Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975cuny.rept.....w&link_type=abstract
Final Report, 1 Nov. 1973 - 31 Mar. 1975 Columbia Univ., New York, NY. Astrophysics Lab.
Astronomy and Astrophysics
Astronomy
Cygnus Constellation, Galaxies, X Ray Sources, Black Holes (Astronomy), Computer Systems Programs, Uhuru Satellite
Scientific paper
Computer software necessary for the analysis of the time variability of X-ray sources was developed and tested. Seventy-one Uhuru observations of the black hole candidate Cygnus X-1 were also examined. Data show that the X-ray emission can be best represented as arising from randomly occurring X-ray flares with a mean rate of occurrence of 18 flares/sec and a mean cooling time of approximately 1/2 sec. Furthermore data show that photons in the 2 to 16 keV bandwidth arise from within the same flares. Finally, it was found that the mean flare rate and cooling time have been constant since the source underwent a spectral transition in March 1971. Long term variations of several parameters associated with the X-ray emission from this object were studied.
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