INTEGRAL observations of the peculiar BeX System SAX J 2103 . 5 + 4545
نویسندگان
چکیده
We present an INTEGRAL data analysis of the X-ray transient SAX J2103.5+4545 during two outbursts detected in December 2002. The INTEGRAL coordinates and error circle agree with the position of the recently proposed optical counterpart. A power-law plus cutoff model provided a good fit to the 4–150 keV spectrum yielding a photon index of 1.0±0.1, a cutoff energy E cut = 7.6 ± 2.0 keV and a folding energy E fold = 30.9 ± 2.5 keV. The X-ray luminosity in the 4-150 keV energy range was found to be 6.0×10 36 erg s −1 , assuming a distance of 6.5 kpc. This luminosity, together with the derived photon index, indicate that the source is in a bright state. A 354.9±0.5 second pulse period is measured. This value is significantly smaller than previous measurements, indicating a long-term spin-up episode.
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