Abstract
We present the analysis of a 100 ks INTEGRAL (3-100 keV) observation of the transient X-ray pulsar V0332+53 in outburst. The source is pulsating at P Pulse = 4.3751 ± 0.0002 s with a clear double pulse from 6 keV to 60 keV. The average flux was ∼550 mCrab between 20 keV and 60 keV. We modeled the broad band continuum from 5 keV to 100 keV with a power-law modified by an exponential cut off. We observe three cyclotron lines: the fundamental line at 24.9 -0.1 +0.1 keV, the first harmonic at 50.5 +0.1 -0.1 keV as well as the second harmonic at 71.7 -0.7 +0.8 keV, thus confirming the discovery of the harmonic lines by Coburn et al. (2005) in RXTE data.
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