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Preprint 07a/05

Observation of V0332+53 over the 2004/2005 outburst with Integral

Kreykenbohm, I. (1,2), Mowlavi, N. (2), Pottschmidt, K. (3), Wilms, J. (4), Shaw, S.E. (5,2), Rothschild, R.E. (3), Produit, N. (2), Coburn, W. (6), Kretschmar, P. (7), Santangelo, A. (1), Staubert, R. (1)

(1) Institut für Astronomie und Astrophysik, University of Tübingen,Germany;
(2) INTEGRAL Science Data Centre, Versoix, Switzerland;
(3) University of California, San Diego, Center for Astrophysics and Space Sciences,La Jolla, USA
(4) University of Warwick, UK
(5) School of Physics and Astronomy, University of Southampton,UK
(6) University of California, Berkeley, SSL, USA
(7) ESAC, Madrid, Spain

To be published in: Proceedings of "The X-ray Universe 2005", San Lorenzo de El Escorial (Spain), 26-30 September 2005

Abstract. We present the spectral and temporal analysis of the 2004/2005 outburst of the transient X-ray pulsar V0332+53 as observed with Integral. After the discovery of the third cyclotron line in phase averaged spectra (Kreykenbohm et al 2005, Pottschmidt et al 2005), detailed pulse phase spectroscopy revealed remarkably little variability of the cyclotron lines through the 4.4s X-ray pulse (Pottschmidt et al 2005). During the decline of the outburst, the flux was observed to decay exponentially until 2005 Feb 10 and linearly thereafter. The spectrum was found to become harder with time, while the folding energy remained constant. The energy of the fundamental cyclotron line increased with time from 26.5kev in the RXTE observation up to 29.5kev in the last Integral one indicating that the emission region is moving closer to the surface of the neutron star. For a detailed analysis, see Mowlavi et al (2005).
 

Preprint (94 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0511270

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