ARG0001hpj To the south is it a elliptical with a ring SDSS J131232.12+340206.7 1237665128011857998 ?

• by 1001G

  SDSS J131232.12+340206.7

  

  

  Posted December 16, 2015 5:46 PM

• by JeanTate in response to 1001G's comment.

  Nice! At zsp 0.089, the ring (or ringed) galaxy is close enough that the apparent color of the ring tells us that there's not much star-formation in it. Also, the bulge (which is almost entirely within the spectroscope's fiber) is both red and has some obvious emission lines, [OII], [NII] and [SII]; curiously H-beta is in absorption, but none of the other Balmer series seem to be. A fading starburst? or a weak AGN?

  Perhaps the galaxy had a close encounter relatively recently (i.e. in the last ~200 million years)?

  Posted December 17, 2015 11:59 AM

• by ivywong scientist, admin in response to JeanTate's comment.

  Probably longer than 200 million years but less than 1Gyr because you don't see much Balmer emission....

  Posted December 23, 2015 1:02 AM