Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31891
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Boutsia, Konstantina | - |
dc.contributor.author | GRAZIAN, Andrea | - |
dc.contributor.author | FONTANOT, Fabio | - |
dc.contributor.author | GIALLONGO, Emanuele | - |
dc.contributor.author | MENCI, Nicola | - |
dc.contributor.author | CALDERONE, GIORGIO | - |
dc.contributor.author | CRISTIANI, Stefano | - |
dc.contributor.author | D'ODORICO, Valentina | - |
dc.contributor.author | CUPANI, Guido | - |
dc.contributor.author | GUARNERI, FRANCESCO | - |
dc.contributor.author | Omizzolo, Alessandro | - |
dc.date.accessioned | 2022-03-24T15:47:07Z | - |
dc.date.available | 2022-03-24T15:47:07Z | - |
dc.date.issued | 2021 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31891 | - |
dc.description.abstract | Based on results by recent surveys, the number of bright quasars at redshifts z > 3 is being constantly revised upward. The current consensus is that at bright magnitudes (M<SUB>1450</SUB> ≤ -27) the number densities of such sources could have been underestimated by a factor of 30%-40%. In the framework of the QUBRICS survey, we identified 58 bright QSOs at 3.6 ≤ z ≤ 4.2, with magnitudes i<SUB>psf</SUB> ≤ 18, in an area of 12400 deg<SUP>2</SUP>. The uniqueness of our survey is underlined by the fact that it allows us, for the first time, to extend the sampled absolute magnitude range up to M<SUB>1450</SUB> = -29.5. We derived a bright-end slope of β = -4.025 and a space density at <M<SUB>1450</SUB>> = -28.75 of 2.61 × 10<SUP>-10</SUP> Mpc<SUP>-3</SUP> comoving, after taking into account the estimated incompleteness of our observations. Taking into account the results of fainter surveys, active galactic nuclei (AGNs) brighter than M<SUB>1450</SUB> = -23 could produce at least half of the ionizing emissivity at z ∼ 4. Considering a mean escape fraction of 0.7 for the QSO and AGN population, combined with a mean free path of 41.3 proper Mpc at z = 3.9, we derive a photoionization rate of ${\rm{Log}}({\rm{\Gamma }}\left[{{\rm{s}}}^{-1}\right])=-{12.17}_{-0.07}^{+0.13}$ , produced by AGNs at M<SUB>1450</SUB> < -18, that is, ∼100% of the measured ionizing background at z ∼ 4. | - |
dc.language.iso | eng | - |
dc.title | The Luminosity Function of Bright QSOs at z ∼ 4 and Implications for the Cosmic Ionizing Background | - |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/abedb5 | - |
dc.identifier.scopus | 2-s2.0-85106206565 | - |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/abedb5 | - |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/85106206565 | - |
dc.relation.medium | STAMPA | - |
dc.relation.volume | 912 | - |
dc.relation.issue | 2 | - |
dc.relation.firstpage | 111 | - |
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 | 2021ApJ...912..111B | - |
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. Trieste | - |
crisitem.author.dept | O.A. Roma | - |
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 | 0000-0003-4744-0188 | - |
crisitem.author.orcid | 0000-0003-0734-1273 | - |
crisitem.author.orcid | 0000-0002-4096-2680 | - |
crisitem.author.orcid | 0000-0002-7738-5389 | - |
crisitem.author.orcid | 0000-0002-2115-5234 | - |
crisitem.author.orcid | 0000-0003-3693-3091 | - |
crisitem.author.orcid | 0000-0002-6830-9093 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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