A BeppoSAX observation of XTE J0055-724 = 1SAX J0054.9-7226, a new X-ray pulsar in the SMC

Astronomy and Astrophysics – Astrophysics

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X-Rays: Binaries, Individual (1Sax J0054.9-7226), X-Rays: Pulsars, Galaxies: Magellanic Clouds

Scientific paper

We report on the result of a BeppoSAX Target of Opportunity Observation of the hard pulsating X-ray source XTE J0055-724 = 1SAX J0054.9-7226, in the Small Magellanic Cloud (SMC). The source was detected by BeppoSAX at a flux level of ~ 2 * 10(-11) erg cm(-2) s(-1) (2-10 keV) and its position is consistent with that of the ROSAT PSPC source 1WGA J0054.9-7226 and the Einstein source 2E 0053.2-7242. Both these sources were known to possess a marked variability, on timescales ranging from months to years. The BeppoSAX energy spectrum of 1SAX J0054.0-7226 is hard and well modelled by an absorbed hard power-law model with a photon index ~ 0.81. BeppoSAX detected up to 40 keV the ~ 59 s pulsations originally discovered with by RXTE (Marshall & Lochner 1998a; Santangelo et al. 1998).

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