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Elvis, M. Perri, P. R. M. Eisenhardt, R. C. Hickox, R. J. Assef, S. E. Boggs, S. H. Miller, S. Puccetti, W. N. Brandt, W. W. Craig, W. W. Zhang","submitted_at":"2013-07-05T22:41:00Z","abstract_excerpt":"We report on the first ten identifications of sources serendipitously detected by the NuSTAR to provide the first sensitive census of the cosmic X-ray background (CXB) source population at >10 keV. We find that these NuSTAR-detected sources are ~100x fainter than those previously detected at >10 keV and have a broad range in redshift and luminosity (z=0.020-2.923 and L_10-40 keV~4x10^{41}-5x10^{45} erg/s); the median redshift and luminosity are z~0.7 and L_10-40 keV~3x10^{44} erg/s, respectively. 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