X-ray and Radio Emission from Uv-selected Star Forming Galaxies at Redshifts 1.5 ∼< Z ∼< 3.0 in the Goods-north Field

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 Msec survey and the Very Large Array, respectively. There is a good agreement between the Xray, radio, and de-reddened UV estimates of the average SFR for our sample of z ∼ 2 galaxies of ∼ 50 M⊙ yr , 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. Subject headings: galaxies: evolution—-galaxies: high-redshift—galaxies: starburst—dust, extinction—radio continuum: galaxies—X-rays: galaxies