Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26350
DC Field | Value | Language |
---|---|---|
dc.contributor.author | MARCHESI, STEFANO | en_US |
dc.contributor.author | LANZUISI, Giorgio | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | Iwasawa, K. | en_US |
dc.contributor.author | Suh, H. | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Zamorani, G. | en_US |
dc.contributor.author | Allevato, V. | en_US |
dc.contributor.author | Griffiths, R. | en_US |
dc.contributor.author | Miyaji, T. | en_US |
dc.contributor.author | Ranalli, P. | en_US |
dc.contributor.author | Salvato, M. | en_US |
dc.contributor.author | Schawinski, K. | en_US |
dc.contributor.author | Silverman, J. | en_US |
dc.contributor.author | Treister, E. | en_US |
dc.contributor.author | Urry, C. M. | en_US |
dc.contributor.author | Vignali, C. | en_US |
dc.date.accessioned | 2020-07-06T18:07:26Z | - |
dc.date.available | 2020-07-06T18:07:26Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26350 | - |
dc.description.abstract | We present the X-ray spectral analysis of the 1855 extragalactic sources in the Chandra COSMOS-Legacy survey catalog having more than 30 net counts in the 0.5-7 keV band. A total of 38% of the sources are optically classified type 1 active galactic nuclei (AGNs), 60% are type 2 AGNs, and 2% are passive, low-redshift galaxies. We study the distribution of AGN photon index Γ and of the intrinsic absorption {N}<SUB>{{H</SUB>},{{z}}} based on the sources’ optical classification: type 1 AGNs have a slightly steeper mean photon index Γ than type 2 AGNs, which, on the other hand, have average {N}<SUB>{{H</SUB>},{{z}}} ∼ 3 times higher than type 1 AGNs. We find that ∼15% of type 1 AGNs have {N}<SUB>{{H</SUB>},{{z}}}\gt {10}<SUP>22</SUP> cm<SUP>-2</SUP>, I.e., are obscured according to the X-ray spectral fitting; the vast majority of these sources have {L}<SUB>2{--</SUB>10{keV}} \gt 10<SUP>44</SUP> erg s<SUP>-1</SUP>. The existence of these objects suggests that optical and X-ray obscuration can be caused by different phenomena, the X-ray obscuration being, for example, caused by dust-free material surrounding the inner part of the nuclei. Approximately 18% of type 2 AGNs have {N}<SUB>{{H</SUB>},{{z}}}\lt {10}<SUP>22</SUP> cm<SUP>-2</SUP>, and most of these sources have low X-ray luminosities (L {}<SUB>2{--</SUB>10{keV}} \lt 10<SUP>43</SUP> erg s<SUP>-1</SUP>). We expect a part of these sources to be low-accretion, unobscured AGNs lacking broad emission lines. Finally, we also find a direct proportional trend between {N}<SUB>{{H</SUB>},{{z}}} and host-galaxy mass and star formation rate, although part of this trend is due to a redshift selection effect. | en_US |
dc.language.iso | eng | en_US |
dc.title | The Chandra COSMOS-Legacy Survey: Source X-Ray Spectral Properties | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/830/2/100 | en_US |
dc.identifier.scopus | 2-s2.0-84994029475 | en_US |
dc.identifier.isi | 000386488200003 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/830/2/100 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 830 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 100 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 17 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.contributor.country | DEU | en_US |
dc.contributor.country | ESP | en_US |
dc.contributor.country | CHL | en_US |
dc.contributor.country | FIN | en_US |
dc.contributor.country | JPN | en_US |
dc.contributor.country | MEX | en_US |
dc.contributor.country | SWE | en_US |
dc.contributor.country | CHE | 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 | 2016ApJ...830..100M | 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 | 0000-0001-5544-0749 | - |
crisitem.author.orcid | 0000-0001-9094-0984 | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Marchesi_2016_ApJ_830_100.pdf | Pdf editoriale | 1.89 MB | Adobe PDF | View/Open |
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