Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24387
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Cracco, V. | en_US |
dc.contributor.author | Ciroi, S. | en_US |
dc.contributor.author | Berton, M. | en_US |
dc.contributor.author | Di Mille, F. | en_US |
dc.contributor.author | FOSCHINI, LUIGI | en_US |
dc.contributor.author | La Mura, G. | en_US |
dc.contributor.author | Rafanelli, P. | en_US |
dc.date.accessioned | 2020-04-30T15:36:47Z | - |
dc.date.available | 2020-04-30T15:36:47Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24387 | - |
dc.description.abstract | We revisited the spectroscopic characteristics of narrow-line Seyfert 1 galaxies (NLS1s) by analysing a homogeneous sample of 296 NLS1s at redshift between 0.028 and 0.345, extracted from the Sloan Digital Sky Survey (SDSS-DR7) public archive. We confirm that NLS1s are mostly characterized by Balmer lines with Lorentzian profiles, lower black hole masses and higher Eddington ratios than classic broad-line Seyfert 1 (BLS1s), but they also appear to be active galactic nuclei (AGNs) contiguous with BLS1s and sharing with them common properties. Strong Fe II emission does not seem to be a distinctive property of NLS1s, as low values of Fe II/Hβ are equally observed in these AGNs. Our data indicate that Fe II and Ca II kinematics are consistent with the one of Hβ. On the contrary, O I λ8446 seems to be systematically narrower and it is likely emitted by gas of the broad-line region more distant from the ionizing source and showing different physical properties. Finally, almost all NLS1s of our sample show radial motions of the narrow-line region highly ionized gas. The mechanism responsible for this effect is not yet clear, but there are hints that very fast outflows require high continuum luminosities (>10<SUP>44</SUP> erg s<SUP>-1</SUP>) or high Eddington ratios (log (L<SUB>bol</SUB>/L<SUB>Edd</SUB>) > -0.1). | en_US |
dc.language.iso | eng | en_US |
dc.title | A spectroscopic analysis of a sample of narrow-line Seyfert 1 galaxies selected from the Sloan Digital Sky Survey | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw1689 | en_US |
dc.identifier.scopus | 2-s2.0-84988892507 | en_US |
dc.identifier.isi | 000384674100008 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/462/2/1256/2589433 | en_US |
dc.identifier.url | https://arxiv.org/abs/1607.03438 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 462 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1256 | en_US |
dc.relation.lastpage | 1280 | en_US |
dc.relation.numberofpages | 24 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | no | en_US |
dc.contributor.country | ITA | 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 | 2016MNRAS.462.1256C | en_US |
dc.relation.ercsector | Scienze Fisiche Settori ERC (ERC) di riferimento::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 (allegherò 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.orcid | 0000-0001-8678-0324 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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