Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336201m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #362.01; Bulletin of the American Astronomical Society, Vol. 41, p.512
Other
1
Scientific paper
Post-starburst (E+A) galaxies are known as a short-lived phase when the gas abruptly exhausted in some starburst galaxies. Although they are first found inside galaxy clusters, recent studies using the all-sky survey data (e.g. Goto, et al. 2005 and Yan et al. 2008) demonstrates the majority of E+A population locates outside the cluster environment, which implies that the galaxy-galaxy merger/interaction is the major response to the E+A phase of galaxies. However, it does not mean the cluster-related mechanisms, specifically ram-pressure stripping, do not play a role. Actually, we believe the E+A galaxies can be separated into two population, one lives in the field, and the other lives around the core of the massive clusters, especially high redshift clusters.
Using the DEIMOS on Keck-II, we have conducted a wide-field spectroscopic survey on galaxies aound a statistically complete cluster sample selected from the X-ray flux limited MAssive Cluster Survey. The survey contains about 5000 spectra covering more than 50\% complete color-selected galaxies (brighter than M_*+2) around all of the large-scale structures within 6Mpc (radius) of each cluster. From these spectra, we identify many E+A galaxies, as well as their progenitors, e(a) and e(b) galaxies. We found the E+A galaxies in clusters preferentially locate inside the ram-pressure stripping radius, which strongly indicates the ram-pressure stripping is the dominant, if not unique, mechanism to quench the starburst in the E+A galaxies in clusters. By comparing the population of E+A galaxies in our cluster sample, in the foreground and background of our survey, and in the DEEP2 field, we investigate the difference of the two populations of E+A galaxies, and show it is more efficient to transform the starburst galaxies to post-starburst phase in clusters.
Ebeling Harald
Ma Cheng-Jiun
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