The Possible Evolutionary Connection between E+A Galaxies and GALEX UV-excess Early-type Galaxies

Details The Possible Evolutionary Connection between E+A Galaxies and GALEX UV-excess Early-type Galaxies The Possible Evolutionary Connection between E+A Galaxies and GALEX UV-excess Early-type Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342434c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #424.34; Bulletin of the American Astronomical Society, Vol. 41, p.251

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Strong Balmer absorption lines and the lack of Hα and [OII] emission lines signify that E+A galaxies are post-starburst systems. Recent studies suggest that E+As may undergo the transition from `blue cloud’ to `red sequence’ and eventually migrate to red sequence early-type galaxies. An observational validation of this scenario is to indentify the intermediate phase that smoothly connects the E+As to red-sequence early-type galaxies. Motivated by recent findings with GALEX that an unexpectedly large fraction of early-type galaxies exhibit UV-excess as a sign of recent star formation, we investigate the possible evolutionary connection between UV-excess early-type galaxies and E+As. Comparison of the Fundamental Planes suggests that a certain group of UV-excess early-type galaxies are indeed consistent with being the products of passively evolved E+As after quenching star formation quite a while ago ( 1 Gyr, "the old E+A scenario"). Another plausible scenario is that the particular group of galaxies experienced starburst that were weaker than those observed in E+As (1 10 % of E+As, "the weak E+A scenario"). We refer to such galaxies as "E+a” (named after "E+A"), which stands for elliptical ("E") galaxies with a minority of A-type ("a") young stars.

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