Integrated field spectroscopy of E+A (post-starburst) galaxies with the Kyoto tridimensional spectrograph II

We have performed two-dimensional spectroscopy of three nearby E+A (post-starburst) galaxies with the Kyoto tridimensional spectrograph II (Kyoto3DII) integral field spectrograph. In all the cases, H delta absorption is stronger at the centre of the galaxies, but significantly extended at the scale of a few kiloparsec. For one galaxy (J1656), we found a close companion galaxy at the same redshift. The galaxy turned out to be a star-forming galaxy with a strong emission in H gamma. For the other two galaxies, we have found that the central post-starburst regions possibly extend toward the direction of the tidal tails. Our results are consistent with the merger/interaction origin of E+A galaxies, where the infalling-gas possibly caused by galaxy-galaxy merging creates a central starburst, succeeded by a post-starburst (E+A) phase once the gas is depleted.