1 Ocak 2018 Dergi makalesi Açık Erişim

Meshcheryakov, Alexander V.; Tsygankov, Sergey S.; Khamitov, Irek M.; Shakura, Nikolay I.; Bikmaev, Ilfan F.; Eselevich, Maxim V.; Vlasyuk, Valeriy V.; Pavlinsky, Mikhail N.

Dublin Core

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  <dc:creator>Meshcheryakov, Alexander V.</dc:creator>
  <dc:creator>Tsygankov, Sergey S.</dc:creator>
  <dc:creator>Khamitov, Irek M.</dc:creator>
  <dc:creator>Shakura, Nikolay I.</dc:creator>
  <dc:creator>Bikmaev, Ilfan F.</dc:creator>
  <dc:creator>Eselevich, Maxim V.</dc:creator>
  <dc:creator>Vlasyuk, Valeriy V.</dc:creator>
  <dc:creator>Pavlinsky, Mikhail N.</dc:creator>
  <dc:date>2018-01-01</dc:date>
  <dc:description>The observed evolution of the broad-band spectral energy distribution (SED) in NS X-ray Nova Aql X-1 during the rise phase of a bright Fast-Rise-Exponential-Decay-type outburst in 2013 can be understood in the framework of thermal emission from non-stationary accretion disc with radial temperature distribution transforming from a single-temperature blackbody emitting ring into the multicolour irradiated accretion disc. SED evolution during the hard to soft X-ray state transition looks unusual, as it cannot be reproduced by the standard disc irradiation model with a single irradiation parameter for NUV, Optical and NIR spectral bands. NIR (NUV) band is correlated with soft (hard) X-ray flux changes during the state transition interval, respectively. In our interpretation, at the moment of X-ray state transition UV-emitting parts of the accretion disc are screened from direct X-ray illumination from the central source and are heated primarily by hard X-rays (E &gt; 10 keV), scattered in the hot corona or wind possibly formed above the optically thick outer accretion flow; the outer edge of multicolour disc, which emits in Optical-NIR, can be heated primarily by direct X-ray illumination. We point out that future simultaneous multiwavelength observations of X-ray Nova systems during the fast X-ray state transition interval are of great importance, as it can serve as 'X-ray tomograph' to study physical conditions in outer regions of accretion flow. This can provide an effective tool to directly test the energy-dependent X-ray heating efficiency, vertical structure and accretion flow geometry in transient low-mass X-ray binaries.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/89777</dc:identifier>
  <dc:identifier>oai:zenodo.org:89777</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473(3) 3987-4002</dc:source>
  <dc:title>Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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