G. Cusumano, A. Segreto, V. La Parola, A. D'Aì, N. Masetti, G. Tagliaferri
The Swift-BAT survey provides an extensive and continuous monitoring of hard X-ray sources and thus it is particularly suited for the study of their long term temporal properties. We have been exploiting these data focusing on the Galactic compact high mass binaries sources, that, in this energy band, can be observed with good sensitivity even in the presence of high local soft X-ray extinction. We aim at giving new results on the temporal and spectral properties of the HMXB IGR J16283-4838 in the hard X-ray band. We performed timing analysis of the first 88-month of the BAT survey data searching for long term modulations. We also investigated the broad band (0.2-150 keV) spectral properties of IGR J16283-4838 complementing the BAT dataset with the soft X-ray data from the available Swift-XRT pointed observations. The BAT light curve of IGR J16283-4838 revealed a periodic modulation at Po=287.6\pm1.9 days (with a significance higher than 5 standard deviations). The profile of the light curve folded at Po shows a sharp peak lasting ~18$ d, over a flat plateau characterized by an intensity level ~10 times lower than the peak level. The broad band 0.2-150 keV spectrum is modeled with an absorbed power-law with a photon index Gamma 1.1 and a steepening in the BAT energy range modeled with a cut-off at an energy of ~25 keV.
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http://arxiv.org/abs/1305.4183
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