First results of observations of transient pulsar SAXJ2103.5+4545 with the INTEGRAL observatory

Abstract

We present preliminary results of observations of X-ray pulsar SAX J2103.5+4545 with INTEGRAL observatory in Dec 2002. Maps of this sky region in energy bands 3-10, 15-40, 40-100 and 100-200 keV are presented. The source is significantly detected up to energies of $\sim 100$ keV. The hard X-ray flux in the 15-100 energy band is variable, that could be connected with the orbital phase of the binary system. We roughly reconstructed the source spectrum using its comparison to that of Crab nebula. It is shown that the parameters of the source spectrum in 18-150 keV energy range are compatible with that obtained earlier by RXTE observatory

5 pages, 4 figures, accepted for publication in the Astronomy Letters

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• Discovery of Soft Spectral Component and Transient 22.7s Quasi Periodic Oscillations of SAX J2103.5+4545
• First results from TOO observations of the Aql X-1 field with INTEGRAL
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• Recent activity of the Be/X-ray binary system SAX J2103.5+4545
• Broadband Observations of the Transient X-ray Pulsar SAX J2103.5+4545
• A possible phase dependent absorption feature in the transient X-ray pulsar SAX J2103.5+4545