The role of the environment on evolution of dwarf and giant galaxies

Details The role of the environment on evolution of dwarf and giant galaxies The role of the environment on evolution of dwarf and giant galaxies

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007waas.work..105g&link_type=abstract

"1st Workshop of Astronomy and Astrophysics for Students" held in Naples (ITALY) on April 19-20, 2006. Published by INFN-Naples,

Astronomy and Astrophysics

Astrophysics

Scientific paper

We examine the origin of the bimodality observed in the global properties of the galaxies around a stellar mass of 3× 1010 M&sun; by comparing the environmental dependencies of star formation for giant and dwarf galaxy populations. Using SDSS DR4 spectroscopic data to create a volume-limited sample complete to M⋆+3 of 30000 galaxies, we show that the environmental dependencies of star formation in giant and dwarf galaxies are quiete different, implying fundamental differences in their evolution. Whereas the star formation histories of giant galaxies are determined primarily by their merger history, resulting in passively-evolving giant galaxies being found in all environments, we show that this is not the case for dwarf galaxies. In particular, old or passive dwarf galaxies are only found as satellites whitin massive halos (clusters, groups or massive galaxies), with none found in lowest density regions. This implies that star formation is much more resilient to the effects of the mergers, and the evolution of dwarf galaxies is primarily driven by the mass of their host halo, becoming passive by losing their halo gas reservoir to the host halo (suffocation), or through other environment-related processes such as galaxy harassment and ram pressure stripping.

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