The Dark Mass at the Center of the Milky Way:. NIR and X-Ray Flare Emission from SGR A*

Details The Dark Mass at the Center of the Milky Way:. NIR and X-Ray Flare Emission from SGR A* The Dark Mass at the Center of the Milky Way:. NIR and X-Ray Flare Emission from SGR A*

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dmap.conf..405e&link_type=abstract

DARK MATTER IN ASTROPARTICLE AND PARTICLE PHYSICS. Proceedings of the 6th International Heidelberg Conference. Held 24-28 Septem

Physics

Black Hole Physics, Accretion, Accretion Disks, Galactic Center

Scientific paper

We report on recent near-infrared and X-ray observations of the SgrA* counter-part associated with the super massive 3-4 × 106M&sun; black hole at the Galactic Center. The goal is the investigation of the variable emission from SgrA*. The observations have been carried out using the NACO adaptive optics (AO) instrument at the European Southern Observatory's Very Large Telescope (July 2005, May 2007) and the ACIS-I instrument aboard the Chandra X-ray Observatory (July 2005). We report on a polarized NIR are synchronous to a 8 × 1033 erg/s X-ray are in July 2005, and a new are in May 2007 that shows the highest sub-flare to flare contrast observed until now. The observations can be interpreted in a model involving a temporary disk with a short jet. In the disk component the quasi-periodic flux density variations can be explained due to spots on relativistic orbits around the central super massive black hole. The profile variations for the May 2007 flare are interpreted as a variation of the spot structure due to differential rotation within the disk.

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