dc.contributor.author | Tsygankov SS | |
dc.contributor.author | Vlasyuk VV | |
dc.contributor.author | Khamitov IM | |
dc.contributor.author | Bikmaev IF | |
dc.contributor.author | Shakura NI | |
dc.contributor.author | Meshcheryakov AV | |
dc.contributor.author | Pavlinsky MN | |
dc.contributor.author | Eselevich MV | |
dc.date.accessioned | 2022-10-27T11:49:05Z | |
dc.date.available | 2022-10-27T11:49:05Z | |
dc.identifier.uri | https://www.utupub.fi/handle/10024/155152 | |
dc.description.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. | |
dc.language.iso | en | |
dc.publisher | OXFORD UNIV PRESS | |
dc.title | Evolution of broad-band SED during outburst rise in NS X-ray Nova Aql X-1 | |
dc.identifier.url | https://academic.oup.com/mnras/article/473/3/3987/4331644# | |
dc.identifier.urn | URN:NBN:fi-fe2021042718905 | |
dc.relation.volume | 473 | |
dc.contributor.organization | fi=Tuorlan observatorio|en=Tuorla Observatory| | |
dc.contributor.organization-code | 2606705 | |
dc.converis.publication-id | 30311303 | |
dc.converis.url | https://research.utu.fi/converis/portal/Publication/30311303 | |
dc.format.pagerange | 4002 | |
dc.format.pagerange | 3987 | |
dc.identifier.eissn | 1365-2966 | |
dc.identifier.jour-issn | 0035-8711 | |
dc.okm.affiliatedauthor | Tsygankov, Sergey | |
dc.okm.discipline | 115 Astronomy and space science | en_GB |
dc.okm.discipline | 115 Avaruustieteet ja tähtitiede | fi_FI |
dc.okm.internationalcopublication | international co-publication | |
dc.okm.internationality | International publication | |
dc.okm.type | Journal article | |
dc.publisher.country | United Kingdom | en_GB |
dc.publisher.country | Britannia | fi_FI |
dc.publisher.country-code | GB | |
dc.publisher.place | Oxford | |
dc.relation.doi | 10.1093/mnras/stx2565 | |
dc.relation.ispartofjournal | Monthly Notices of the Royal Astronomical Society | |
dc.relation.issue | 3 | |
dc.year.issued | 2018 | |