An IR arch or an artifact?

• by davestringer

  There seems to be an IR arch between marked object (centre) and one above left, which coincides with a sort of radio shadow. An artifact or something interesting?

  Posted March 5, 2015 5:52 PM

• by JeanTate in response to davestringer's comment.

  Welcome to RGZ, davestringer! 😃

  I think the "IR arch" is several, relatively IR faint, galaxies, which are unresolved in the WISE image (it has a lower resolution than SDSS). Here's an SDSS image, centered on the z_sp 0.562 host SDSS J121243.78+290115.7; you can see a sorta chain of faint galaxies (I count four) going up to the brighter IR object (which is a STAR):

  

  I think the 'sort of radio shadow' is an artifact; FIRST images have a triangular 'noise' pattern (an inevitable consequence of how they are produced), and in this case one 'arm' of the triangle is close to the 'chain of galaxies'.

  Hope this helps.

  Posted March 5, 2015 6:48 PM

• by ivywong scientist, admin

  Spot on and thanks @JeanTate for another excellent follow-up.

  Welcome @davestringer!
  cheers,
  Ivy

  Posted March 6, 2015 4:20 AM