Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918105y&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #181.05; Bulletin of the American Astronomical Society,
Other
3
Scientific paper
Post-starburst (K+A) galaxies are galaxies that have had their star formation quenched recently and are on their way to become red sequence galaxies. The nature of the quenching mechanism in K+As is uncertain, but resolving it is critical to understanding the build-up of the red sequence population. With two large redshift survey datasets from SDSS (z 0.1) and DEEP2 (z 1), we have studied the K+A population at both low-z and high-z with identical methods. From the SDSS sample, we have discovered that the emission line commonly used to define K+A galaxies at high z, [OII] 3727, is heavily contaminated by LINER emission in many cases, complicating interpretation. Using selection techniques that avoid this problem, we find that at both low and high redshift, a large fraction of both red sequence and K+A galaxies have substantial [OII] and other line emission originating from AGN activity. K+A galaxies are preferentially found in underdense environments, which resembles their progenitors --star-forming galaxies. The implications from these studies for the quenching mechanisms of star formation will be discussed.
Funding for this work is provided by NSF through grants AST05-07428 and AST05-07483.
DEEP2 Team
Yan Renbin
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