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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Sagittarius A {black star} (Sgr A {black star} ) 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 4 th 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.

Original languageEnglish (US)
Pages (from-to)507-520
Number of pages14
JournalAdvances in Space Research
Issue number4
StatePublished - Feb 15 2010


  • Black hole physics
  • Galaxy: center
  • Gamma rays: observations
  • Infrared: general
  • Radiation mechanisms: non-thermal
  • X-rays: general

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • General Earth and Planetary Sciences


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