Hard X-ray spectra of some X-ray binaries from balloon-borne observations

Details Hard X-ray spectra of some X-ray binaries from balloon-borne observations Hard X-ray spectra of some X-ray binaries from balloon-borne observations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993basi...21..555c&link_type=abstract

Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 21, no. 3-4, p. 555-559

Astronomy and Astrophysics

Astronomy

2

Balloon-Borne Instruments, Cyclotron Radiation, Energy Spectra, X Ray Astronomy, X Ray Binaries, X Ray Spectra, Data Correlation, Data Reduction, Light Curve, Spectrum Analysis

Scientific paper

We have studied X-ray binaries 4U1907 + 09, GX1 + 4 and Cygnus X-1 in the energy range 20-100 keV, using balloon-borne xenon-filled multilayer proportional counters flown from Hyderabad, India. Results of these observations are reported in this paper. X-ray binary 4U1907 + 09 was observed in 1985 and 1991. During 1985 the source was detected above 20 keV at a significance level of 13 sigma and was only marginally detected in 1991, indicating that the flux was four times lower than that on the first occasion. Energy spectrum between 20-100 keV obtained in 1985 was fitted with power-law with photon index -1.4. GX1 + 4 was observed in December 1991 and April 1992. The source showed a factor of two decrease in flux during the two observations. Hard X-rays spectra obtained on two occasions are found to be consistent with spectrum obtained from High Energy X-Ray Experiment (HEXE) experiment on board Kvant module. Cygnus X-1 was observed on several occasions from 1984 to 1992. There is an indication of Quasi-Periodic Oscillation (QPO) in April 1992 Cygnus X-1 observations as seen by SIGMA on board GRANAT and BATSE on board GRO.

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