Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978cosp.meet.....n&link_type=abstract
COSPAR, Plenary Meeting, 21st, Innsbruck, Austria, May 29-June 10, 1978, Paper. 14 p.
Physics
Variable Stars, X Ray Sources, Balloon-Borne Instruments, Fourier Transformation, Time Series Analysis
Scientific paper
The Fourier analysis method is applied to hard X-ray data obtained from Cyg X-1 with balloon-borne detectors. Power spectrum densities are determined for the OFF and ON states, and it is found that the power spectrum density exhibits a significant (99.7%) peak at about 0.052 Hz for the ON state but not for the OFF state. The results suggest that 24% of the hard X-ray intensity of Cyg X-1 is variable with a period of 19.2 sec.
Nakagawa Masayuki
Sakurai Haruo
Uchida M. M. M.
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