Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/26730
 Title: XMM-Newton observation of the brightest X-ray flare detected so far from Sgr A* Authors: Porquet, D.Predehl, P.Aschenbach, B.Grosso, N.Goldwurm, A.Goldoni, P.Warwick, R. S.Decourchelle, A. First Published: 1-Aug-2003 Publisher: EDP Sciences for European Southern Observatory (ESO) Citation: Astronomy & Astrophysics, 2003, 407 (1), pp. L17-L20 Abstract: We report the high S/N observation on October 3, 2002 with XMM-Newton of the brightest X-ray flare detected so far from Sgr A* with a duration shorter than one hour (~2.7 ks). The light curve is almost symmetrical with respect to the peak flare, and no significant difference between the soft and hard X-ray range is detected. The overall flare spectrum is well represented by an absorbed power-law with a soft photon spectral index of $\Gamma =2.5 \pm0.3$, and a peak 2-10 keV luminosity of 3.6 $^{+0.3}_{-0.4}\times 10 ^{35}$ erg s -1, i.e. a factor 160 higher than the Sgr A* quiescent value. No significant spectral change during the flare is observed. This X-ray flare is very different from other bright flares reported so far: it is much brighter and softer. The present accurate determination of the flare characteristics challenge the current interpretation of the physical processes occuring inside the very close environment of Sgr A* by bringing very strong constraints for the theoretical flare models. DOI Link: 10.1051/0004-6361:20030983 ISSN: 0004-6361 Links: http://hdl.handle.net/2381/26730http://www.aanda.org/articles/aa/abs/2003/31/aafe261/aafe261.html Version: Publisher Version Status: Peer-reviewed Type: Journal Article Rights: Copyright © 2003 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO. Appears in Collections: Published Articles, Dept. of Physics and Astronomy

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