New Insights Into the Origin of the Morphology-Density Relation

Details New Insights Into the Origin of the Morphology-Density Relation New Insights Into the Origin of the Morphology-Density Relation

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742101e&link_type=abstract

American Astronomical Society, AAS Meeting #217, #421.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We present an analysis which matches traditional morphological classification of galaxies from the RC3 with a catalog of galaxy and galaxy-group halo masses based on SDSS data; this lets us study the local relations between galaxy morphology (including details such as bar and ring presence) and halo mass. We also investigate how morphology is affected by whether galaxies are "central" or "satellite" systems. The fraction of central galaxies which are ellipticals increases with halo mass, but this is not true for S0 galaxies; instead, it is in the satellite galaxies where we find a strong correlation between S0 fraction and halo mass.
We also compare our results with predictions from hierarchical, semi-analytic modeling in an effort to test the relevance of different formation channels and bulge-growth models for the distribution of elliptical, S0, and spiral galaxies.

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