EVOLUTION OF THE RATE AND MODE OF STAR FORMATION IN GALAXIES SINCE z = 0.7

We present the star formation rate (SFR) and starburst fraction (SBF) for a sample of field galaxies from the Inamori-Magellan Areal Camera and Spectrograph Cluster Building Survey intermediate-redshift cluster survey. We use [O II] and Spitzer 24 {mu}m fluxes to measure SFRs, and 24 {mu}m fluxes an...

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Bibliographic Details
Published in:The Astrophysical journal 2009-07, Vol.699 (2)
Main Authors: Dressler, Alan, Oemler, Augustus, Bai Lei, Rigby, Jane R., Gladders, Michael G., Poggianti, Bianca M.
Format: Article
Language:English
Subjects:
ABSORPTION
AMPLITUDES
CAMERAS
GALACTIC EVOLUTION
GALAXIES
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
RED SHIFT
STARS
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Summary:We present the star formation rate (SFR) and starburst fraction (SBF) for a sample of field galaxies from the Inamori-Magellan Areal Camera and Spectrograph Cluster Building Survey intermediate-redshift cluster survey. We use [O II] and Spitzer 24 {mu}m fluxes to measure SFRs, and 24 {mu}m fluxes and H{delta} absorption to measure SBFs, for both our sample and a present-epoch field sample from the Sloan Digital Sky Survey and Spitzer Wide-area Infrared Extragalactic survey. We find a precipitous decline in the SFR since z = 1, in agreement with other studies, as well as a corresponding rapid decline in the fraction of galaxies undergoing long-duration moderate-amplitude starbursts. We suggest that the change in both the rate and mode of star formation could result from the strong decrease since z = 1 of gas available for star formation.
ISSN:1538-4357
1538-4357
DOI:10.1088/0004-637X/699/2/L130;COUNTRYOFINPUT:INTERNATIONALATOMICENERGYAGENCY(IAEA)