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Looking for black-holes in X-ray binaries with XMM-Newton: XTE J1817-330 and XTE J1856+053

By Gloria Sala, Jochen Greiner and Natalia Primak


Abstract. The X-ray binary XTE J1817-330 was discovered in outburst on 26 January 2006 with RXTE/ASM. One year later, another X-ray transient discovered in 1996, XTE J1856+053, was detected by RXTE during a new outburst on 28 February 2007. We triggered XMM-Newton target of opportunity observations on these two objects to constrain their parameters and search for a stellar black holes. We summarize the properties of these two X-ray transients and show that the soft X-ray spectra indicate indeed the presence of an accreting stellar black hole in each of the two systems

Topics: Black holes, X-ray binaries – X-rays, individual, XTE J1817-330, XTE J1856+053 PACS, 97.60.Lf, 97.80.Jp
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