AbstractSagittarius 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 for 1–2h. For the first time, such an event also benefitted from a soft -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.
Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole
Advances in Space Research ; 45 , 4 ; 507-520
2009-09-30
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole
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