Radio Galaxy Zoo Talk

ARG0003qiu, diffuse doublelobe, SDRAGN candidate? compact noir

  • ChrisMolloy by ChrisMolloy

    Here's ARG0003qiu, a #doublelobe, and a #compact, #noir emission.

    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.

    The host for the #doublelobes, which are in the centre of the image, could be SDSS J025145.38+014118.2, which has a z_ph=0.182 ± 0.0355. There is an ALLWISE reference for this galaxy, ALLWISE J025145.38+014118.0, and interestingly, there are ALLWISE reference for both these lobes also.

    As per the classification comments left, and whether SDSS J025145.38+014118.2 is an #SDRAGN candidate, it has a fracDev_g, _r, of 0, and 0.329, and an expAB_g of 0.917 and expAB_r of 0.873 respectively. For c, the inverse concentration index, it has a figure of 0.476 for the g band and 0.485 for the r band. On the above parameters, it could possibly be an #SDRAGN candidate, or more likely, a #disk galaxy.

    SDSS J025145.38+014118.2

    enter image description here

    Here's a zoomed in image of SDSS J025145.38+014118.2.

    enter image description here

    To the SW, there's a #compact emission, with no apparent ir host in the ARG image left. The lobe appears to be very slightly off centre with SDSS J025143.84+014042.4, which SDSS lists as a star. There's no apparent ALLWISE references for this lobe.

    SDSS J025143.84+014042.4

    enter image description here

    Any comments, suggestions, welcome.

    Posted

  • ivywong by ivywong scientist, admin

    IHmm, call me a sceptic but I am not sure that the northernmost radio source is related to the pair south of it. In my opinion, the northernmost radio source is an unresolved background source and the pair below is a double. Therefore I do not think that this is a #SDRAGN... 😦

    Posted

  • JeanTate by JeanTate

    This one is tough! 😮

    In favor of @ivywong's interpretation, there seems to be really faint IR source ~at the same location as the N radio source, and a similarly faint IR source between the two S ones.

    Perhaps a contour overlay on a WISE canvass might help?

    Posted

  • ChrisMolloy by ChrisMolloy

    Thanks Ivy, Jean.

    I'm gonna have a "bob each way" on this one, although leaning more towards it being a #doublelobe centre with the SW separate.

    Below is a Wise Band 1 image. First contours in white. More a fiery colour.

    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.

    Posted

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

    Despite its fiery appearance, the FIRST contour overlay image on WISE is really, really cool! 😃

    It certainly helps with identification (it has a higher resolution than the ARG one, and the color scheme brings out intensity differences more clearly).

    Perhaps a WISE contour overlay image on SDSS canvass? WISE band 2 may be a slightly better choice than band 1 (WISE cutouts, of sizes you want, as FITS are available from SkyView, and no doubt elsewhere too).

    Posted

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

    Thanks.

    Here's a very rudimentary overlay on SDSS from Wise Band 1 for now. Got to work a bit more on the python code. Bit strapped for time.

    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.

    So, quick question, the ARG images are a composite of Wise Band 1 and 2?

    Posted

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

    It might look a bit funny, but maybe first try an SDSS canvass with a WISE band 1 contour overlay? That'll quickly show to extent to which the possible WISE hosts of the FIRST radio sources are also SDSS photometric objects.

    Posted

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

    Because it's a straight blend it makes no difference using Wise or SDSS first as the canvas. I'll look at expanding the code and maybe using different parameters in SkyView colour table.

    Posted

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

    Once you've played with this a few times, you may find a few surprises! 😃

    Posted

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

    Here's a Wise Band 1 contour overlay on SDSS. Wise contours lime for now.

    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.

    Posted

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

    Very cool, Chris! 😃

    Interesting to see that some SDSS sources are very faint in WISE, and a couple not IR sources at all. And vice versa. Not counting the asteroid 😉

    Do you think you could add FIRST contours to this overlay image?

    Posted

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

    Definitely an interesting image.

    Do you think you could add FIRST contours to this overlay image?

    Will do.

    Posted

  • ChrisMolloy by ChrisMolloy

    Here's a Wise band 1, First contour overlay on SDSS. Wise lime green, First red.
    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.

    Posted