High-resolution spectrum of Cygnus X-1

Details High-resolution spectrum of Cygnus X-1 High-resolution spectrum of Cygnus X-1

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..191l&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 191-192 (SEE N85-33902 22-93)

Physics

Emission Spectra, Gamma Rays, Heao 3, High Resolution, Line Spectra, Radiation Spectra, Spectrometers, Celestial Bodies, Gamma Ray Spectra, Heao, Periodic Variations, Photons

Scientific paper

A high resolution spectrum of Cygnus X-1 in the 45 to 600 keV range is presented. The measurement was made by the HEAO 3 gamma ray spectrometer during 82 days in the fall of 1979 and spring of 1980, when the source was in its normal low state. Results of a search for narrow emission lines from the source are reported. The spectrum shows no significant narrow features. The 3 delta upper limit to a narrow 511 keV annihilation line is 3 x 0.0001 photons/sq cm/s. There is also no evidence in HEAO 3 broadband data above 500 keV for the broad annihilation feature observed by HEAO 1.

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