THE <i>NuSTAR</i> EXTRAGALACTIC SURVEY: A FIRST SENSITIVE LOOK AT THE HIGH-ENERGY COSMIC X-RAY BACKGROUND POPULATION

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dc.contributor.authorAlexander, D. M.
dc.contributor.authorStern, D.
dc.contributor.authorDel Moro, A.
dc.contributor.authorLansbury, G. B.
dc.contributor.authorAssef, R. J.
dc.contributor.authorAird, J.
dc.contributor.authorAjello, M.
dc.contributor.authorBallantyne, D. R.
dc.contributor.authorBauer, F. E.
dc.contributor.authorBoggs, S. E.
dc.contributor.authorBrandt, W. N.
dc.contributor.authorChristensen, F. E.
dc.contributor.authorCivano, F.
dc.contributor.authorComastri, A.
dc.contributor.authorCraig, W. W.
dc.contributor.authorElvis, M.
dc.contributor.authorGrefenstette, B. W.
dc.contributor.authorHailey, C. J.
dc.contributor.authorHarrison, F. A.
dc.contributor.authorHickox, R. C.
dc.contributor.authorLuo, B.
dc.contributor.authorMadsen, K. K.
dc.contributor.authorMullaney, J. R.
dc.contributor.authorPerri, M.
dc.contributor.authorPuccetti, S.
dc.contributor.authorSaez, C.
dc.contributor.authorTreister, E.
dc.contributor.authorUrry, C. M.
dc.contributor.authorZhang, W. W.
dc.contributor.authorBridge, C. R.
dc.contributor.authorEisenhardt, P. R. M.
dc.contributor.authorGonzalez, A. H.
dc.contributor.authorMiller, S. H.
dc.contributor.authorTsai, C. W.
dc.date.accessioned2025-01-24T00:08:59Z
dc.date.available2025-01-24T00:08:59Z
dc.date.issued2013
dc.description.abstractWe 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 greater than or similar to 10 keV. We find that these NuSTAR-detected sources are approximate to 100 times fainter than those previously detected at greater than or similar to 10 keV and have a broad range in redshift and luminosity (z = 0.020-2.923 and L10-40 keV approximate to 4 x 10(41)-5 x 10(45) erg s(-1)); the median redshift and luminosity are z approximate to 0.7 and L10-40 keV approximate to 3 x 10(44) erg s(-1), respectively. We characterize these sources on the basis of broad-band approximate to 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 L10-40 keV > 10(44) erg s(-1), of which approximate to 50% are obscured with N-H greater than or similar to 10(22) cm(-2). However, none of the 10 NuSTAR sources are Compton thick (N-H greater than or similar to 10(24) cm(-2)) and we place a 90% confidence upper limit on the fraction of Compton-thick quasars (L10-40 keV > 10(44) erg s(-1)) selected at greater than or similar to 10 keV of less than or similar to 33% over the redshift range z = 0.5-1.1. We jointly fitted the rest-frame approximate to 10-40 keV data for all of the non-beamed sources with L10-40 keV > 10(43) erg s(-1) to constrain the average strength of reflection; we find R < 1.4 for Gamma = 1.8, broadly consistent with that found for local active galactic nuclei (AGNs) observed at greater than or similar to 10 keV. We also constrain the host-galaxy masses and find a median stellar mass of approximate to 10(11) M-circle dot, a factor approximate to 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.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/773/2/125
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.1088/0004-637X/773/2/125
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101977
dc.identifier.wosidWOS:000323426100044
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies: active
dc.subjectgalaxies: high-redshift
dc.subjectinfrared: galaxies
dc.subjectX-rays: diffuse background
dc.subjectX-rays: general
dc.titleTHE <i>NuSTAR</i> EXTRAGALACTIC SURVEY: A FIRST SENSITIVE LOOK AT THE HIGH-ENERGY COSMIC X-RAY BACKGROUND POPULATION
dc.typeartículo
dc.volumen773
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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