Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..439..294e&link_type=abstract
The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies. Proceedings of a workshop held at Shanghai, China on
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We summarize the results of recent radio to X-ray observations of Sagittarius A* (Sgr A*) with an emphasis on the near-infrared wavelength domain. 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. In the NIR the variable emission of Sgr A* is polarized and shows flares (flux density maxima) with a high intensity contrast modulations. The observations can be interpreted in the framework of a model involving a temporary disk with a short jet. The NIR variations may contain a significant contribution from an underlying physical process that can statistically be described as red-noise. In an accretion disk model this contribution may be interpreted in the framework of a multi-component structure in a differentially rotating disk which is occasionally dominated by a single hot-spot.
Baganoff Fred
Bremer Malcolm
Buchholz Rainer M.
Dovciak Michael
Duschl Wolfgang
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