Radio Galaxy Zoo Talk

080728.58+280122 - Rather hard to understand what is going on here

  • JeanTate by JeanTate

    From the Interesting things from NVSS survey thread, started by Dolorous Edd (page 2):

    Rather hard to understand what is going on here.

    Is it a one source??? ~ 08 07 28.58 +28 01 22.8

    enter image description here

    And DocR's response:

    080728.58+280122 very curious. There's one component in the south which is coincident on FIRST. No SDSS ID, no WISE available?(need to look again), no apparent Xrays, nothing obvious in VLSSr. Unfortunately, without the ARG number, I can't put this back into a collection.

    I haven't - yet - been able to find an ARG ID for the FIRST source; however, it would seem that the two main NVSS sources are independent (the lowest NVSS contour is 3.0 sigma above the sky):

    enter image description here

    Here's the southern FIRST/NVSS source, up close and personal in SDSS (photometric objects circled in blue; not properly centered on the FIRST source):

    enter image description here

    Perhaps a separate composite, centered on the white star-like object in the center of the northern NVSS source might be helpful? As well as one that gets closer to pinpointing the FIRST source ... (stay tuned).

    Boilerplate: SDSS image per http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx, FIRST (red) and NVSS (cyan) contours derived from FITS files produced using SkyView with Python code described in this RGZ Talk thread. Image center (121.8708, 28.0231*), (J2000.0).

    *NOT 28.231! There's a bug in my code! 😦

    Posted

  • JeanTate by JeanTate

    Perhaps a separate composite, [...] one that gets closer to pinpointing the FIRST source ... (stay tuned).

    The FIRST source is ARG0001ud7. DocR was right; there's no corresponding SDSS photometric object as host.

    Here's an overlay*:

    enter image description here

    And here are the DR10 SDSS photometric objects (blue circles):

    enter image description here

    Boilerplate: SDSS image per http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx, FIRST (red) contours derived from FITS file produced using SkyView with Python code described in this RGZ Talk thread. Image center is (121.8740, 28.0000) (J2000.0).

    *the bug in the code for the coordinates of the center has been fixed

    Posted

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

    Perhaps a separate composite, centered on the white star-like object in the center of the northern NVSS source might be helpful?

    The "white star-like object" is STAR SDSS J080721.46+280220.7; this composite image is centered on it:

    enter image description here

    Zooming in, and noting the SDSS photometric objects:

    enter image description here

    NED confirms that the "white star-like object" is only 0.005' (0.3") from the NVSS source.

    Boilerplate: SDSS image per http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx, NVSS (cyan) contours derived from FITS file produced using SkyView with Python code described in this RGZ Talk thread. Image center is (121.8395, 28.0391) (J2000.0).

    UPDATE (6 August, 2014): NVSS contour overlay on SDSS image replaced; there was a minor bug in the original (now fixed)

    Posted