The star formation histories of galaxies in the Sloan Digital Sky Survey

Benjamin Panter, Raul Jimenez, Alan F. Heavens, Stephane Charlot

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a MOPED analysis of ∼3 × 105 galaxy spectra from the Sloan Digital Sky Survey Data Release 3 (SDSS DR3), with a number of improvements in data, modelling and analysis compared with our previous analysis of DR1. The improvements include: modelling the galaxies with theoretical models at a higher spectral resolution of 3 Å, better calibrated data, an extended list of excluded emission lines and a wider range of dust models. We present new estimates of the cosmic star formation rate (SFR), the evolution of stellar mass density and the stellar mass function from the fossil record. In contrast to our earlier work the results show no conclusive peak in the SFR out to a redshift around 2 but continue to show conclusive evidence for ‘downsizing’ in the SDSS fossil record. The star formation history is now in good agreement with more traditional instantaneous measures. The galaxy stellar mass function is determined over five decades of mass, and an updated estimate of the current stellar mass density is presented. We also investigate the systematic effects of changes in the stellar population modelling, the spectral resolution, dust modelling, sky lines, spectral resolution and the change of data set. We find that the main changes in the results are due to the improvements in the calibration of the SDSS data, changes in the initial mass function and the theoretical models used.
Original languageEnglish
Pages (from-to)1550-1564
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume378
Issue number4
Early online date16 Jun 2007
DOIs
Publication statusPublished - 11 Jul 2007

Keywords

  • galaxies : fundamental parameters
  • galaxies : statistics
  • galaxies : stellar content

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