Ray of material?

• by wassock moderator

  theres a comparitievly diffuse band of material in the 7 oclock position with a "harder" rubber band shape within it (kind of reminds me of Hannys object). Still trying to come up to speed here but the 'normal' prominent alpha H spike in the spectrum seems to be missing here - is that significant?

  Posted July 19, 2013 9:38 AM

• by JeanTate

  As I understand it, that's typical of E+A (a.k.a. K+A, post-quenched) galaxies. Nebular emission - H-alpha, [OIII], [NII], etc - has all but disappeared because star-formation ceased a few hundred million (or more) years earlier; however, things like tidal tails and (in ellipticals) shells take quite a bit longer to disappear.

  Mike Zevin - "Adler Mission Specialist and awesome future astronomer" - wrote a really nice summary of Ivy Wong (GZ Science Team member)'s paper, here.

  Posted July 19, 2013 12:40 PM