Journal
ADVANCES IN SPACE RESEARCH
Volume 45, Issue 4, Pages 507-520Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2009.09.025
Keywords
Black hole physics; Radiation mechanisms: non-thermal; Galaxy: center; Gamma rays: observations; Infrared: general; X-rays: general
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Funding
- French Agence Nationale pour la Recherche [ANR-06-JCJC-0047]
- NASA [NNX08AX33G, NNX08AX34G]
- ESA Member States
- NASA [93604, NNX08AX33G, 93612, NNX08AX34G] Funding Source: Federal RePORTER
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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 gamma-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. (C) 2009 COSPAR. Published by Elsevier Ltd. All rights reserved.
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