Revealing the Star Formation History of SDSS Ellipticals: A PCA Approach

Details Revealing the Star Formation History of SDSS Ellipticals: A PCA Approach Revealing the Star Formation History of SDSS Ellipticals: A PCA Approach

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..371..431r&link_type=abstract

Statistical Challenges in Modern Astronomy IV ASP Conference Series, Vol. 371, proceedings of the conference held 12-15 June 200

Astronomy and Astrophysics

Astronomy

Scientific paper

We explore the power of Principal Component Analysis (PCA) as a tool to extract the star formation histories of galaxies from their unresolved stellar populations. We select a volume-limited sample of early-type galaxies from the Sloan Digital Sky Survey (SDSS). PCA recovers a dominant component in old stars (given as the first PC) and a small fraction of young stars (given as the second PC). These results are compared with the recent NUV observations of SDSS early type galaxies from GALEX. Even though our results explore the optical spectral window, we find a very significant correlation between NUV-r colour (indicative of recent star formation) and PC2.

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