Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1766631 | Advances in Space Research | 2010 | 14 Pages |
Abstract
Sagittarius Aâ
(SgrAâ
) 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.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
G. Trap, A. Goldwurm, R. Terrier, K. Dodds-Eden, S. Gillessen, R. Genzel, E. Pantin, P.O. Lagage, P. Ferrando, G. Bélanger, D. Porquet, N. Grosso, F. Yusef-Zadeh, F. Melia,