Radio Variability of Sgr A* at Centimeter Wavelengths

Details Radio Variability of Sgr A* at Centimeter Wavelengths Radio Variability of Sgr A* at Centimeter Wavelengths

1999-09-27

arxiv.org/abs/astro-ph/9909441v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, (PASP)Latex, in: "The Central Parsecs of the Galaxy", eds. H. Falcke, A. Cotera, W.J. Duschl, F. Melia, M.

Scientific paper

Results of two years of continuous monitoring of flux density variations at 8.3 and 2.3 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 lambda^2 dependence of the timescale. At 2.3 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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