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Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole

Abstract : Sagittarius A★(SgrA★) is the supermassive black hole residing at the center of the Milky Way. It has been the main target of an extensive multiwavelength campaign we carried out in April 2007. Herein, we report the detection of a bright flare from the vicinity of the horizon, observed simultaneously in X-rays (XMM-Newton/EPIC) and near infrared (VLT/NACO) on April 4th for 1-2 h. For the first time, such an event also benefitted from a soft γ-rays (INTEGRAL/ISGRI) and mid infrared (VLT/VISIR) coverage, which enabled us to derive upper limits at both ends of the flare spectral energy distribution (SED). We discuss the physical implications of the contemporaneous light curves as well as the SED, in terms of synchrotron, synchrotron self-Compton and external Compton emission processes.
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http://hal.in2p3.fr/in2p3-00670184
Contributor : Régis Terrier <>
Submitted on : Tuesday, February 14, 2012 - 6:09:27 PM
Last modification on : Friday, October 30, 2020 - 12:04:03 PM

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G. Trap, A. Goldwurm, R. Terrier, K. Dodds-Eden, S. Gillessen, et al.. Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole. Advances in Space Research, Elsevier, 2010, 45, pp.507-520. ⟨10.1016/J.ASR.2009.09.025⟩. ⟨in2p3-00670184⟩

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