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RXTE Discovery of Multiple Cyclotron Lines during the 2004 December Outburst of V0332+53

K. Pottschmidt·I. Kreykenbohm·J. Wilms·W. Coburn·R. E. Rothschild·P. Kretschmar·V. McBride·S. Suchy·R. Staubert
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Abstract

We present an analysis of the 2-150 keV spectrum of the transient X-ray pulsar V0332+53 taken with the Rossi X-Ray Timing Explorer (RXTE) in 2004 December. We report on the detection of three cyclotron resonance features at 27, 51, and 74 keV in the phase-averaged data, corresponding to a polar magnetic field of 2.7 x 10^12 G. After 4U0115+63, this makes V0332+53 the second accreting neutron star in which more than two cyclotron lines have been detected; this has now also been confirmed by INTEGRAL. Pulse-phase spectroscopy reveals remarkably little variability of the cyclotron line through the 4.4 s X-ray pulse.

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K. Pottschmidt, I. Kreykenbohm, J. Wilms, W. Coburn, R. E. Rothschild, P. Kretschmar, V. McBride, S. Suchy, R. Staubert. 2005-11-09. RXTE Discovery of Multiple Cyclotron Lines during the 2004 December Outburst of V0332+53. https://doi.org/10.1086/498689

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