Cyclotron lines in the hard X-ray spectrum of Hercules X-1

Details Cyclotron lines in the hard X-ray spectrum of Hercules X-1 Cyclotron lines in the hard X-ray spectrum of Hercules X-1

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..803v&link_type=abstract

Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 803-813. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

86

Cyclotron Radiation, Stellar Spectra, X Ray Sources, Binary Stars, Line Spectra, Magnetic Flux, Neutron Stars, Spectral Line Width, Stellar Magnetic Fields

Scientific paper

Spectral features suggesting cyclotron emissions were detected during use of a phoswich detector system on a balloon flight to observe the hard X ray spectrum of the compact source Her X-1. The observations were made in the energy range 26-120 keV on Sept. 3, 1977. A line feature at 52 keV was obtained as an emission line, or at 38 keV as an absorption line. A magnetic field strength of 3-5 trillion gauss was calculated. For an emission line, the line intensity would be 0.0027 photons/sq cm per sec. The linewidth was near 21 keV FWHM, while the absorption line was smaller. Phase-dependent spectra indicated that significant variation was present in the emission line centroid of the cyclotron emission of the main pulse.

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