'Superlow-state' hard X-ray observation of Cygnus X-1

Details 'Superlow-state' hard X-ray observation of Cygnus X-1 'Superlow-state' hard X-ray observation of Cygnus X-1

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..544u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 544-548. Research supported by CNR.

Astronomy and Astrophysics

Astronomy

14

Black Holes (Astronomy), Cygnus Constellation, Stellar Spectra, X Ray Binaries, X Ray Spectra, Gamma Rays, X Ray Astronomy, X Ray Telescopes

Scientific paper

Hard-X-ray observations of Cyg X-1, obtained using the multiwire proportional counters and scintillator arrays of the Milan-Frascati-Southampton balloon-borne instrument package during July 1987, are reported. The results are combined with previous observational data and presented in tables and graphs. A very low flux similar to that measured by the HEAO-3 gamma-ray spectrometer in 1979 and in agreement with low-energy observations by the Ginga satellite during August 1987 is detected, confirming that the object is in a 'superlow' state. The photon spectrum is found to be well fit by a Comptonized model with electron temperature 56 keV and optical depth 2.3, or by a simple power law with photon index alpha = 1.92 and intensity 1.10 crab.

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