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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31207
DC FieldValueLanguage
dc.contributor.authorAnanna, TTen_US
dc.contributor.authorUrry, CMen_US
dc.contributor.authorTreister, Een_US
dc.contributor.authorHickox, RCen_US
dc.contributor.authorShankar, Fen_US
dc.contributor.authorRicci, Cen_US
dc.contributor.authorCappelluti, Nen_US
dc.contributor.authorMARCHESI, STEFANOen_US
dc.contributor.authorTurner, TJen_US
dc.date.accessioned2021-12-07T14:48:18Z-
dc.date.available2021-12-07T14:48:18Z-
dc.date.issued2020en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/20.500.12386/31207-
dc.description.abstractThe cosmic history of supermassive black hole (SMBH) growth is important for understanding galaxy evolution, reionization, and the physics of accretion. Recent NuSTAR, Swift-BAT, and Chandra hard X-ray surveys have provided new constraints on the space density of heavily obscured active galactic nuclei (AGNs). Using the new X-ray luminosity function derived from these data, we here estimate the accretion efficiency of SMBHs and their contribution to reionization. We calculate the total ionizing radiation from AGNs as a function of redshift, based on the X radiation and distribution of obscuring column density, converted to ultraviolet (UV) wavelengths. Limiting the luminosity function to unobscured AGNs only, our results agree with current UV luminosity functions of unobscured AGNs. For realistic assumptions about the escape fraction, the contribution of all AGNs to cosmic reionization is ∼4 times lower than the galaxy contribution (23% at z ∼6). Our results also offer an observationally constrained prescription that can be used in simulations or models of galaxy evolution. To estimate the average efficiency with which SMBHs convert mass to light, we compare the total radiated energy, converted from X-ray light using a bolometric correction, with the most recent local black hole mass density. The most likely value, η ∼ 0.3-0.34, approaches the theoretical limit for a maximally rotating Kerr black hole, η = 0.42, implying that on average growing SMBHs are spinning rapidly.en_US
dc.language.isoengen_US
dc.titleAccretion History of AGNs. III. Radiative Efficiency and AGN Contribution to Reionizationen_US
dc.typeArticle-
dc.identifier.doi10.3847/1538-4357/abb815en_US
dc.identifier.scopus2-s2.0-85096051285en_US
dc.identifier.isiWOS:000587031800001en_US
dc.identifier.urlhttps://iopscience.iop.org/article/10.3847/1538-4357/abb815en_US
dc.identifier.urlhttps://api.elsevier.com/content/abstract/scopus_id/85096051285en_US
dc.relation.mediumSTAMPAen_US
dc.relation.volume903en_US
dc.relation.issue2en_US
dc.relation.firstpage85en_US
dc.type.refereeREF_1en_US
dc.description.numberofauthors9en_US
dc.description.internationalsìen_US
dc.relation.scientificsectorFIS/05 - ASTRONOMIA E ASTROFISICAen_US
dc.relation.journalTHE ASTROPHYSICAL JOURNALen_US
dc.type.miur262 Articolo in rivista-
dc.identifier.adsbibcode2020ApJ...903...85Aen_US
dc.description.apcnoen_US
dc.description.oa1 – prodotto con file in versione Open Access (allegare il file al passo  5-Carica)en_US
item.cerifentitytypePublications-
item.grantfulltextopen-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairetypeArticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
crisitem.journal.journalissn0004-637X-
crisitem.journal.anceE016252-
crisitem.author.deptOAS Bologna-
crisitem.author.orcid0000-0001-5544-0749-
Appears in Collections:1.01 Articoli in rivista
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Ananna_2020_ApJ_903_85.pdf[Administrators only]880.28 kBAdobe PDF
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