Multiple Cyclotron Lines in the Spectrum of 4U 0115+63

Details Multiple Cyclotron Lines in the Spectrum of 4U 0115+63 Multiple Cyclotron Lines in the Spectrum of 4U 0115+63

2000-04-20

arxiv.org/abs/astro-ph/0004297v1

Astronomy and Astrophysics

Astrophysics

5 pages. To appear in "Proceedings of the 5th Compton Symposium"

Scientific paper

10.1063/1.1303197

We report phase resolved spectroscopy of the transient accreting pulsar, 4U0115+63. For the first time, more than two cylotron resonance scattering features are detected in the spectrum of an X-ray pulsar. The shape of the fundamental line appears to be complex, and this is in agreement with predictions of Monte-Carlo models. As in other pulsars, the line energies and optical depths are strong functions of pulse phase. One possible model for this is an offset of the dipole of the neutron star magnetic field.

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