Deposited in DRO : 04 September 2013 Version of attached le : Published Version Peer-review status of attached le : Peer-reviewed Citation for published item

We use deep far-IR, submillimeter, radio, and X-ray imaging and mid-IR spectroscopy to explore the nature of a sample of Spitzer-selected dust-obscured galaxies (DOGs) in GOODS-N. A sample of 79 galaxies satisfy the criteria R 1⁄224 > 14 (Vega) down to S24 > 100 Jy (median flux density S24 1⁄4 180 Jy). Twelve of these galaxies have IRS spectra available, which we use to measure redshifts and classify these objects as being dominated by star formation or active galactic nucleus (AGN) activity in the mid-IR. The IRS spectra and Spitzer photometric redshifts confirm that the DOGs lie in a tight redshift distribution around z 2. Based on mid-IR colors, 80% of DOGs are likely dominated by star formation; the stackedX-ray emission from this subsample of DOGs is also consistentwith star formation. Since only a small number of DOGs are individually detected at far-IR and submillimeter wavelengths, we use a stacking analysis to determine the average flux from these objects and plot a composite IR (8Y1000 m) spectral energy distribution (SED). The average luminosity of these star-forming DOGs is LIR 1 ; 10 L . We compare the average star-formingDOG to the average bright (S850 > 5mJy) submillimeter galaxy (SMG); the S24 > 100 JyDOGs are 3 times more numerous but 8 times less luminous in the IR. The far-IR SED shape of DOGs is similar to that of SMGs (average dust temperature of around 30 K), but DOGs have a higher mid-IRYtoYfar-IR flux ratio. The average star formationYdominatedDOG has a star formation rate of 200 M yr 1, which, given their space density, amounts to a contribution of 0.01 M yr 1 Mpc 3 (or 5%Y10%) to the star formation rate density at z 2. Subject headinggs: galaxies: active — galaxies: evolution — galaxies: starburst — infrared: galaxies — submillimeter — X-rays: galaxies Online material: color figures