Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26966
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Baronchelli, L. | en_US |
dc.contributor.author | Koss, M. | en_US |
dc.contributor.author | Schawinski, K. | en_US |
dc.contributor.author | Cardamone, C. | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Elvis, M. | en_US |
dc.contributor.author | LANZUISI, Giorgio | en_US |
dc.contributor.author | MARCHESI, STEFANO | en_US |
dc.contributor.author | Ricci, C. | en_US |
dc.contributor.author | Salvato, M. | en_US |
dc.contributor.author | Trakhtenbrot, B. | en_US |
dc.contributor.author | Treister, E. | en_US |
dc.date.accessioned | 2020-08-28T13:38:16Z | - |
dc.date.available | 2020-08-28T13:38:16Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26966 | - |
dc.description.abstract | To fully understand cosmic black hole growth, we need to constrain the population of heavily obscured active galactic nuclei (AGNs) at the peak of cosmic black hole growth (z ∼1-3). Sources with obscuring column densities higher than 10<SUP>24</SUP> atoms cm<SUP>-2</SUP>, called Compton-thick (CT) AGNs, can be identified by excess X-ray emission at ∼20-30 keV, called the 'Compton hump'. We apply the recently developed Spectral Curvature (SC) method to high-redshift AGNs (2 < z < 5) detected with Chandra. This method parametrizes the characteristic 'Compton hump' feature cosmologically redshifted into the X-ray band at observed energies <10 keV. We find good agreement in CT AGNs found using the SC method, and bright sources fit using their full spectrum with X-ray spectroscopy. In the Chandra Deep Field-South, we measure a CT fraction of 17^{+19}_{-11} per cent (3/17) for sources with observed luminosity >5 × 10<SUP>43</SUP>erg s<SUP>-1</SUP>. In the Cosmological Evolution Survey (COSMOS), we find an observed CT fraction of 15^{+4}_{-3} per cent (40/272) or 32 ± 11 per cent when corrected for the survey sensitivity. When comparing to low redshift AGNs with similar X-ray luminosities, our results imply that the CT AGN fraction is consistent with having no redshift evolution. Finally, we provide SC equations that can be used to find high-redshift CT AGNs (z > 1) for current (XMM-Newton) and future (eROSITA and ATHENA) X-ray missions. | en_US |
dc.language.iso | eng | en_US |
dc.title | Inferring Compton-thick AGN candidates at z > 2 with Chandra using the >8 keV rest-frame spectral curvature | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stx1561 | en_US |
dc.identifier.scopus | 2-s2.0-85045913985 | en_US |
dc.identifier.isi | 000408211700020 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/471/1/364/3892373 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 471 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 364 | en_US |
dc.relation.lastpage | 372 | en_US |
dc.relation.numberofpages | 9 | 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 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017MNRAS.471..364B | 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 | no | 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 | OAS Bologna | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
crisitem.author.orcid | 0000-0001-9094-0984 | - |
crisitem.author.orcid | 0000-0001-5544-0749 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stx1561.pdf | Pdf editoriale | 1.04 MB | Adobe PDF | View/Open |
1706.06588.pdf | preprint | 755.48 kB | Adobe PDF | View/Open |
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