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http://hdl.handle.net/20.500.12386/25961
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | BALDI, RANIERI DIEGO | en_US |
dc.contributor.author | CAPETTI, Alessandro | en_US |
dc.contributor.author | Robinson, Andrew | en_US |
dc.contributor.author | Laor, Ari | en_US |
dc.contributor.author | Behar, Ehud | en_US |
dc.date.accessioned | 2020-06-08T16:13:28Z | - |
dc.date.available | 2020-06-08T16:13:28Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 1745-3925 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/25961 | - |
dc.description.abstract | Several studies indicate that radio-loud (RL) Active Galactic Nuclei (AGN) are produced only by the most massive black holes (BH), $M_{\rm BH} \sim 10^8$-$10^{10} M_\odot$. This idea has been challenged by the discovery of RL Narrow Line Seyfert 1 (RL NLSy1), having estimated masses of $M_{\rm BH}$$\sim$$10^6$-$10^7$ M$_\odot$. However, these low $M_{\rm BH}$ estimates might be due to projection effects. Spectropolarimetry allows us to test this possibility by looking at RL NLSy1s under a different perspective, i.e., from the viewing angle of the scattering material. We here report the results of a pilot study of VLT spectropolarimetric observations of the RL NLSy1 PKS 2004-447. Its polarization properties are remarkably well reproduced by models in which the scattering occurs in an equatorial structure surrounding its broad line region, seen close to face-on. In particular, we detect a polarized H$\alpha$ line with a width of $\sim$ 9,000 km s$^{-1}$, $\sim 6$ times broader than the width seen in direct light. This corresponds to a revised estimate of $M_{\rm BH}$$\sim$$6\times10^8$ M$_\odot$, well within the typical range of RL AGN. The double-peaked polarized broad H$\alpha$ profile of the target suggests that the rare combination of the orientation effects and a broad line region dominated by the rotation might account for this class of objects, casting doubts on the virial estimates of BH mass for type-I AGN. | en_US |
dc.language.iso | eng | en_US |
dc.title | Radio-loud Narrow Line Seyfert 1 under a different perspective: a revised black hole mass estimate from optical spectropolarimetry | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnrasl/slw019 | en_US |
dc.identifier.scopus | 2-s2.0-84963527104 | en_US |
dc.identifier.isi | 000374226300015 | en_US |
dc.identifier.url | http://arxiv.org/abs/1602.02783v1 | en_US |
dc.identifier.url | https://academic.oup.com/mnrasl/article/458/1/L69/2589618 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 458 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | L69 | en_US |
dc.relation.lastpage | L73 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | 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. LETTERS | en_US |
dc.type.miur | 262 Articolo in rivista | en_US |
dc.identifier.adsbibcode | 2016MNRAS.458L..69B | 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 |
local.message.claim | 2022-04-19T09:59:20.573+0200|||rp09314|||submit_approve|||dc_contributor_author|||None | * |
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 | IRA Bologna | - |
crisitem.author.dept | O.A. Torino | - |
crisitem.author.orcid | 0000-0002-1824-0411 | - |
crisitem.author.orcid | 0000-0003-3684-4275 | - |
crisitem.journal.journalissn | 1745-3925 | - |
crisitem.journal.ance | E205843 | - |
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