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25 April 2024

» arxiv » 0810.0168

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Coordinated multi-wavelength observations of Sgr A*
A. Eckart ; R. Schoedel ; F. K. Baganoff ; M. Morris ; T. Bertram ; M. Dovciak ; D. Downes ; W. J. Duschl ; V. Karas ; S. Koenig ; T. Krichbaum ; M. Krips ; D. Kunneriath ; R-S. Lu ; S. Markoff ; J. Mauerhan ; L. Meyer ; J. Moultaka ; K. Muzic ; F. Najarro ; K. Schuster ; L. Sjouwerman ; C. Straubmeier ; C. Thum ; S. Vogel ; H. Wiesemeyer ; G. Witzel ; M. Zamaninasab ; A. Zensus ;
Date:	1 Oct 2008
Abstract:	We report on recent near-infrared (NIR) and X-ray observations of Sagittarius A* (Sgr A), the electromagnetic manifestation of the ~4x10^6 solar masses super-massive black hole (SMBH) at the Galactic Center. The goal of these coordinated multi-wavelength observations is to investigate the variable emission from Sgr A in order to obtain a better understanding of the underlying physical processes in the accretion flow/outflow. 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 flare synchronous to a 8x1033 erg/s X-ray flare in July 2005, and a further flare in May 2007 that shows the highest sub-flare to flare contrast observed until now. The observations can be interpreted in the framework of a model involving a temporary disk with a short jet. In the disk component flux density variations can be explained due to hot spots on relativistic orbits around the central SMBH. The variations of the sub-structures of the May 2007 flare are interpreted as a variation of the hot spot structure due to differential rotation within the disk.
Source:	arXiv, 0810.0168
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