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26 April 2024 |
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Five Years in the Life of Cygnus X-1: BATSE Long-Term Monitoring | | W. Paciesas
; C. R. Robinson
; M. L. McCollough
; S. N. Zhang
; B. A. Harmon
; C. A. Wilson
; | | Date: |
4 Dec 1997 | | Subject: | astro-ph | | Affiliation: | 1 and 3), C. R. Robinson (2 and 3), M. L. McCollough (2 and 3), S. N. Zhang (2 and 3), B. A. Harmon , C. A. Wilson ( University of Alabama in Huntsville, Universities Space Research Association, NASA/Marshall Space Flight Center | | Abstract: | The hard X-ray emission from Cygnus X-1 has been monitored continually by BATSE since the launch of CGRO in April 1991. We present the hard X-ray intensity and spectral history of the source covering a period of more than five years. Power spectral analysis shows a significant peak at the binary orbital period. The 20-100 keV orbital light curve is roughly sinusoidal with a minimum near superior conjunction of the X-ray source and an rms modulation fraction of approximately 1.7%. No longer-term periodicities are evident in the power spectrum. We compare our results with other observations and discuss the implications for models of the source geometry. | | Source: | arXiv, astro-ph/9712072 | | Services: | Forum | Review | PDF | Favorites | |
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