Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/28417
Campo DC | Valore | Lingua |
---|---|---|
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 | Hamann, F. | en_US |
dc.contributor.author | Chartas, G. | en_US |
dc.contributor.author | Lobban, A. P. | en_US |
dc.contributor.author | O'Brien, P. T. | en_US |
dc.contributor.author | Turner, T. J. | en_US |
dc.date.accessioned | 2020-11-18T14:35:10Z | - |
dc.date.available | 2020-11-18T14:35:10Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28417 | - |
dc.description.abstract | Simultaneous XMM-Newton, NuSTAR, and HST observations, performed in 2017 March, of the nearby (z = 0.184) luminous quasar PDS 456 are presented. PDS 456 had a low X-ray flux compared to past observations, where the first of the two new XMM-Newton observations occurred during a pronounced dip in the X-ray light curve. The broadband X-ray spectrum is highly absorbed, attenuated by a soft X-ray absorber of column density N <SUB>H</SUB> = 6 × 10<SUP>22</SUP> cm<SUP>-2</SUP>. An increase in obscuration occurs during the dip, which may be due to an X-ray eclipse. In addition, the persistent, fast Fe K outflow is present, with velocity components of -0.25c and -0.4c. The soft absorber is less ionized ({log}ξ =3) compared to the iron K outflow ({log}ξ =5) and is outflowing with a velocity of approximately -0.2c. A soft X-ray excess is present below 1 keV against the highly absorbed continuum and can be attributed to the re-emission from a wide-angle wind. The complex X-ray absorption present in PDS 456 suggests that the wind is inhomogeneous, whereby the soft X-ray absorber originates from denser clumps or filaments that may form farther out along the outflow. In contrast to the X-ray observations, the simultaneous UV spectrum of PDS 456 is largely unabsorbed, where only a very weak broad absorption trough is present blueward of Lyα, compared to a past observation in 2000 when the trough was significantly stronger. The relative weakness of the UV absorption may be due to the soft X-ray absorber being too highly ionized and almost transparent in the UV band. | en_US |
dc.language.iso | eng | en_US |
dc.title | Resolving the X-Ray Obscuration in a Low-flux Observation of the Quasar PDS 456 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aae30c | en_US |
dc.identifier.scopus | 2-s2.0-85056079384 | en_US |
dc.identifier.isi | 000448736000005 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aae30c | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 867 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 38 | 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.identifier.adsbibcode | 2018ApJ...867...38R | 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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
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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