PCA and the Stellar Populations of Elliptical Galaxies

Details PCA and the Stellar Populations of Elliptical Galaxies PCA and the Stellar Populations of Elliptical Galaxies

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1111..187r&link_type=abstract

PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen

Computer Science

Giant And Subgiant Stars, Galaxy Clusters, Numerical Approximation And Analysis

Scientific paper

Using a volume-limited sample of ~7,000 early-type galaxies from the Sloan Digital Sky Survey (SDSS) we derive parameters based on Principal Component Analysis applied to the SDSS spectra. These parameters are highly sensitive to Recent Star Formation (RSF), as found both using synthetic models and galaxies with NUV photometry from GALEX. The dependence of environment on the presence of recent star formation is investigated in the groups catalogue of Yang et al. (2007). The sample is separated either with respect to stellar mass (representing an ``intrinsic'' observable) or halo mass (as a proxy for environment). We find environment plays a secondary role, whereas stellar mass is strongly correlated with the stellar populations.

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