The study of the long-term spectral variability of Cyg X-1 with rossi X-ray timing explorer

Details The study of the long-term spectral variability of Cyg X-1 with rossi X-ray timing explorer The study of the long-term spectral variability of Cyg X-1 with rossi X-ray timing explorer

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50....1d&link_type=abstract

Acta Astronomica Sinica, vol. 50, no. 1, p. 1-14

Physics

2

Physical Data And Processes: Black Hole Physics, X-Ray: Binary, X-Ray: Individuals

Scientific paper

We present a comprehensive analysis of extensively studied black hole X-ray binary Cyg X-1 with the observation of Rossi X-ray Timing Explorer all-sky monitor (ASM,1.5---12KeV) from January 1996 to May 2005 and analyze the correlation of Photon Counts rate and hardness ratio HR2(5---12KeV/3---5KeV). At first, we analyze the ASM data on one-day time scale and find: (1) When Cyg X-1 is in soft state, the correlation of Photon Counts rate to HR2 is negative in A-band(1.5--3KeV) and are positive in B-band(3---5KeV) and C-band(5---12KeV). (2)The correlation of Photon Counts rate to HR2 are all negative in A-band(1.5---3KeV), B-band(3---5KeV) and C-band(5---12KeV) in hard state. (3) The correlation of hardness ratio of HR2 to HR1 on one-day time scale are both positive in soft state and hard state. At the same time, we also analysis the spectral variability using the ASM data on ``Dwell by Dwell'' time scale, and find a 'new' and interesting correlation, that is: (1) The correlation of Photon Counts rate to hardness ratio HR2 are both negative in A-band and B-band, but is positive in C-band during MJD=52600-52760. (2) The correlation of HR2 to HR1 is negative when Cyg X-1 is in hard state.

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