Highly structured wind in Vela X-1

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dc.contributor.authorKreykenbohm, Ingo
dc.contributor.authorWilms, Jörn
dc.contributor.authorKretschmar, Peter
dc.contributor.authorTorrejón, José Miguel
dc.contributor.authorPottschmidt, Katja
dc.contributor.authorHanke, Manfred
dc.contributor.authorSantangelo, Andrea
dc.contributor.authorFerrigno, Carlo
dc.contributor.authorStaubert, Rüdiger
dc.date.accessioned2021-06-04T19:46:54Z
dc.date.available2021-06-04T19:46:54Z
dc.date.issued2008-09-08
dc.description7th INTEGRAL Workshop – An INTEGRAL View of Compact Objects; September 8–11 2008, Copenhagen, Denmarken_US
dc.description.abstractWe present an in-depth analysis of the spectral and temporal behavior of a long almost uninterrupted INTEGRAL observation of Vela X-1 in Nov/Dec 2003. In addition to an already high activity level, Vela X-1 exhibited several very intense flares with a maximum intensity of more than 5 Crab in the 20–40 keV band. Furthermore Vela X-1 exhibited several off states where the source became undetectable with ISGRI. We interpret flares and off states as being due to the strongly structured wind of the optical companion: when Vela X-1 encounters a cavity in the wind with strongly reduced density, the flux drops, thus potentially triggering the onset of the propeller effect which inhibits further accretion, thus giving rise to the off states. The required drop in density to trigger the propeller effect in Vela X-1 is of the same order as predicted by theoretical papers for the densities in the OB star winds. The same structured wind can give rise to the giant flares when Vela X-1 encounters a dense blob in the wind. Further temporal analysis reveals that a short lived QPO with a period of 6800 sec is present. The part of the light curve during which the QPO is present is very close to the off states and just following a high intensity state, thus showing that all these phenomena are related.en_US
dc.description.urihttps://pos.sissa.it/067/107/pdfen_US
dc.format.extent11 pagesen_US
dc.genreconference papers and proceedingsen_US
dc.identifierdoi:10.13016/m2emjc-yred
dc.identifier.citationKreykenbohm, Ingo. “Highly Structured Wind in Vela X-1.” In Proceedings of 7th INTEGRAL Workshop — PoS(Integral08), 67:107. SISSA Medialab, 2009. https://doi.org/10.22323/1.067.0107.en_US
dc.identifier.urihttp://hdl.handle.net/11603/21684
dc.identifier.urihttps://doi.org/10.22323/1.067.0107
dc.language.isoen_USen_US
dc.publisherProceedings of Scienceen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.titleHighly structured wind in Vela X-1en_US
dc.typeTexten_US

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