X-ray spectra of accretion discs with dynamic coronae

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dc.creatorMalzac, Julien
dc.creatorBeloborodov, Andrei M.
dc.creatorPoutanen, Juri
dc.date2001-02-28
dc.date.accessioned2026-07-07T10:31:05Z
dc.date.available2026-07-07T10:31:05Z
dc.descriptionWe compute the X-ray spectra produced by non-static coronae atop accretion discs around black holes and neutron stars. The hot corona is radiatively coupled to the underlying disc (the reflector) and generates an X-ray spectrum which is sensitive to the bulk velocity of the coronal plasma, beta=v/c. We show that an outflowing corona reproduces the hard-state spectrum of Cyg X-1 and similar objects. The dynamic model predicts a correlation between the observed amplitude of reflection R and the X-ray spectrum slope Gamma since both strongly depend on beta. A similar correlation was observed and its shape is well fitted by the dynamic model. The scattering of soft radiation in an outflowing corona can also account for the observed optical-UV polarization pattern in active galactic nuclei.
dc.description12 pages; accepted to MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0102490
dc.identifierhttp://arxiv.org/abs/astro-ph/0102490
dc.identifierMon.Not.Roy.Astron.Soc.326:417,2001
dc.identifierdoi:10.1046/j.1365-8711.2001.04450.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178295
dc.subjectAstrophysics
dc.titleX-ray spectra of accretion discs with dynamic coronae
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