Evolution Of The Morphology-Density And Star-Formation-Density Relation

Details Evolution Of The Morphology-Density And Star-Formation-Density Relation Evolution Of The Morphology-Density And Star-Formation-Density Relation

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3907c&link_type=abstract

American Astronomical Society Meeting 210, #39.07; Bulletin of the American Astronomical Society, Vol. 39, p.153

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We explore the evolution of the morphology-density and star-formation-density relation using the COSMOS-ACS survey and previous cluster studies. We find galaxies are transformed from late (spiral and irregular) to early (E+S0) type galaxies more rapidly in dense than sparse regions. At a given density, the early-type fraction grows constantly with cosmic time, but the growth rate increases with density as a power law of index 0.29+/-0.02. However, at densities below 100 galaxies per Mpc^2 no evolution is found at z>0.4. In contrast the star-formation-density relation shows strong evolution at all densities and redshifts, suggesting different physical mechanisms are responsible for the morphological and star formation transformation.

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