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Title: Discovery of a bright X-ray transient in the Galactic Center with XMM-Newton
Authors: Porquet, D.
Burwitz, V.
Aschenbach, B.
Predehl, P.
Grosso, N.
Andronov, I. L.
Warwick, R. S.
First Published: Jan-2005
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2005, 430 (1)
Abstract: We report the discovery of a bright X-ray transient object, XMMU J174554.4-285456 , observed in outburst with XMM-Newton on October 3, 2002, and located at 6.3 $^{\prime}$ from Sgr A* , the supermassive black hole at the Galactic center. This object exhibits a very large X-ray luminosity variability of a factor of about 1300 between two X-ray observations separated by four months. The X-ray spectrum is best fitted by a power-law with a photon index of $1.6\pm0.2$ and absorption column density of $14.1^{+1.6}_{-1.4}\times10^{22}$ cm -2. This large absorption suggests this source is located at the distance of the Galactic center, i.e., 8 kpc. The 2-10 keV luminosity is about $1.0 \times 10^{35}\,(d/{\rm 8\,kpc})^{2}$ erg s -1. A pulsation period of about 172 s is hinted by the timing analysis. The X-ray properties strongly suggest a binary system with either a black hole or a neutron star for the compact object.
DOI Link: 10.1051/0004-6361:200400117
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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