The star formation rate at redshift one: Hα spectroscopy with CIRPASS
نویسندگان
چکیده
We have conducted an Hα 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-IR multi-object spectrograph Cambridge Infrared Panoramic Survey Spectrograph (CIRPASS) on the William Herschel Telescope (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 SFR density at redshift z = 1 of 0.04 M yr−1 Mpc−3. This implies rapid evolution in the SFR density from z = 0 to 1 which is proportional to (1 + z)3.1.
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