Computer Science
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1201...45c&link_type=abstract
THE MONSTER'S FIERY BREATH: FEEDBACK IN GALAXIES, GROUPS, AND CLUSTERS. AIP Conference Proceedings, Volume 1201, pp. 45-48 (200
Computer Science
1
Star Formation, Stellar Mass, Photometry, Star Formation, Masses, Photography And Photometry
Scientific paper
We present a new method to estimate the average star formation rate per unit stellar mass (SSFR) of a stacked population of galaxies. We combine the spectra of 600-1000 galaxies with similar stellar masses and parameterize the star formation history of this stacked population using a set of exponentially declining functions. The strength of the Hydrogen Balmer absorption line series in the rest-frame wavelength range 3750-4150 A˚ is used to constrain the SSFR by comparing with a library of models generated using the BC03 stellar population code. We apply our method to galaxy samples drawn from SDSS and DEEP2 to study mass-dependent growth of galaxies from z~1 to z~0, finding that (1) high mass galaxies have lower SSFRs than low mass galaxies; (2) the average SSFR has decreased from z = 1 to z = 0 by a factor of ~3-4, independent of galaxy mass. Additionally, at z~1 our average SSFRs are a factor of 2-2.5 lower than those derived from multi-wavelength photometry using similar datasets.
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