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.

Citation Style Language JSON

{
  "DOI": "10.1093/mnras/stx2565", 
  "abstract": "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 > 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.", 
  "author": [
    {
      "family": "Meshcheryakov", 
      "given": " Alexander V."
    }, 
    {
      "family": "Tsygankov", 
      "given": " Sergey S."
    }, 
    {
      "family": "Khamitov", 
      "given": " Irek M."
    }, 
    {
      "family": "Shakura", 
      "given": " Nikolay I."
    }, 
    {
      "family": "Bikmaev", 
      "given": " Ilfan F."
    }, 
    {
      "family": "Eselevich", 
      "given": " Maxim V."
    }, 
    {
      "family": "Vlasyuk", 
      "given": " Valeriy V."
    }, 
    {
      "family": "Pavlinsky", 
      "given": " Mikhail N."
    }
  ], 
  "container_title": "MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY", 
  "id": "89777", 
  "issue": "3", 
  "issued": {
    "date-parts": [
      [
        2018, 
        1, 
        1
      ]
    ]
  }, 
  "page": "3987-4002", 
  "title": "Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1", 
  "type": "article-journal", 
  "volume": "473"
}