Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/25167
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Reeves, J. N. | en_US |
dc.contributor.author | Porquet, D. | en_US |
dc.contributor.author | BRAITO, Valentina | en_US |
dc.contributor.author | NARDINI, EMANUELE | en_US |
dc.contributor.author | Lobban, A. | en_US |
dc.contributor.author | Turner, T. J. | en_US |
dc.date.accessioned | 2020-05-26T09:15:09Z | - |
dc.date.available | 2020-05-26T09:15:09Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/25167 | - |
dc.description.abstract | The Seyfert 1 galaxy Ark 120 is a prototype example of the so-called class of bare nucleus active galactic nuclei (AGNs), whereby there is no known evidence for the presence of ionized gas along the direct line of sight. Here deep (>400 ks exposure), high-resolution X-ray spectroscopy of Ark 120 is presented from XMM-Newton observations that were carried out in 2014 March, together with simultaneous Chandra/High Energy Transmission Grating exposures. The high-resolution spectra confirmed the lack of intrinsic absorbing gas associated with Ark 120, with the only X-ray absorption present originating from the interstellar medium (ISM) of our own Galaxy, with a possible slight enhancement of the oxygen abundance required with respect to the expected ISM values in the solar neighborhood. However, the presence of several soft X-ray emission lines are revealed for the first time in the XMM-Newton RGS spectrum, associated with the AGN and arising from the He- and H-like ions of N, O, Ne, and Mg. The He-like line profiles of N, O, and Ne appear velocity broadened, with typical FWHMs of ∼5000 km s<SUP>-1</SUP>, whereas the H-like profiles are unresolved. From the clean measurement of the He-like triplets, we deduce that the broad lines arise from a gas of density n <SUB>e</SUB> ∼ 10<SUP>11</SUP> cm<SUP>-3</SUP>, while the photoionization calculations infer that the emitting gas covers at least 10% of 4π steradian. Thus the broad soft X-ray profiles appear coincident with an X-ray component of the optical-UV broad-line region on sub-parsec scales, whereas the narrow profiles originate on larger parsec scales, perhaps coincident with the AGN narrow-line region. The observations show that Ark 120 is not intrinsically bare and substantial X-ray-emitting gas exists out of our direct line of sight toward this AGN. | en_US |
dc.language.iso | eng | en_US |
dc.title | A Deep X-Ray View of the Bare AGN Ark 120. I. Revealing the Soft X-Ray Line Emission | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/828/2/98 | en_US |
dc.identifier.scopus | 2-s2.0-84991696876 | en_US |
dc.identifier.isi | 000384237800004 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/828/2/98 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/828/2/98/pdf | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 828 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 98 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 6 | en_US |
dc.description.international | sì | 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...828...98R | 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 | 2021-09-14T10:10:57.221+0200|||rp08926|||submit_approve|||dc_contributor_author|||None | * |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.openairetype | Article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0002-2629-4989 | - |
crisitem.author.orcid | 0000-0001-9226-8992 | - |
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