Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/25168
Campo DC | Valore | Lingua |
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dc.contributor.author | Reeves, J. N. | en_US |
dc.contributor.author | BRAITO, Valentina | en_US |
dc.contributor.author | NARDINI, EMANUELE | en_US |
dc.contributor.author | Behar, E. | en_US |
dc.contributor.author | O'Brien, P. T. | en_US |
dc.contributor.author | Tombesi, Francesco | en_US |
dc.contributor.author | Turner, T. J. | en_US |
dc.contributor.author | Costa, M. T. | en_US |
dc.date.accessioned | 2020-05-26T09:17:33Z | - |
dc.date.available | 2020-05-26T09:17:33Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/25168 | - |
dc.description.abstract | High-resolution soft X-ray spectroscopy of the prototype accretion disk wind quasar, PDS 456, is presented. Here, the XMM-Newton reflection grating spectrometer spectra are analyzed from the large 2013-2014 XMM-Newton campaign, consisting of five observations of approximately 100 ks in length. During the last observation (OBS. E), the quasar is at a minimum flux level, and broad absorption line (BAL) profiles are revealed in the soft X-ray band, with typical velocity widths of {σ }<SUB>{{v</SUB>}}̃ {{10,000}} km s<SUP>-1</SUP>. During a period of higher flux in the third and fourth observations (OBS. C and D, respectively), a very broad absorption trough is also present above 1 keV. From fitting the absorption lines with models of photoionized absorption spectra, the inferred outflow velocities lie in the range ̃ 0.1{--}0.2c. The absorption lines likely originate from He and H-like neon and L-shell iron at these energies. A comparison with earlier archival data of PDS 456 also reveals a similar absorption structure near 1 keV in a 40 ks observation in 2001, and generally the absorption lines appear most apparent when the spectrum is more absorbed overall. The presence of the soft X-ray BALs is also independently confirmed by an analysis of the XMM-Newton EPIC spectra below 2 keV. We suggest that the soft X-ray absorption profiles could be associated with a lower ionization and possibly clumpy phase of the accretion disk wind, where the latter is known to be present in this quasar from its well-studied iron K absorption profile and where the wind velocity reaches a typical value of 0.3c.... | en_US |
dc.language.iso | eng | en_US |
dc.title | Discovery of Broad Soft X-ray Absorption Lines from the Quasar Wind in PDS 456 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/824/1/20 | en_US |
dc.identifier.scopus | 2-s2.0-84976412166 | en_US |
dc.identifier.isi | 000377937300020 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/824/1/20 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/824/1/20/pdf | en_US |
dc.relation.medium | ELETTRONICO | en_US |
dc.relation.volume | 824 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 20 | en_US |
dc.type.referee | REF_1 | 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.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.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.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0002-2629-4989 | - |
crisitem.author.orcid | 0000-0001-9226-8992 | - |
crisitem.author.orcid | 0000-0002-6562-8654 | - |
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