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We report the results of J-band infrared spectroscopy of a sample of 13 z 1 eld galaxies drawn from the CanadaFrance Redshift Survey, targeting galaxies with redshifts that place the rest-frame Ha line emission from H ii regions in between the bright night sky OH lines. As a result we detect emission down to a ux limit of .10 16 erg cm 2 s 1 , corresponding to a luminosity limit of .10 41 erg at this redshift for an H 0 50 km s 1 Mpc 1 , q 0 0:5 cosmology. From these luminosities we derive estimates of the star formation rates in these galaxies that are independent of previous estimates based upon their rest-frame ultraviolet (2800 A ) luminosity. The mean star formation rate at z 1, from this sample, is found to be at least three times as high as the ultraviolet estimates. The dust extinction in these galaxies is inferred to be moderate, for standard extinction laws, with a typical A V 0:51.0 mag, comparable to that of local eld galaxies. This suggests that the bulk of star formation is not heavily obscured, unless one uses greyer extinction laws.
Glazebrook et al. (Sun,) studied this question.