Six Years of Monitoring of the Sgr B2 Molecular Cloud with INTEGRAL

Details Six Years of Monitoring of the Sgr B2 Molecular Cloud with INTEGRAL Six Years of Monitoring of the Sgr B2 Molecular Cloud with INTEGRAL

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1126..355t&link_type=abstract

SIMBOL-X: FOCUSING ON THE HARD X-RAY UNIVERSE: Proceedings of the 2nd International Simbol-X Symposium. AIP Conference Proceedi

Physics

3

X-Ray Sources, X-Ray Bursts, Cosmic Rays, Galactic Center, Bar, Circumnuclear Matter, And Bulge, X-Ray

Scientific paper

Several molecular clouds around the Galactic Centre (GC) emit strong neutral iron fluorescence line at 6.4 keV, as well as hard X-ray emission up to 100 keV. The origin of this emission has long been a matter of controversy: irradiation by low energy cosmic ray electrons or X-rays emitted by a nearby flaring source in the central region. A recent evidence for time variability in the iron line intensity that has been detected in the Sgr B2 cloud favors the reflexion scenario. We present here the data obtained after 6 years of INTEGRAL monitoring of the GC. In particular, we show a lightcurve of Sgr B2 that reveals a decrease in the hard X-ray flux over the last years and discuss its implications. We finally discuss perspectives with Simbol-X.

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