An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63

Details An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63 An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..240w&link_type=abstract

Nature, vol. 282, Nov. 15, 1979, p. 240-243.

Physics

133

Absorption Spectra, Pulsars, Stellar Radiation, Stellar Spectra, X Ray Sources, Cyclotron Resonance, Energy Spectra, Heao 1, Neutron Stars, Radiant Flux Density, Spectral Line Width

Scientific paper

A spectral feature, apparently an absorption line, has been observed at an energy of 20.1 + or - 0.5 keV in the pulsed flux of the 3.61-s X-ray pulsar 4U 0115+63 by using the UCSD/MIT instrument on HEAO 1. The line strength, expressed as equivalent width, is 3.1 + or - 0.5 keV. Although essentially unresolved, the feature has a depth more than 60% of the continuum flux. If the feature arises by cyclotron resonance absorption near the magnetic poles of the neutron star, it implies a magnetic field of between approximately 1.8 and 2.5 x 10 to the 12th G, depending on the gravitational redshift (no more than about 5-40%).

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