleus too, and it is a Markarian galaxy: AGZ00020j8 .
    And this galaxy is an AGN: AGZ0004e9d

    Posted

  • Budgieye by Budgieye moderator

    Nice examples, thank you Alpha Auriga. The first has a spectrum. There is oxygen and hydrogen, so it is a pea #pea and an AGN #agn There may be a double nucleus, interacting, and with eventual fusion, with big boom and gravity waves.

    enter image description here

    http://www.galaxyzoo.org.s3.amazonaws.com/subjects/standard/1237657067403542567.jpg

    http://talk.galaxyzoo.org/#/subjects/AGZ00020j8

    MRK 0563 #MRK

    enter image description here

    http://skyservice.pha.jhu.edu/DR8/ImgCutout/getjpeg.aspx?ra=17.95823179&dec=-1.65512932&scale=0.2&width=200&height=200&opt=G

    enter image description here

    OIII peaks in the middle(green) and hydrogen alpha over to the right.

    http://ned.ipac.caltech.edu/spc1/2009/2009MNRAS.399..683J/121/6dFJ0111500-013918:S:VR:j2009_sp.png

    SDSS J011149.97-013918.4

    http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237657067403542567

    Publication: http://iopscience.iop.org/0004-637X/675/2/1459/pdf/72322.web.pdf

    Posted

  • Budgieye by Budgieye moderator

    The second one: NED says a flat spectrum radio #radio source.Optical spectrum below. looks like hydrogen alpha only, so an active nucleus only AGN #AGN with a hint of star-forming.

    enter image description here

    http://www.galaxyzoo.org.s3.amazonaws.com/subjects/standard/1237676672850722955.jpg

    SDSS J015006.21-164033.2

    http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237676672850722955

    enter image description here

    http://ned.ipac.caltech.edu/spc1/2009/2009MNRAS.399..683J/11/6dFJ0150062-164033:S:VR:j2009_sp.png

    looks like hydrogen alpha only, so an AGN #AGN.

    NED says a flat spectrum radio #radio source.

    http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237676672850722955

    posted by zutopian http://www.galaxyzooforum.org/index.php?topic=280592.msg624157#msg624157

    http://cas.sdss.org/dr7/en/tools/explore/obj.asp?id=587748061117022274 nothing in forum under 58...

    Posted

  • Dolorous_Edd by Dolorous_Edd

    I wonder could this be a giant radio galaxy? Host SDSS J015006.21-164033.2

    Image from NVSS survey ( also visible in VLSSr )

    enter image description here

    For photo_z = 0.3 and ~4' size this would be around 1,1 Mpc

    Edit NED gives redshift = 0.161551 the size will be around 600 - 700 kpc*

    Here is SDSS image with contours from NVSS

    enter image description here

    Posted

  • Budgieye by Budgieye moderator

    Wow that is huge. Thank you Dolorous Edd.

    I tried to do a search there using SDSS J015006.21-164033.2 but I got zero results.

    Can you make a link to the Talk page?

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to Budgieye's comment.

    Done

    Posted

  • Budgieye by Budgieye moderator

    Sorry, I meant can you post a hot link here, that will take me to something in Radio Galaxy Zoo?

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to Budgieye's comment.

    How about this thread?

    http://radiotalk.galaxyzoo.org/#/boards/BRG0000003/discussions/DRG00001mg

    Posted

  • Budgieye by Budgieye moderator

    Thank you again, there it is on page 5. I really should get into radio galaxies.

    What does flat spectrum mean in radio? In optical, it usually means a blazar, looking at a quasar face-on.

    What is a triple? a source and 2 jets?

    Posted

  • Alpha_Aurigae by Alpha_Aurigae

    Wow, you two have been busy 😃. A lot of this is new for me, so I have to read your analyses a number of times before I can even begin to understand all the information. It is very educational, and even more appreciated. Thanks 😃.

    Posted

  • JeanTate by JeanTate in response to Budgieye's comment.

    NED gives its redshift as 1.161551, presumably from the 6dF survey. At this redshift, Hα would be beyond the red end of the spectrum posted; the three prominent emission lines between 5k and 6k Å are Hβ and the two [OIII] nebular lines (rest, vacuum, wavelengths 5008Å and 4960Å); the other prominent one - between 4k and 5k Å - is the [OII] doublet (ditto, ~3727Å).

    There's too little info in the spectrum to say*, with any certainty, simply by visual inspection, whether the emission lines are more likely due to an AGN, or a star-formation region (possibly a star-burst), or both. A quantitative analysis might give a fairly robust answer.

    *IMO; if an astronomer with particular expertise in this field were to drop by, would you please comment?

    Posted

  • JeanTate by JeanTate in response to Budgieye's comment.

    What is a triple? a source and 2 jets?

    Yes; or more usually, a host (core, an AGN) and two lobes (more or less where the jets terminate in the inter-galactic medium).

    Posted

  • Budgieye by Budgieye moderator

    If I have the SDSS number, how do I find the corresponding image in Radio Galaxy Zoo Talk? I went into Search, and I tried putting all the variations of the SDSS number that I could think of. I tried replacing SDSS with FIRST but it didn't help, maybe I didn't do it correctly.

    Posted

  • Budgieye by Budgieye moderator in response to JeanTate's comment.

    So that galaxy with the green nucleus that we see is not related to the huge lobed radio source in the sky?
    But there's nothing there 😦

    http://talk.galaxyzoo.org/#/subjects/AGZ0004e9d

    Open in Tools

    ..err ..how do I get to the infrared data?

    oh, ... open in Examine and look at the z band.

    http://www.galaxyzoo.org/#/examine/AGZ0004e9d

    the source would be just outside the image, but still I don't see anything there.

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to Budgieye's comment.

    If I have the SDSS number, how do I find the corresponding image in Radio Galaxy Zoo Talk? I went into Search, and I tried putting all the variations of the SDSS number that I could think of. I tried replacing SDSS with FIRST but it didn't help, maybe I didn't do it correctly.

    You will find it only if somebody put SDSS number in commentary. It is still possible to find related RGZ picture if you have coordinates, but you have to ask Jean Tate for this

    From personal experience :
    When search by SDSS ID don't put SDSS prefix ( it will give too many results )

    Example: if you want to search for SDSS J015006.21-164033.2

    Search for J015006.21-164033.2

    So that galaxy with the green nucleus that we see is not related to the huge lobed radio source in the sky?

    I think that SDSS J015006.21-164033.2 is the source of radio emission

    Although for z = 0.161551 the size will be around 672kpc

    Sadly, outside VLA FIRST survey that would have made things clearer

    how do I get to the infrared data

    here or here

    Posted

  • Alpha_Aurigae by Alpha_Aurigae

    I'd like to throw another galaxy into the mix, this one also has a green nucleus: AGZ00030he

    Posted

  • Budgieye by Budgieye moderator

    wow another brilliant green nucleus, no publications, nothing in NED. no spectrum, tried search in Radio Galaxy Zoo, didn't find anything, my search technique may be unsatisfactory.

    SDSS J022624.58+054242.2

    Maybe "pea" type galaxies don't have relativisitic jets.

    z 0.146622
    zErr 0.062622

    Posted

  • vrooje by vrooje admin, scientist in response to Alpha Aurigae's comment.

    While this is certainly not true of every object in this thread, I think the green in AGZ00030he is an artifact based on looking at the rest of the sources around it. 😦

    Posted

  • JeanTate by JeanTate in response to Dolorous Edd's comment.

    Concerning finding RGZ objects ...

    If I have the SDSS number, how do I find the corresponding image in Radio Galaxy Zoo Talk? I went into Search, and I tried putting all the variations of the SDSS number that I could think of. I tried replacing SDSS with FIRST but it didn't help, maybe I didn't do it correctly.

    You will find it only if somebody put SDSS number in commentary. It is still possible to find related RGZ picture if you have coordinates, but you have to ask Jean Tate for this

    You may find this RGZ Talk thread of interest: Given coordinates, or a FIRST ID, how to find the ARG ID(s), if there is one? (there's also a similar GZT one too*). To quote from the last post:

    My Plan B worked sufficiently well for the purpose I intended. And it's likely a method that could be pretty easily generalized so that if a particular FIRST source is among the ARG IDs, then it could be found within seconds (perhaps not with 100% reliability though).

    My coding skills are poor indeed, yet given that my Plan B works about as well as I had expected, surely it's not a stretch to think a member of the Development Team (or any one of hundreds of other ordinary zooites) could code up a half-way decent tool, to find ARG IDs given coordinates (if such ARG IDs exist)? True, the reliability may be only ~90%. What's more, as coding newbie me took mere ~hours, a skilled person could do the job in ~an hour, wouldn't you think?

    *I expect doing something similar for GZ, even if to find only an AGZ ID among SDSS objects, would be more challenging.

    Posted

  • Budgieye by Budgieye moderator

    Thank you vrooje, you are correct, many objects are green in that image.

    Posted

  • Alpha_Aurigae by Alpha_Aurigae

    Thanks for looking into AGZ00030he . I wish I had consulted the Skyserver image first, but my enthusiasm got in the way. Not the first time.
    P.S. I have been having laptop problems but I will be back later this week.
    Cheers,
    Abe

    Posted