Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..311s&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
6
Balloon-Borne Instruments, Extraterrestrial Radiation, Galactic Radiation, X Ray Sources, X Ray Spectroscopy, Binary Stars, Elliptical Galaxies, Emission Spectra, Energy Spectra, Line Spectra, Pulsars, Radiant Flux Density, Radio Sources (Astronomy), Scintillation Counters, X Ray Spectra
Scientific paper
The high energy photon spectrum of Hercules X-1 and evidence for the cyclotron line feature are presented. A review of all measurements indicates that the intrinsic width of the spectral feature is about 21 keV FWHM for an emission line, and about 11 keV FWHM for an absorption line. Results on Centaurus A and several other galactic binary X-ray sources including Cygnus X-1 and X-3, GX 1+4, and 4U 1700-37 are also presented. The same spectral image is found on Centaurus A as HEAO-A2/A4, although with an intensity lower by a factor of about two, which indicates that the hard X-ray luminosity is variable on a time scale of a few months.
Kendziorra Eckhard
Pietsch Wolfgang
Proctor R. J.
Reppin Claus
Staubert Rüdiger
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