New observations of the cyclotron absorption feature in Hercules X-1

Details New observations of the cyclotron absorption feature in Hercules X-1 New observations of the cyclotron absorption feature in Hercules X-1

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.346..250m&link_type=abstract

Nature (ISSN 0028-0836), vol. 346, July 19, 1990, p. 250-252. Research supported by NASA.

Physics

95

Electron Cyclotron Heating, Neutron Stars, Pulsars, Stellar Magnetic Fields, X Ray Binaries, Magnetic Field Configurations, X Ray Spectra

Scientific paper

The Ginga satellite observatory has been used to measure a cyclotron feature in the hard X-ray spectrum of the 1.24-s binary pulsar Hercules X-1 with a much greater energy resolution than in previous observations. The spectrum from 10-60 keV can be described with a simple analytical formula which indicates an absorption feature at about 34 keV rather than an emission feature at about 50 keV. From this, the surface magnetic field strength of Her X-1 is estimated to be (2.9 + or - 0.3) x 10 to the 12th G.

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