INTEGRAL observation of V 0332+53 in outburst
Santangelo, A.; Walter, R.; Mowlavi, N.; Produit, N.; Staubert, R.; Türler, M.; Soldi, S.; Kreykenbohm, I.; Rothschild, R. E.; Lubiński, P.; Dubath, P.; Coburn, W.
Germany, Switzerland, Poland, United States
Abstract
We present the analysis of a 100 ks INTEGRAL (3-100 keV) observation of the transient X-ray pulsar V 0332+53in outburst. The source is pulsating at PPulse=4.3751±0.0002 s with a clear double pulse from 6 keVto 60 keV. The average flux was ~550 mCrab between 20 keVand 60 keV. We modeled the broad band continuum from 5 keVto 100 keVwith 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 keVas 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 RXTEdata.