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Preprint A/06

3A 0535+262 in outburst

P. Kretschmar (1), K. Pottschmidt (2), C. Ferrigno (3), I. Kreykenbohm (4,5), A. Domingo (6), J. Wilms (7), R. Rothschild (2), W. Coburn (8), E. Kendziorra (4), R. Staubert (4), G. Schönherr (4), A. Santangelo (4), A. Segreto (3)

(1) ESA - European Space Agency Center, 28080 Madrid, Spain
(2) Center for Astrophysics and Space Sciences, UCSD, La Jolla, CA, USA
(3) Istituto di Astrofisica Spaziale (IASF-INAF), Palermo, Italy
(4) Institut für Astronomie und Astrophysik - Astronomie, 72076 Tübingen, Germany
(5) INTEGRAL Science Data Centre, 1290 Versoix, Switzerland
(6) Laboratorio de Astrofisica Espacial y Fisica Fundamental, LAEFF-INTA, 28080 Madrid, Spain
(7) Department of Physics, University of Warwick, CV4 7AL Warwick, UK
(8) Space Sciences Laboratory, University of California, CA 94720-7450 Berkeley, USA

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

Abstract. The Be/X-ray binary 3A 0535+262 has the highest magnetic field determined by cyclotron line studies of all accreting X-ray pulsars, despite an open debate if the fundamental line was rather at ~50 or above 100 keV as observed by different instruments in past outbursts. The source went into quiescence for more than ten years since its last outbursts in 1994. Observing during a `normal' outburst August/September 2005 with Integral and RXTE we find a strong cyclotron line feature at ~45 keV and have for the first time since 1975 determined the low energy pulse profile.

Preprint (198 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0511601

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