تقرير
Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1
| العنوان: | Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1 |
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| المؤلفون: | Meshcheryakov, Alexander V., Tsygankov, Sergey S., Khamitov, Irek M., Shakura, Nikolay I., Bikmaev, Ilfan F., Eselevich, Maxim V., Vlasyuk, Valeriy V. |
| سنة النشر: | 2017 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | 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 FRED-type outburst in 2013 can be understood in the framework of thermal emission from unstationary accretion disc with temperature radial distribution transforming from a single-temperature blackbody emitting ring into the multi-colour irradiated accretion disc. SED evolution during the hard to soft X-ray state transition looks curious, as it can not be repro- duced 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 interpreta- tion, 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 primary 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 multi-colour disc, which emits in Optical-NIR, can be heated primary by direct X-ray illumination. We point out that future simultaneous multi-wavelength 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 LMXBs. Comment: Submitted to MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stx2565 |
| URL الوصول: | http://arxiv.org/abs/1703.09159 |
| رقم الأكسشن: | edsarx.1703.09159 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stx2565 |
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