Radio Galaxy Zoo Talk

An extreme hotspot case

  • DocR by DocR scientist

    Good catch by @WizardHowl . This is a quite extreme case of the hotspots of the double, seen in FIRST, being so much more compact than the lobes seen in NVSS. The attached image shows the FIRST image, with NVSS contours. The bold contour is the half-power of the NVSS source -- you can see that it is much bigger than the NVSS beam (red) in the south, so there's more emission than just the two compact sources.enter image description here


  • HAndernach by HAndernach scientist, translator

    possibly WISE J071846.61+462028.8, 2MASS J07184660+4620286 near middle
    of radio double; but, USNO B1.0 J071846.615+462029.02, is very bright B2/R2/I=16.0,15.3,14.7 mag, and listed with
    a proper motion of mu=45/51 mas/yr; GALEX FUV=undet; NUV=21.16 mag, so possibly a star?
    The SW "lobe" is FIRST J071842.450+461936.47 (deconvolved size 2.3" x 1.9" @115d) has 2MASS J07184250+4619362 within 0.5"
    and though in the 2MASS point source catalog, looks diffuse on DSS; that lobe has been measured in
    2007MNRAS.376..371Jackson: Polarisation of flat-spectrum radio sources; so, while I agree that the NVSS radio
    countours are very suggestive, the optical/IR picture doesn't give much support for the double; apart from the
    bright stellar source in the middle, there is a plate-limit object (R2=20.2mag) ~11"N of it: USNO B1.0 J071846.80+462040.5
    which could also be a host; we need deeper radio AND optical imaging