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| Paper: |
Coordinated Multi-Wavelength Observations of Variable Emission
from the Galactic Center |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
294 |
| Authors: |
Eckart, A.; Zamaninasab, M.; Sabha, N.; García-Marín, M.; Kunneriath, D.; Straubmeier, C.; Muzic, K.; Witzel, G.; Bremer, M.; Valencia-Schneider, M.; Karas, V.; Dovciak, M.; Morris, M. R.; Baganoff, F.; Schödel, R.; Moultaka, J.; Buchholz, R. M.; Duschl, W.; Zensus, A. |
| Abstract: |
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. |
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