Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 355, Issue 3, Pages 764-768Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08355.x
Keywords
galaxies : evolution; galaxies : fundamental parameters; galaxies : luminosity; function; mass function; galaxies : statistics; galaxies : stellar content; cosmological parameters
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Using the MOPED algorithm, we determine non-parametrically the stellar mass function of 96545 galaxies from the Sloan Digital Sky Survey Data Release One. By using the reconstructed spectrum due to starlight, we can eliminate contamination from either emission lines or active galactic nuclei components. Our results give excellent agreement with previous works, but extend their range by more than two decades in mass to 10(7.5) < M-s/h(-2) Mcircle dot less than or similar to 10(12). We present both a standard Schechter fit and a fit modified to include an extra, high-mass contribution, possibly from cluster central dominant galaxies. The Schechter fit parameters are (7.8 +/- 0.1) x 10(-3) h(3) Mpc(-3), M* = (7.64 +/- 0.09) x 10(10) h(-2) MD and alpha = -1.159 +/- 0.008. Our sample also yields an estimate for the contribution from baryons in stars to the critical density of Omega(b*)h = (2.39 +/- 0.08) x 10(-3), in good agreement with other indicators. Error bars are statistical and a Salpeter initial mass function is assumed throughout. We find no evolution of the mass function in the redshift range 0.05 < z < 0.34, indicating that almost all stars were already formed at z similar to 0.34 with little or no star formation activity since then and that the evolution seen in the luminosity function must be largely due to stellar fading.
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