Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26893
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Del Moro, A. | en_US |
dc.contributor.author | Alexander, D. M. | en_US |
dc.contributor.author | Aird, J. A. | en_US |
dc.contributor.author | Bauer, F. E. | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | Mullaney, J. R. | en_US |
dc.contributor.author | Ballantyne, D. R. | en_US |
dc.contributor.author | Brandt, W. N. | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Gandhi, P. | en_US |
dc.contributor.author | Harrison, F. A. | en_US |
dc.contributor.author | Lansbury, G. B. | en_US |
dc.contributor.author | Lanz, L. | en_US |
dc.contributor.author | Luo, B. | en_US |
dc.contributor.author | MARCHESI, STEFANO | en_US |
dc.contributor.author | Puccetti, S. | en_US |
dc.contributor.author | Ricci, C. | en_US |
dc.contributor.author | Saez, C. | en_US |
dc.contributor.author | Stern, D. | en_US |
dc.contributor.author | Treister, E. | en_US |
dc.contributor.author | ZAPPACOSTA, Luca | en_US |
dc.date.accessioned | 2020-08-27T14:05:11Z | - |
dc.date.available | 2020-08-27T14:05:11Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26893 | - |
dc.description.abstract | We present a study of the average X-ray spectral properties of the sources detected by the NuSTAR extragalactic survey, comprising observations of the Extended Chandra Deep Field South (E-CDFS), Extended Groth Strip (EGS), and the Cosmic Evolution Survey (COSMOS). The sample includes 182 NuSTAR sources (64 detected at 8-24 keV), with 3-24 keV fluxes ranging between {f}<SUB>3{--</SUB>24{keV}}≈ {10}<SUP>-14</SUP> and 6 × 10<SUP>-13</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP> ({f}<SUB>8{--</SUB>24{keV}}≈ 3× {10}<SUP>-14</SUP>{--}3× {10}<SUP>-13</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP>) and redshifts in the range of z=0.04{--}3.21. We produce composite spectra from the Chandra + NuSTAR data (E≈ 2{--}40 {keV}, rest frame) for all the sources with redshift identifications (95%) and investigate the intrinsic, average spectra of the sources, divided into broad-line (BL) and narrow-line (NL) active galactic nuclei (AGNs), and also in different bins of X-ray column density and luminosity. The average power-law photon index for the whole sample is {{Γ }}={1.65}<SUB>-0.03</SUB><SUP>+0.03</SUP>, flatter than the {{Γ }}≈ 1.8 typically found for AGNs. While the spectral slope of BL and X-ray unabsorbed AGNs is consistent with the typical values ({{Γ }}={1.79}<SUB>-0.01</SUB><SUP>+0.01</SUP>), a significant flattening is seen in NL AGNs and heavily absorbed sources ({{Γ }}={1.60}<SUB>-0.05</SUB><SUP>+0.08</SUP> and {{Γ }}={1.38}<SUB>-0.12</SUB><SUP>+0.12</SUP>, respectively), likely due to the effect of absorption and to the contribution from the Compton reflection component to the high-energy flux (E> 10 keV). We find that the typical reflection fraction in our spectra is R≈ 0.5 (for {{Γ }}=1.8), with a tentative indication of an increase of the reflection strength with X-ray column density. While there is no significant evidence for a dependence of the photon index on X-ray luminosity in our sample, we find that R decreases with luminosity, with relatively high levels of reflection (R≈ 1.2) for {L}<SUB>10{--</SUB>40{keV}}< {10}<SUP>44</SUP> erg s<SUP>-1</SUP> and R≈ 0.3 for {L}<SUB>10{--</SUB>40{keV}}> {10}<SUP>44</SUP> erg s<SUP>-1</SUP> AGNs, assuming a fixed spectral slope of {{Γ }}=1.8. | en_US |
dc.language.iso | eng | en_US |
dc.title | The NuSTAR Extragalactic Survey: Average Broadband X-Ray Spectral Properties of the NuSTAR-detected AGNs | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aa9115 | en_US |
dc.identifier.scopus | 2-s2.0-85033598740 | en_US |
dc.identifier.isi | 000414185700001 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aa9115 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 849 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 57 | en_US |
dc.relation.lastpage | 75 | en_US |
dc.relation.numberofpages | 19 | 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 | 2017ApJ...849...57D | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::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 (allegare 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 | OAS Bologna | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
crisitem.author.orcid | 0000-0001-5544-0749 | - |
crisitem.author.orcid | 0000-0002-4205-6884 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Del_Moro_2017_ApJ_849_57.pdf | pdf editoriale | 3.43 MB | Adobe PDF | View/Open |
1710.01041.pdf | preprint | 1.91 MB | Adobe PDF | View/Open |
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