Journal
ASTRONOMY & ASTROPHYSICS
Volume 426, Issue 2, Pages L33-L36Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:200400077
Keywords
gamma-rays : observations; pulsars : individual PSR B1259-63
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The millisecond pulsar PSR B1259-63 and the Be star SS2883 are situated in a highly eccentric binary system, with orbital period similar to3.4 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 similar to2-6 mCrab in the 20-200 keV range, with a power law spectrum of photon index Gamma = 1.3 +/- 0.5.
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