Radio Galaxy Zoo Talk

ARG0003kz0, IFRS?

  • ChrisMolloy by ChrisMolloy

    Here's ARG0003kz0, which appears to be either a #doublelobe or possibly a #triple. As for this being a #triple, this is dependant on the centre lobes not being #artefacts.

    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, NVSS cyan.

    As per the classification comments left, a possible host for this emission could be SDSS J095853.77+034520.7, which is listed as a star in SDSS DR13. This object is offset from the centre of the lobes to the NE, and there doesn't appear to be any radio references for this object.

    SDSS J095853.77+034520.7

    enter image description here

    There is the possibility that this emission is an #IFRS, due to the apparent absence of any proximity related radio sources or hosts, which align with the centre of the emission.

    As always, comments, suggestions, welcome.

    Posted

  • 42jkb by 42jkb scientist, admin

    Again, great work on the image and using JeanTate's code to do this.

    What SNR are the NVSS contours at? The reason I ask is because I want to know if all radio emission could be connected. Plus, I'm interested in the NVSS contours at the top going off the page.

    Have you had a chance to look at TGSS?

    Posted

  • ChrisMolloy by ChrisMolloy in response to 42jkb's comment.

    The NVSS and First parameters I'm using are as follows:

    Nnsignoise = 4 # NVSS noise floor, in sigmas;
    Nsf = np.sqrt(2.0) # NVSS contour scale factor;
    Nsmooth = 20 # sigma for gaussian smoothing (NVSS contours).

    Fnsignoise = 2 # FIRST noise floor, in sigmas;
    Fsf = np.sqrt(3.0) # FIRST contour scale factor;
    Fsmooth = 4.0 # sigma for gaussian smoothing (FIRST contours).

    Have only looked at VLSSr but will look at TGSS. I wondered whether all the First emission could be connected, including the far SE First lobe.

    Posted

  • ChrisMolloy by ChrisMolloy in response to 42jkb's comment.

    Here's the TGSS image.

    ![enter image description here](https://i.imgur.com/EqNNJG2.png)

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

    Here's the parameters I used.

    Tnsignoise = 1.2 # TGSS noise floor, in sigmas;
    Tsf = 1.2 # TGSS contour scale factor;
    Tsmooth = 13 # sigma for gaussian smoothing (TGSS contours).

    Posted

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

    Cool! 😃

    But that makes the mystery deeper, doesn't it? Maybe a FIRST+TGSS contour overlay image?

    Posted

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

    Here's the First TGSS overlay. Without further observations, I don't think it adds anything to the mystery.

    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 contours in red, TGSS white.

    Posted