Sgr A* is the supermassive black hole housed at the Galactic Center. Its non-thermal X-ray counterpart is variable and exhibits rapid flares about once per day. Besides, a soft y-ray source discovered by INTEGRAL apparently coincident with Sgr Az.ast;, IGR J17456-2901, might be related to the X-ray emission. To gain more indsight on the possible links between X-rays and y-rays, a new joint XMM-Newton/INTEGRAL campaign on the Galactic Center was performed in April 2007. Here, we report the INTEGRAL ∼100 ks long observation of this campaign. For the first time, a bright X-ray flare from Sgr A* detected by XMM-Newton (∼16.1 × 10-12 erg s-1 cm-2, 2-10 keV) fell into INTEGRAL observing time. However, no evidence for variability was found by INTEGRAL/ISGRI, neither in the 20-40 nor in the 40-100 keV band, for which we place 3σ upper limits on the flare's flux of 3.63 and 3.60 × 10 -11 erg s-1 cm-2, respectively.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2008|
|Event||7th INTEGRAL Workshop - An INTEGRAL View of Compact Objects, INTEGRAL 2008 - Copenhagen, Denmark|
Duration: Sep 8 2008 → Sep 11 2008
ASJC Scopus subject areas