Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26877
Campo DC | Valore | Lingua |
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dc.contributor.author | Lansbury, G. B. | en_US |
dc.contributor.author | Alexander, D. M. | en_US |
dc.contributor.author | Aird, J. | en_US |
dc.contributor.author | Gandhi, P. | en_US |
dc.contributor.author | Stern, D. | en_US |
dc.contributor.author | Koss, M. | en_US |
dc.contributor.author | Lamperti, I. | en_US |
dc.contributor.author | Ajello, M. | en_US |
dc.contributor.author | Annuar, A. | en_US |
dc.contributor.author | Assef, R. J. | en_US |
dc.contributor.author | Ballantyne, D. R. | en_US |
dc.contributor.author | Baloković, M. | en_US |
dc.contributor.author | Bauer, F. E. | en_US |
dc.contributor.author | Brandt, W. N. | en_US |
dc.contributor.author | Brightman, M. | en_US |
dc.contributor.author | Chen, C. -T. J. | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Del Moro, A. | en_US |
dc.contributor.author | Fuentes, C. | en_US |
dc.contributor.author | Harrison, F. A. | en_US |
dc.contributor.author | MARCHESI, STEFANO | en_US |
dc.contributor.author | Masini, A. | en_US |
dc.contributor.author | Mullaney, J. R. | en_US |
dc.contributor.author | Ricci, C. | en_US |
dc.contributor.author | Saez, C. | en_US |
dc.contributor.author | Tomsick, J. A. | en_US |
dc.contributor.author | Treister, E. | en_US |
dc.contributor.author | Walton, D. J. | en_US |
dc.contributor.author | Zappacosta, L. | en_US |
dc.date.accessioned | 2020-08-27T12:39:19Z | - |
dc.date.available | 2020-08-27T12:39:19Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26877 | - |
dc.description.abstract | We identify sources with extremely hard X-ray spectra (I.e., with photon indices of {{Γ }}≲ 0.6) in the 13 deg<SUP>2</SUP> NuSTAR serendipitous survey, to search for the most highly obscured active galactic nuclei (AGNs) detected at > 10 {keV}. Eight extreme NuSTAR sources are identified, and we use the NuSTAR data in combination with lower-energy X-ray observations (from Chandra, Swift XRT, and XMM-Newton) to characterize the broadband (0.5-24 keV) X-ray spectra. We find that all of the extreme sources are highly obscured AGNs, including three robust Compton-thick (CT; {N}<SUB>{{H</SUB>}}> 1.5× {10}<SUP>24</SUP> cm<SUP>-2</SUP>) AGNs at low redshift (z< 0.1) and a likely CT AGN at higher redshift (z = 0.16). Most of the extreme sources would not have been identified as highly obscured based on the low-energy (< 10 keV) X-ray coverage alone. The multiwavelength properties (e.g., optical spectra and X-ray-mid-IR luminosity ratios) provide further support for the eight sources being significantly obscured. Correcting for absorption, the intrinsic rest-frame 10-40 keV luminosities of the extreme sources cover a broad range, from ≈ 5× {10}<SUP>42</SUP> to 10<SUP>45</SUP> erg s<SUP>-1</SUP>. The estimated number counts of CT AGNs in the NuSTAR serendipitous survey are in broad agreement with model expectations based on previous X-ray surveys, except for the lowest redshifts (z< 0.07), where we measure a high CT fraction of {f}<SUB>{CT</SUB>}<SUP>{obs</SUP>}={30}<SUB>-12</SUB><SUP>+16</SUP> % . For the small sample of CT AGNs, we find a high fraction of galaxy major mergers (50% ± 33%) compared to control samples of “normal” AGNs. | en_US |
dc.language.iso | eng | en_US |
dc.title | The NuSTAR Serendipitous Survey: Hunting for the Most Extreme Obscured AGN at >10 keV | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aa8176 | en_US |
dc.identifier.scopus | 2-s2.0-85029043949 | en_US |
dc.identifier.isi | 000408362800020 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aa8176 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 846 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 20 | en_US |
dc.relation.lastpage | 38 | 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...846...20L | 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.fulltext | With Fulltext | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
crisitem.author.orcid | 0000-0001-5544-0749 | - |
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Lansbury_2017_ApJ_846_20.pdf | pdf editoriale | 2.63 MB | Adobe PDF | Visualizza/apri |
1707.06651.pdf | preprint | 3.99 MB | Adobe PDF | Visualizza/apri |
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