We report the detection of a cyclotron absorption line and its second harmonic in the average spectrum of the high mass X-ray binary 4U1907+09 observed by the BeppoSAX satellite. The broad band spectral capability of BeppoSAX allowed a good determination of the continuum against which the two absorption features are evident at similar to 19 and similar to 39 keV. Correcting for the gravitational redshift of a similar to 1.4 M-circle dot neutron star, the inferred surface magnetic field strength is B-surf = 2.1 x 10(12) G. (C) 2000 COSPAR. Published by Elsevier Science Ltd.
BeppoSAX observation of 4U 1907+09: Detection of a cyclotron line and its second harmonic.
BURDERI, LUCIANO;
2000-01-01
Abstract
We report the detection of a cyclotron absorption line and its second harmonic in the average spectrum of the high mass X-ray binary 4U1907+09 observed by the BeppoSAX satellite. The broad band spectral capability of BeppoSAX allowed a good determination of the continuum against which the two absorption features are evident at similar to 19 and similar to 39 keV. Correcting for the gravitational redshift of a similar to 1.4 M-circle dot neutron star, the inferred surface magnetic field strength is B-surf = 2.1 x 10(12) G. (C) 2000 COSPAR. Published by Elsevier Science Ltd.
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