Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31894
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | GRAZIAN, Andrea | - |
dc.contributor.author | GIALLONGO, Emanuele | - |
dc.contributor.author | Boutsia, Konstantina | - |
dc.contributor.author | CALDERONE, GIORGIO | - |
dc.contributor.author | CRISTIANI, Stefano | - |
dc.contributor.author | CUPANI, Guido | - |
dc.contributor.author | FONTANOT, Fabio | - |
dc.contributor.author | GUARNERI, FRANCESCO | - |
dc.contributor.author | Ozdalkiran, Yacob | - |
dc.date.accessioned | 2022-03-24T15:52:37Z | - |
dc.date.available | 2022-03-24T15:52:37Z | - |
dc.date.issued | 2022 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31894 | - |
dc.description.abstract | Motivated by evidences favoring a rapid and late hydrogen reionization process completing at z ∼ 5.2-5.5 and mainly driven by rare and luminous sources, we have reassessed the estimate of the space density of ultra-luminous QSOs at z ∼ 5 in the framework of the QUBRICS survey. A ∼ 90% complete sample of 14 spectroscopically confirmed QSOs at M 1450 ≤ -28.3 and 4.5 ≤ z ≤ 5.0 has been derived in an area of 12,400 deg2, thanks to multiwavelength selection and Gaia astrometry. The space density of z ∼ 5 QSOs within -29.3 ≤ M 1450 ≤ -28.3 is three times higher than previous determinations. Our results suggest a steep bright-end slope for the QSO luminosity function at z ∼ 5 and a mild redshift evolution of the space density of ultrabright QSOs (M 1450 ∼ -28.5) at 3 < z < 5.5, in agreement with the redshift evolution of the much fainter active galactic nucleus (AGN) population at M 1450 ∼ -23. These findings are consistent with a pure density evolution for the AGN population at z > 3. Adopting our z ∼ 4 QSO luminosity function and applying a mild density evolution in redshift, a photoionization rate of has been obtained at z = 4.75, assuming an escape fraction of ∼70% and a steep faint-end slope of the AGN luminosity function. The derived photoionization rate is ∼50-100% of the ionizing background measured at the end of the reionization epoch, suggesting that AGNs could play an important role in the cosmological reionization process. | - |
dc.language.iso | eng | - |
dc.title | The Space Density of Ultra-luminous QSOs at the End of Reionization Epoch by the QUBRICS Survey and the AGN Contribution to the Hydrogen Ionizing Background | - |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/ac33a4 | - |
dc.identifier.scopus | 2-s2.0-85123528056 | - |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/ac33a4 | - |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/85123528056 | - |
dc.relation.medium | STAMPA | - |
dc.relation.volume | 924 | - |
dc.relation.issue | 2 | - |
dc.relation.firstpage | 62 | - |
dc.type.referee | REF_1 | - |
dc.description.international | sì | - |
dc.contributor.country | ITA | - |
dc.contributor.country | USA | - |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | - |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | - |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2022ApJ...924...62G | - |
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 | - |
dc.description.apc | no | - |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | - |
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 | O.A. Padova | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.orcid | 0000-0002-5688-0663 | - |
crisitem.author.orcid | 0000-0003-0734-1273 | - |
crisitem.author.orcid | 0000-0002-7738-5389 | - |
crisitem.author.orcid | 0000-0002-2115-5234 | - |
crisitem.author.orcid | 0000-0002-6830-9093 | - |
crisitem.author.orcid | 0000-0003-4744-0188 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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