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The NuSTAR extragalactic survey : a first sensitive look at the high-energy cosmic X-ray background population.

Alexander, D.M. and Stern, D. and Del Moro, A. and Lansbury, G.B. and Assef, R.J. and Aird, J. and Ajello, M. and Ballantyne, D.R. and Bauer, F.E. and Boggs, S.E. and Brandt, W.N. and Christensen, F.E. and Civano, F. and Comastri, A. and Craig, W.W. and Elvis, M. and Grefenstette, B.W. and Hailey, C.J. and Harrison, F.A. and Hickox, R.C. and Luo, B. and Madsen, K.K. and Mullaney, J.R. and Perri, M. and Puccetti, S. and Saez, C. and Treister, E. and Urry, C.M. and Zhang, W.W. and Bridge, C.R. and Eisenhardt, P.R.M. and Gonzalez, A.H. and Miller, S.H. and Tsai, C.W. (2013) 'The NuSTAR extragalactic survey : a first sensitive look at the high-energy cosmic X-ray background population.', Astrophysical journal., 773 (2). p. 125.


We report on the first 10 identifications of sources serendipitously detected by the Nuclear Spectroscopic Telescope Array (NuSTAR) to provide the first sensitive census of the cosmic X-ray background source population at gsim 10 keV. We find that these NuSTAR-detected sources are ≈100 times fainter than those previously detected at gsim 10 keV and have a broad range in redshift and luminosity (z = 0.020-2.923 and L 10-40 keV ≈ 4 × 1041-5 × 1045 erg s–1); the median redshift and luminosity are z ≈ 0.7 and L 10-40 keV ≈ 3 × 1044 erg s–1, respectively. We characterize these sources on the basis of broad-band ≈0.5-32 keV spectroscopy, optical spectroscopy, and broad-band ultraviolet-to-mid-infrared spectral energy distribution analyses. We find that the dominant source population is quasars with L 10-40 keV > 1044 erg s–1, of which ≈50% are obscured with N H gsim 1022 cm–2. However, none of the 10 NuSTAR sources are Compton thick (N H gsim 1024 cm–2) and we place a 90% confidence upper limit on the fraction of Compton-thick quasars (L 10-40 keV > 1044 erg s–1) selected at gsim 10 keV of lsim 33% over the redshift range z = 0.5-1.1. We jointly fitted the rest-frame ≈10-40 keV data for all of the non-beamed sources with L 10-40 keV > 1043 erg s–1 to constrain the average strength of reflection; we find R < 1.4 for Γ = 1.8, broadly consistent with that found for local active galactic nuclei (AGNs) observed at gsim 10 keV. We also constrain the host-galaxy masses and find a median stellar mass of ≈1011 M ☉, a factor ≈5 times higher than the median stellar mass of nearby high-energy selected AGNs, which may be at least partially driven by the order of magnitude higher X-ray luminosities of the NuSTAR sources. Within the low source-statistic limitations of our study, our results suggest that the overall properties of the NuSTAR sources are broadly similar to those of nearby high-energy selected AGNs but scaled up in luminosity and mass.

Item Type:Article
Keywords:Galaxies: active, Galaxies: high-redshift, Infrared: galaxies, X-rays: diffuse background, X-rays: general.
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Publisher statement:© 2013. The American Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:23 June 2014
Date of first online publication:August 2013
Date first made open access:No date available

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