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 μm  fluxes to measure SFRs, and 24 μm  fluxes and Hδ  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.

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