Falcke, H.: Radio Variability of Sgr A*

Radio Variability of Sgr A* at Centimeter Wavelengths

Falcke H.1,2

1Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany (hfalcke@mpifr-bonn.mpg.de)
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

Abstract:

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.

Paper: Available in full length as PostScript and LaTex Format.

Other publications can be found here.

Questions: Heino Falcke, hfalcke@mpifr-bonn.mpg.de