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- W2233063984 abstract "Aims : We study the `spectro-temporal' characteristics of the source GS 2023+338 (V404 Cyg) during the initial phase of its June 2015 outburst, over the energy range of 0.5 - 150 keV. This is the first detailed study of the characteristics of this source based on SWIFT observations, being reported. We study the nature of soft as well as the hard emission of the energy spectra, and the temporal evolution of the source. We attempt to understand these characteristics with respect to the previous outburst of this source, and other Galactic black hole sources. Conclusions : This source is observed to exhibit spectral state transitions occupying the hard, intermediate and soft spectral states. The hardness intensity diagram do not show a `q-shape' which is usually observed in black hole transients. Dramatic changes in the `spectro-temporal' properties are also exhibited before the ejection of a radio jet suggesting it to be associated with coronal ejection. It seems that the ejected matter is obscuring the Keplerian disk or may be evacuation of the inner part of the Keplerian disk for a short duration, due to which the disk is not observed after a radio flare. The absorption features observed suggest the presence of wind emission and the evolution of the characteristics of the variable Fe line emission during both the hard and intermediate states, indicates its origin to be probably related to the wind/outflow." @default.
- W2233063984 created "2016-06-24" @default.
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- W2233063984 date "2016-01-13" @default.
- W2233063984 modified "2023-09-27" @default.
- W2233063984 title "SWIFT view of the 2015 outburst of GS 2023+338 (V404 Cyg): complex `spectro-temporal' evolution" @default.
- W2233063984 hasPublicationYear "2016" @default.
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