Blue patch

• by Budgieye moderator

  Blue area, even blue colour. Galaxy fragment?

  DECaLS

  http://legacysurvey.org/viewer/jpeg-cutout/?ra=188.5701&dec=3.7331&zoom=14&layer=decals-dr2

  

  http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=188.56952309&dec=3.73396969&scale=0.2&width=200&height=200&opt=G

  http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=188.57001348682323&dec=3.733978172146282

  objID 1237655123937264146

  z 0.078391

  zErr 0.13569

  

  http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=188.56952309&dec=3.73396969&scale=0.09903175&width=512&height=512&opt=&query=

  ---

  nearby galaxy has an AGN Active Galactic Nucleus

  

  http://skyservice.pha.jhu.edu/DR9/ImgCutout/getjpeg.aspx?ra=188.57216775&dec=3.73907587&scale=0.2&width=200&height=200&opt=G

  http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237655123937263833

  

  http://skyserver.sdss.org/dr9/en/get/specById.asp?id=585622471328163840

  Posted August 26, 2016 7:59 AM

• by Budgieye moderator

  It is on Dr Keel's list of things to be studied.

  Posted August 27, 2016 9:13 AM

• by Astro_Denny

  Hi,
  I think this is another " blue patch" irregular galaxy.

  http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=187.81832016211848&dec=0.993978827527784

  http://legacysurvey.org/viewer?ra=187.81832016211848&dec=0.993978827527784&zoom=14&layer=decals-dr2

  There's no spectrum

  Posted August 27, 2016 12:57 PM

• by JeanTate

  Blue patches - of varying morphology, size, brightness etc - are common in SDSS images, in my experience. Some, like this one, are found in what look like interesting galactic environments (e.g. AGNs, merging galaxies, hearts of rich clusters); however, without spectroscopic redshifts it's impossible to say whether they are mere chance alignments.

  Posted August 27, 2016 2:26 PM