The star formation rate at redshift one: H-alpha spectroscopy with CIRPASS
Michelle Doherty, Andrew Bunker, Robert Sharp, Gavin Dalton, Ian Parry, Ian Lewis
Abstract
We have conducted an H-alpha survey of 38 0.77<z<1 galaxies over ~100 arcmin2 of the Hubble Deep Field North and Flanking Fields, to determine star formation rates (SFRs), with the near-infrared multi-object spectrograph CIRPASS on the WHT. This represents the first successful application of this technique to observing high redshift galaxies. Stacking the spectra in the rest-frame to infer a total SFR for the field, we find a lower limit (uncorrected for dust reddening) on the star formation rate density at redshift z = 1 of 0.04Msol/yr/Mpc3. This implies rapid evolution in the star formation rate density from z = 0 to z = 1 which is proportional to (1+z)3.1.
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