Radio Galaxy Zoo Talk

ARG00000de, Nat and extended compact

  • ChrisMolloy by ChrisMolloy

    Here's ARG00000de, which appears to be a #NAT, which an extended #compact lobe to the west. This ARG field is cross referenced in the following ARG post, ARG00000de LARGE CONTOUR & SMALL RADIO CONTOUR FROM 2 GALAXIES?

    enter image description here

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

    The host for the central #NAT, appears to be SDSS J171223.15+640157.0, which has a z_sp=0.080 +/-0.00001. This galaxy has recorded First flux emission, radio references in NED and SIMBAD, and an ALLWISE reference, ALLWISE J171223.15+640157.2. As per the discussion in the post, ARG00000de LARGE CONTOUR & SMALL RADIO CONTOUR FROM 2 GALAXIES?, it appears this galaxy could be a #disk galaxy and an #SDRAGN candidate.

    SDSS J171223.15+640157.0

    enter image description here

    The host for the extended #compact lobe to the west appears to be SDSS J171216.19+640212.3, which has a NED recorded z_sp=0.071436 +/- 0.000070. This galaxy has radio references in NED and SIMBAD, and an ALLWISE reference, ALLWISE J171216.20+640212.3.

    SDSS J171216.19+640212.3

    enter image description here

    This ARG field has been imaged in VLASS. The First emission appears more extended to the NE than VLASS, and there is #diffuse emission to the SW of the central emission in VLASS, which may be an #artifact.

    enter image description here

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

    As always, comments, suggestions, welcome.

    Posted

  • JeanTate by JeanTate

    Very cool! 😄

    The VLASS data strongly suggest that the main source is, in fact, a #triple, with the SW lobe very much fainter than the NE one. In addition, the emission to the E of the host suggests some kind of #x-shaped source, perhaps even a small #triple in the far background, making this an #overlap.

    Also odd: the #NAT to the W has its lobe going in the ~opposite direction to that of the main source! 😮 If they're both NATs, how come the IGM is "blowing" in opposite directions? Or does this mean that the host galaxies are moving - wrt the IGM - in opposite directions? Both would be weird ... and well worth following up on.

    Posted

  • ChrisMolloy by ChrisMolloy

    Thanks for the feedback.

    I was uncertain on the VLASS faint emission to the SW as to whether this was an #artifact or not.

    Also odd: the #NAT to the W has its lobe going in the ~opposite direction to that of the main source! 😮 If they're both NATs, how come the IGM is "blowing" in opposite directions? Or does this mean that the host galaxies are moving - wrt the IGM - in opposite directions?

    Can't answer this one, though an interesting observation. Could also point to different/additional hosts. Of note, both galaxies appear to be in #group, #cluster environments, as per the citings in NED, although having different redshifts. Definitely worth a follow up.

    Posted