X-ray Shots of Cyg X-1

Abstract

X-ray shots of Cyg X-1 in different energy bands and spectral states have been studied with PCA/RXTE observations. The detailed shot structure is obtained by superposing many shots with one millisecond time bin through aligning their peaks with an improved algorithm. In general, the shots are composed of a slow rise and fast decay. The shot structures in the different states are different. The duration of shot in the high state is shorter than that in the low and transition states. The shot profile in the high energy band is more asymmetric and narrower than that in the low energy band. The average hardness of shot is lower than that of steady emission in the transition and low states but higher than that in the high state. The time lags between the shots in higher and lower energy bands have been found in the different states. In transition states, the time lag is the largest among the different states of Cyg X-1, and it is the smallest in the low state. The implications of the observed shot features for shot models are discussed.

Latex, 20 pages, 12 figures(included), to be published in ApJ

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Cited by in corpus (18)

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• Discovery of powerful millisecond flares from Cygnus X-1
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• Understanding Spectral Variability and Time Lags in Accreting Black Holes
• Temporal and Spectral Correlations of Cyg X-1
• X-ray time lags from a pivoting power law in black holes
• New method for black-hole spin measurement based on flux variation from an infalling gas ring
• X-Ray Spectral Variability in Cygnus X-1
• Probing the Inflow/Out-flow and Accretion Disk of Cyg X-1 in the High State with HETG/Chandra
• Hard X-ray/Soft gamma-ray experiments and missions: overview and prospects
• Power Spectra of X-ray Binaries
• Probing the shot behaviour in Cygnus X-1 using simultaneous AstroSat-NICER observation
• Diagnostics of Neutron Star and Black Hole X-Ray Binaries with X-Ray Shot Widths
• Time Domain Studies of X-ray Shot Noise in Cygnus X-1
• X-Ray Spectral Variability in Initial Rise of XTE J1550-564
• X-Ray Variability Coherence in the Time Domain
• A new algorithm for detecting X-ray shots in Cyg X-1