Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/34665
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Marchese, E. | en_US |
dc.contributor.author | DELLA CECA, Roberto | en_US |
dc.contributor.author | CACCIANIGA, Alessandro | en_US |
dc.contributor.author | SEVERGNINI, Paola | en_US |
dc.contributor.author | Corral, A. | en_US |
dc.contributor.author | Fanali, R. | en_US |
dc.date.accessioned | 2024-01-30T14:42:46Z | - |
dc.date.available | 2024-01-30T14:42:46Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/34665 | - |
dc.description.abstract | Context. Active galactic nuclei (AGN) emit radiation over a wide range of wavelengths, with a peak of emission in the far-UV region of the electromagnetic spectrum, a spectral region that is historically difficult to observe. Aims: Using optical, GALEX UV, and XMM-Newton data we derive the spectral energy distribution (SED) from the optical/UV to X-ray regime of a sizeable sample of AGN. The principal motivation is to investigate the relationship between the optical/UV emission and the X-ray emission and provide bolometric corrections to the hard X-ray (2-10 keV) energy range, kbol, the latter being a fundamental parameter in current physical cosmology. Methods: We construct and study the X-ray to optical SED of a sample of 195 X-ray selected Type 1 AGN belonging to the XMM-Newton bright serendipitous survey (XBS). The optical-UV luminosity was computed using data from the Sloan Digital Sky Survey (SDSS), from our own dedicated optical spectroscopy and the satellite GALaxy evolution EXplorer (GALEX), while the X-ray luminosity was computed using XMM-Newton data. Because it covers a wide range of redshift (0.03 < z ≲ 2.2), X-ray luminosities (41.8 < log L[2-10] keV < 45.5 erg/s) and because it is composed of "bright objects", this sample is ideal for this kind of investigation. Results: We confirm a highly significant correlation between the accretion disc luminosity Ldisc and the hard X-ray luminosity L[2-10] keV, in the form Ldisc ∝ Lβ[2-10] keV, where β = 1.18 ± 0.05. We find a very shallow dependence of kbol on the X-ray luminosity with respect to the broad distribution of values of kbol. We find a correlation between kbol and the hard X-ray photon index Γ2-10 keV and a tight correlation between the optical-to-X-ray spectral index αox and kbol, so we conclude that both Γ2-10 keV and αox can be used as a proxy for kbol. | en_US |
dc.language.iso | eng | en_US |
dc.title | The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201117562 | en_US |
dc.identifier.scopus | 2-s2.0-84857422729 | en_US |
dc.identifier.url | http://arxiv.org/abs/1111.4409v2 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2012/03/aa17562-11/aa17562-11.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 539 | en_US |
dc.relation.firstpage | A48 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 6 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | ESP | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2012A&A...539A..48M | 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 | O.A. Brera | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.orcid | 0000-0001-7551-2252 | - |
crisitem.author.orcid | 0000-0002-2339-8264 | - |
crisitem.author.orcid | 0000-0001-5619-5896 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
AA_2012_539_A48.pdf | PDF editoriale | 2.28 MB | Adobe PDF | View/Open |
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