4.7 Article

Probing the shot behaviour in Cygnus X-1 using simultaneous AstroSat-NICER observation

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OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac853

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accretion; accretion discs; X-rays: binaries; X-rays: general; X-rays: individual: Cyg X-1; X-rays: stars

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This study analyses the aperiodic flaring features observed in Cyg X-1, measuring the truncation of the inner accretion disc and studying the movement of the inner edge. The research discusses possible mechanisms causing these phenomena.
We analyse the aperiodic flaring features, also known as shots, observed in Cyg X-1 in the 0.1-80 keV energy band using a 6.39 ks simultaneous observation with AstroSat and Neutron star Interior Composition ExploreR (NICER). We detect 49 simultaneous shots in the soft and hard X-ray bands with NICER and AstroSat-LAXPC, respectively. We observe the shot profile for the first time in soft X-rays (0.1-3 keV), which shows a spectral peak at similar to 2 keV. Using time-averaged spectroscopy, we measured the truncation of the inner accretion disc at 6.7 +/- 0.2 gravitational radii. The shot-phase-resolved spectroscopy allowed us to identify the origin of some of the brightest aperiodic peaks in the soft X-rays. We find that the accretion rate is consistent with a constant during the shots while the inner edge of the accretion disc moves inwards/outwards as these shots rise/decay. We discuss the possible mechanisms causing the swing in the inner radius.

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