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Paper: Revealing the Star Formation History of SDSS Ellipticals: A PCA Approach
Volume: 371, Statistical Challenges in Modern Astronomy IV
Page: 431
Authors: Rogers, B.; Ferreras, I.; Lahav, O.; Bernardi, M.; Kaviraj, S.; Yi, S.K.
Abstract: 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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