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Issue A&A
Volume 426, Number 2, November I 2004
Page(s) L33 - L36
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200400077



A&A 426, L33-L36 (2004)
DOI: 10.1051/0004-6361:200400077

Letter

INTEGRAL observations of the PSR B1259-63/SS2883 system after the 2004 periastron passage

S. E. Shaw1, 2, M. Chernyakova2, 3, J. Rodriguez4, 2, R. Walter2, 3, P. Kretschmar5, 2 and S. Mereghetti6

1  School of Physics and Astronomy, University of Southampton, SO17 1BJ, UK
    e-mail: simon.shaw@obs.unige.ch
2  INTEGRAL Science Data Centre, 1290 Versoix, Switzerland
3  Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
4  CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), 91191 Gif-Sur-Yvette Cedex, France
5  Max-Planck-Institut für Extraterrestrische Physik, 87548 Garching, Germany
6  Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Milano, via Bassini 15, 20133 Milano, Italy

(Received 6 July 2004 / Accepted 10 September 2004)

Abstract
The millisecond pulsar PSR B1259-63 and the Be star SS2883 are situated in a highly eccentric binary system, with orbital period ~3.4 years. We report on hard X-ray observations obtained with the INTEGRAL satellite close to the 2004 periastron passage. These are the first imaging observations of this system in the hard X-ray range ( >20 keV) and allow the emission of PSR B1259-63 to be separated from that of a nearby unidentified variable source which may have contaminated previous hard X-ray observations of this system. Using the IBIS/ISGRI instrument we measured a flux of ~2-6 mCrab in the 20-200 keV range, with a power law spectrum of photon index $\Gamma = 1.3 \pm 0.5$.


Key words: gamma-rays: observations -- pulsars: individual PSR B1259-63

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© ESO 2004


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