Falcke, H.: Radio Variability of Sgr A*
Radio Variability of Sgr A* at Centimeter Wavelengths
1Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2Steward Observatory, The University of Arizona, Tucson, AZ 85721
to appear in: "The Central Parsecs of the Galaxy", eds. H. Falcke, A. Cotera, W. Duschl, F. Melia, M. Rieke, ASP Conf. Series
Results of two years of continuous monitoring of flux density
variations at 8.3 and 2.25 GHz of the Galactic Center super-massive
black hole candidate Sgr A* are reported. The average RMS modulation
indices are 6% and 2.5% at 8.3 & 2.3 GHz respectively. There is a
certain degree of correlation between both frequencies. The timescale
of variability at 8.3 & 2.3 GHz is between 50 and 200 days. We
cannot confirm a lambda2 dependence of the timescale. At 2.25 GHz
a quasi-periodic behaviour with a period of 57 days was discovered
which is reminiscent to, though longer than those found in some
compact extragalactic radio sources.
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