KFU. Card publication. Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1

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FEDERAL UNIVERSITY

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EVOLUTION OF BROAD-BAND SED DURING OUTBURST RISE IN NS X-RAY NOVA AQL X-1

Form of presentation

Articles in international journals and collections

Year of publication

2018

Язык

английский

Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Bibliographic description in the original language

Meshcheryakov Alexander V., Tsygankov Sergey S., Khamitov Irek M., Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1//MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - 2018. - Vol.473, Is.3. - P.3987-4002.

Annotation

he 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.

Keywords

тесные двойные системы, аккреционные диски, нейтронные звезды

The name of the journal

Monthly Notices of the Royal Astronomical Society

URL

https://academic.oup.com/mnras/article-abstract/473/3/3987/4331644?redirectedFrom=PDF

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=176945&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.date.accessioned	2018-01-01T00:00:00Z	ru_RU
dc.date.available	2018-01-01T00:00:00Z	ru_RU
dc.date.issued	2018	ru_RU
dc.identifier.citation	Meshcheryakov Alexander V., Tsygankov Sergey S., Khamitov Irek M., Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1//MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - 2018. - Vol.473, Is.3. - P.3987-4002.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=176945&p_lang=2	ru_RU
dc.description.abstract	Monthly Notices of the Royal Astronomical Society	ru_RU
dc.description.abstract	he 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.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	тесные двойные системы	ru_RU
dc.subject	аккреционные диски	ru_RU
dc.subject	нейтронные звезды	ru_RU
dc.title	Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1	ru_RU
dc.type	Articles in international journals and collections	ru_RU