Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24431
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Harrison, F. A. | en_US |
dc.contributor.author | Aird, J. | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | Lansbury, G. | en_US |
dc.contributor.author | Mullaney, J. R. | en_US |
dc.contributor.author | Ballantyne, D. R. | en_US |
dc.contributor.author | Alexander, D. M. | en_US |
dc.contributor.author | Stern, D. | en_US |
dc.contributor.author | Ajello, M. | en_US |
dc.contributor.author | Barret, D. | en_US |
dc.contributor.author | Bauer, F. E. | en_US |
dc.contributor.author | Baloković, M. | en_US |
dc.contributor.author | Brandt, W. N. | en_US |
dc.contributor.author | Brightman, M. | en_US |
dc.contributor.author | Boggs, S. E. | en_US |
dc.contributor.author | Christensen, F. E. | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Craig, W. W. | en_US |
dc.contributor.author | Del Moro, A. | en_US |
dc.contributor.author | Forster, K. | en_US |
dc.contributor.author | Gandhi, P. | en_US |
dc.contributor.author | Giommi, P. | en_US |
dc.contributor.author | Grefenstette, B. W. | en_US |
dc.contributor.author | Hailey, C. J. | en_US |
dc.contributor.author | Hickox, R. C. | en_US |
dc.contributor.author | Hornstrup, A. | en_US |
dc.contributor.author | Kitaguchi, T. | en_US |
dc.contributor.author | Koglin, J. | en_US |
dc.contributor.author | Luo, B. | en_US |
dc.contributor.author | Madsen, K. K. | en_US |
dc.contributor.author | Mao, P. H. | en_US |
dc.contributor.author | Miyasaka, H. | en_US |
dc.contributor.author | Mori, K. | en_US |
dc.contributor.author | PERRI, Matteo | en_US |
dc.contributor.author | Pivovaroff, M. | en_US |
dc.contributor.author | Puccetti, S. | en_US |
dc.contributor.author | Rana, V. | en_US |
dc.contributor.author | Treister, E. | en_US |
dc.contributor.author | Walton, D. | en_US |
dc.contributor.author | Westergaard, N. J. | en_US |
dc.contributor.author | Wik, D. | en_US |
dc.contributor.author | ZAPPACOSTA, Luca | en_US |
dc.contributor.author | Zhang, W. W. | en_US |
dc.contributor.author | Zoglauer, A. | en_US |
dc.date.accessioned | 2020-05-04T13:01:39Z | - |
dc.date.available | 2020-05-04T13:01:39Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24431 | - |
dc.description.abstract | We present the 3-8 keV and 8-24 keV number counts of active galactic nuclei (AGNs) identified in the Nuclear Spectroscopic Telescope Array (NuSTAR) extragalactic surveys. NuSTAR has now resolved 33%-39% of the X-ray background in the 8-24 keV band, directly identifying AGNs with obscuring columns up to ∼ {10}<SUP>25</SUP> {{cm}}<SUP>-2</SUP>. In the softer 3-8 keV band the number counts are in general agreement with those measured by XMM-Newton and Chandra over the flux range 5× {10}<SUP>-15</SUP> ≲ S(3-8 keV)/{erg} {{{s}}}<SUP>-1</SUP> {{cm}}<SUP>-2</SUP> ≲ {10}<SUP>-12</SUP> probed by NuSTAR. In the hard 8-24 keV band NuSTAR probes fluxes over the range 2× {10}<SUP>-14</SUP> ≲ S(8-24 keV)/{erg} {{{s}}}<SUP>-1</SUP> {{cm}}<SUP>-2</SUP> ≲ {10}<SUP>-12</SUP>, a factor ∼100 fainter than previous measurements. The 8-24 keV number counts match predictions from AGN population synthesis models, directly confirming the existence of a population of obscured and/or hard X-ray sources inferred from the shape of the integrated cosmic X-ray background. The measured NuSTAR counts lie significantly above simple extrapolation with a Euclidian slope to low flux of the Swift/BAT 15-55 keV number counts measured at higher fluxes (S(15-55 keV) ≳ 10<SUP>-11</SUP> {erg} {{{s}}}<SUP>-1</SUP> {{cm}}<SUP>-2</SUP>), reflecting the evolution of the AGN population between the Swift/BAT local (z\lt 0.1) sample and NuSTAR’s z∼ 1 sample. CXB synthesis models, which account for AGN evolution, lie above the Swift/BAT measurements, suggesting that they do not fully capture the evolution of obscured AGNs at low redshifts. | en_US |
dc.language.iso | eng | en_US |
dc.title | The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-Ray Background | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/831/2/185 | en_US |
dc.identifier.scopus | 2-s2.0-84994496756 | en_US |
dc.identifier.isi | 000400474400005 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/831/2/185 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 831 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 185 | en_US |
dc.relation.lastpage | 192 | en_US |
dc.relation.numberofpages | 8 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...831..185H | en_US |
dc.relation.ercsector | Scienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | sì | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegherò il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
crisitem.author.orcid | 0000-0003-3613-4409 | - |
crisitem.author.orcid | 0000-0002-4205-6884 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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1511.04183.pdf | postprint | 374 kB | Adobe PDF | Visualizza/apri |
Harrison_2016_ApJ_831_185.pdf | pdf editoriale | 582.47 kB | Adobe PDF | Visualizza/apri |
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