Building the low-mass end of the red sequence with local post-starburst galaxies

Details Building the low-mass end of the red sequence with local post-starburst galaxies Building the low-mass end of the red sequence with local post-starburst galaxies

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21820605w&link_type=abstract

American Astronomical Society, AAS Meeting #218, #206.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of local post-starburst galaxies (PSG) using the photometric and spectroscopic observations from the Sloan Digital Sky Survey (SDSS) and the results from the Galaxy Zoo project. We find that 74% of the local PSG are of indeterminate morphology. These local PSG also occupy a well-defined space within the color-stellar mass diagram, most notably in the low-mass end of the green valley below the transition mass described by Kauffmann et al. to be the mass division between low-mass star-forming galaxies and high-mass passively-evolving bulge-dominated galaxies. Our analysis suggests that it is likely that a local PSG will quickly transform into low-mass early-type galaxies as the stellar morphologies of the green PSG largely resemble that of the early-type galaxies within the same mass range. We propose that the current populations of PSG represent one population of galaxies which are rapidly transitioning from the blue cloud to the red sequence and subsequently, contributing towards the build-up of the low-mass end of the red sequence. This finding is consistent with the idea of downsizing where the build-up of smaller galaxies occurs at later epochs.

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