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• W2095368710 abstract "Mrk 766, a bright narrow-line Seyfert 1, has been observed eight times by the XMM-Newton satellite. We carried out the analysis of the composite data from all of these observations together by applying a dynamical method. Through this analysis, we noted a longer timescale variability in addition to rapid short-time variability. This longer term variability is manifested by the presence of two distinct branches in flux-flux plots. Moreover, the data show the presence of absorbing material whose average thickness decreases gradually from ~2 × 1023 cm–2 during the dim state to ~1022 cm–2 as the source brightens to brighter states. To explain this longer timescale behavior and others already found self-consistently, we offer a promising model. In this model, the source is dim when a small emission region is covered by a small, denser portion of a partial-covering cloud; the source brightens as it becomes larger and covered predominantly by a less dense, larger region of the covering cloud. The short rapid variability, in contrast, is consistent with the highly variable power-law component from the coronal primary emission region, which is superimposed onto a less variable, ionized relativistic reflection component. Last, a possible presence of some unique soft flares is suggested. Unlike many other flares seen in the light curves, these flares occur only in the 0.3-2.0 keV soft band. These soft flares may be attributed to hot spots on the accretion disk." @default.
• W2095368710 created "2016-06-24" @default.
• W2095368710 creator A5003592007 @default.
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• W2095368710 date "2013-12-11" @default.
• W2095368710 modified "2023-10-12" @default.
• W2095368710 title "DYNAMICAL BEHAVIOR OF X-RAY SPECTRA FROM MARKARIAN 766" @default.
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• W2095368710 doi "https://doi.org/10.1088/0004-637x/780/1/35" @default.
• W2095368710 hasPublicationYear "2013" @default.
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