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• W3212658336 abstract "NGC1566 is a changing-look active galaxy that exhibited an outburst during 2017-2018 with a peak in June 2018. We triggered AstroSat observations of NGC 1566 twice in August and October 2018 during its declining phase. Using the AstroSat observations along-with two XMM-Newton observations in 2015 (pre-outburst) and June 2018 (peak-outburst), we found that the X-ray power-law, the soft X-ray excess, and the disk components showed extreme variability during the outburst. Especially, the soft excess was negligible in 2015 before the outburst, it increased to a maximum level by a factor of $>200$ in June 2018, and reduced dramatically by a factor of $sim7.4$ in August 2018 and become undetectable in October 2018. The Eddington fraction ($L/L_{Edd})$ increased from $sim0.1%$ (2015) to $sim 5%$ (June 2018), then decreased to $sim 1.5%$ (August 2018) and $0.3%$ (October 2018). Thus, NGC 1566 made a spectral transition from a high soft-excess state to a negligible soft-excess state at a few $%$ of the Eddington rate. The soft-excess is consistent with warm Comptonization in the inner disk that appears to have developed during the outburst and disappeared towards the end of the outburst over a timescale comparable to the sound crossing time. The multi-wavelength spectral evolution of NGC 1566 during the outburst is most likely caused by the radiation pressure instability in the inner regions of the accretion disk in NGC 1566." @default.
• W3212658336 created "2021-11-22" @default.
• W3212658336 creator A5048150735 @default.
• W3212658336 creator A5090694497 @default.
• W3212658336 date "2022-01-01" @default.
• W3212658336 modified "2023-10-14" @default.
• W3212658336 title "AstroSat View of Spectral Transition in the Changing-look Active Galaxy NGC 1566 during the Declining Phase of the 2018 Outburst" @default.
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• W3212658336 doi "https://doi.org/10.3847/1538-4357/ac3a6e" @default.
• W3212658336 hasPublicationYear "2022" @default.
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