Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3806q&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #38.06; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
We investigate the dependences of galaxy star-formation history and galaxy morphology on environment, using color and H-alpha equivalent width as star-formation history indicators, using concentration and central surface brightness as morphological indicators, and using clustocentric distance as an environment indicator. Clustocentric distance has the virtue that it can be measured with very high precision over a large dynamic range. We find the following asymmetry between morphological and star-formation history parameters: star-formation history parameters relate directly to the clustocentric distance while morphological parameters relate to the clustocentric distance only *indirectly* through their relationships with star-formation history.This asymmetry has important implications for the role that environment plays in shaping galaxy properties and it places strong constraints on theoretical models of galaxy formation. Current semi-analytic models do not reproduce this effect.
Berlind Andreas A.
Blanton Michael R.
Hogg David Wardell
Quintero Alejandro D.
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