A. Segreto, V. La Parola, G. Cusumano, A. D'Aì, N. Masetti, S. Campana
The hard X-ray survey that Swift-BAT has been performing since late 2004 has provided a considerable database for a large number of sources whose hard X-ray emission was poorly known. We are exploiting the BAT survey archive to improve the temporal and spectral characterization of the Galactic hard-X-ray sources. In this letter we focus on the study of the high mass X-ray binary AX J1820.5-1434. All the data relevant to AX J1820.5-1434 have been extracted from the BAT survey archive and analyzed using a folding technique to search for periodical modulations. A broad-band spectral analysis was also performed complementing the BAT spectrum with the available Swift-XRT and XMM-Newton pointed observations. A timing analysis has revealed the detection of a coherent signal at P_0=54.03 +/- 0.07 days, that we interpret as the orbital period of the binary system. When folded with a period of P_0, the light curve shows an asymmetric profile, with a minimum roughly consistent with zero intensity. The broad band spectral analysis performed coupling Swift-XRT, XMM-Newton and Swift-BAT spectra is well modeled with an absorbed power law with a high energy exponential cutoff at ~36 keV.
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http://arxiv.org/abs/1305.3614
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