Dependence of Merger Rates and Ram Pressure Stripping on Environment and Galaxy Mass

Details Dependence of Merger Rates and Ram Pressure Stripping on Environment and Galaxy Mass Dependence of Merger Rates and Ram Pressure Stripping on Environment and Galaxy Mass

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918302h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #183.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

In order to disentangle the effects of different, potentially important, mechanisms in the process of galaxy evolution, it is important to understand how they depend on both environment and on galaxy mass and morphology. Galaxy morphology can be separated into two classes of parameters; those that describe star formation or color and those that describe structure. Both depend on environment, but they do so in somewhat subtly different ways. I examine how two different processes depend on environment and galaxy mass. First, an analytic model of ram pressure stripping is developed and its predictions compared to g-r colors and SFRs in groups and clusters in the SDSS. The observed dependence of color on group mass and satellite luminosity in the groups can be understood using the model. Second, a set of merger trees, built from a large N-body simulation, are used to examine the dependence of merger rates on environment, halo mass, and red shift. The results of this study can be applied both to galaxy evolution and to the clustering of luminous AGN. This work was funded by a NASA grant.

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