BeppoSAX Observation of LMC X-4: Evidence for a High Energy Cyclotron Line

Details BeppoSAX Observation of LMC X-4: Evidence for a High Energy Cyclotron Line BeppoSAX Observation of LMC X-4: Evidence for a High Energy Cyclotron Line

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2206l&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #22.06; Bulletin of the American Astronomical Society, Vol. 32, p.1214

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the spectral analysis of the X-ray pulsar LMC X--4 in its high state observed by BeppoSAX. During this observation no coherent pulsations are detected. The spectrum of LMC--4 is complex. The primary continuum is well described by a power law with a high energy cutoff (E cutoff ~ E fold ~ 18 keV). The addition of a cyclotron absorption line at ~ 100 keV improves the fit significantly. The inferred magnetic moment is ~ 1.1 x 1031 Gauss cm3, in agreement whit the value estimated assuming that the neutron star is at the spin equilibrium, as has been proposed for this source. The remaining excess at low energies can be fitted by a Comptonization of soft photons by moderately hot electrons (kT ~ 0.9), with an optical depth τ ~ 16. The seed photons for this Comptonization are consistent with black body emission from the accretion disk at the magnetospheric radius.

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