Gamma ray observations of Cygnus X-1 with OSSE.

Details Gamma ray observations of Cygnus X-1 with OSSE. Gamma ray observations of Cygnus X-1 with OSSE.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.155p&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.155-158

Physics

2

Gamma Rays: Observations, Stars: Individual: Cyg X-1, Black Hole Physics

Scientific paper

We report on ~120-days of observations of Cygnus X-1 with OSSE onboard the Compton Observatory. Emission is detected in the range 50keV to 1MeV, and we find evidence for a continuum of hard X-ray spectra over a broad range of fluxes rather than the existence of distinct flux states. Comparisons of the source spectra with various theoretical models show that an exponentially truncated power law best describes the average spectrum in the OSSE energy band. Although we have measured a new minimum in the hard X-ray flux from the source, no evidence was found for either a broad 1MeV feature or a narrow 511keV line previously reported in association with a low flux state. Upper limits on such emission features are an order of magnitude lower than earlier reported detections. The 5.6-day periodicity of the source measured at optical wavelengths was not detected with a sensitivity to the rms modulation fraction of 5% in the 60-140keV energy band.

Affiliated with

Also associated with

No associations

Rating

Gamma ray observations of Cygnus X-1 with OSSE. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Gamma ray observations of Cygnus X-1 with OSSE., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma ray observations of Cygnus X-1 with OSSE. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1146026