X-ray inferred bolometric star-formation rates of UV-selected galaxies at z ~ 2

Astronomy and Astrophysics – Astrophysics

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Scientific paper

We have examined the stacked radio and X-ray emission from UV-selected galaxies spectroscopically confirmed to lie between redshifts 1.5 < z < 3.0 in the GOODS-North field to determine their average extinction and star-formation rates (SFRs). The X-ray and radio data are obtained from the Chandra 2 Ms survey and the Very Large Array, respectively. There is a good agreement between the X-ray, radio, and de-reddened UV estimates of the average SFR for our sample of z˜2 galaxies of ˜ 50 M&sun; yr-1, indicating that the locally-calibrated SFR relations appear to be statistically valid from redshifts 1.5 < z < 3.0. We find that UV-estimated SFRs (uncorrected for extinction) underestimate the bolometric SFRs as determined from the 2-10 keV X-ray luminosity by a factor of ˜ 4.5 - 5.0 for galaxies over a large range in redshift from 1.0 < z < 3.5.

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