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http://hdl.handle.net/20.500.12386/23384
Campo DC | Valore | Lingua |
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dc.contributor.author | SIDOLI, Lara | en_US |
dc.contributor.author | PAIZIS, ADAMANTIA | en_US |
dc.contributor.author | Fürst, F. | en_US |
dc.contributor.author | Torrejón, J. M. | en_US |
dc.contributor.author | Kretschmar, P. | en_US |
dc.contributor.author | Bozzo, E. | en_US |
dc.contributor.author | Pottschmidt, K. | en_US |
dc.date.accessioned | 2020-03-19T09:58:29Z | - |
dc.date.available | 2020-03-19T09:58:29Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/23384 | - |
dc.description | Based on observations with INTEGRAL , an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Spain and Switzerland), Czech Republic and Poland, and with the participation of Russia and the USA. This work has made use of the INTEGRAL archive developed at INAF-IASF Milano, http://www.iasf-milano.inaf.it/ ∼ada/GOLIA.html. We acknowledge support from ISSI through funding for the International Team on ‘Unified View of Stellar Winds in Massive X-ray Binaries’ (PI: S. Martínez-Nuez). LS thanks L. Oskinova for interesting discussions. JMT acknowledges grant AYA2010-15431. LS and AP acknowledge the Italian Space Agency financial support INTEGRAL ASI/INAF agreement no. 2013-025.R.0. | - |
dc.description.abstract | Vela X-1 is the prototype of the class of wind-fed accreting pulsars in high-mass X-ray binaries hosting a supergiant donor. We have analysed in a systematic way 10 years of INTEGRAL data of Vela X-1 (22-50 keV) and we found that when outside the X-ray eclipse, the source undergoes several luminosity drops where the hard X-rays luminosity goes below ̃3 × 10<SUP>35</SUP> erg s<SUP>-1</SUP>, becoming undetected by INTEGRAL. These drops in the X-ray flux are usually referred to as `off-states' in the literature. We have investigated the distribution of these off-states along the Vela X-1 ̃ 8.9 d orbit, finding that their orbital occurrence displays an asymmetric distribution, with a higher probability to observe an off-state near the pre-eclipse than during the post-eclipse. This asymmetry can be explained by scattering of hard X-rays in a region of ionized wind, able to reduce the source hard X-ray brightness preferentially near eclipse ingress. We associate this ionized large-scale wind structure with the photoionization wake produced by the interaction of the supergiant wind with the X-ray emission from the neutron star. We emphasize that this observational result could be obtained thanks to the accumulation of a decade of INTEGRAL data, with observations covering the whole orbit several times, allowing us to detect an asymmetric pattern in the orbital distribution of off-states in Vela X-1. | en_US |
dc.language.iso | eng | en_US |
dc.title | Probing large-scale wind structures in Vela X-1 using off-states with INTEGRAL | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stu2533 | en_US |
dc.identifier.scopus | 2-s2.0-84922569226 | en_US |
dc.identifier.isi | 000350272900022 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/447/2/1299/2593760 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 447 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1299 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 7 | en_US |
dc.description.international | sì | 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 | 2015MNRAS.447.1299S | 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 | IASF Milano | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.orcid | 0000-0001-9705-2883 | - |
crisitem.author.orcid | 0000-0001-5067-0377 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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