Flares of Sagittarius a* at Millimeter Wavelengths

Details Flares of Sagittarius a* at Millimeter Wavelengths Flares of Sagittarius a* at Millimeter Wavelengths

2005-12-28

arxiv.org/abs/astro-ph/0512625v1

Astronomy and Astrophysics

Astrophysics

4 pages. Presented at the XXVIIIth Geleral Assembly of the URSI, Oct 2005, India

Scientific paper

We have performed monitoring observations of the flux density toward the Galactic center compact radio source, Sagittarius A* (Sgr A*), which is a supermassive black hole, from 1996 to 2005 using the Nobeyama Millimeter Array of the Nobeyama Radio Observatory, Japan. These monitoring observations of Sgr A* were carried out in the 3- and 2-mm (100 and 140 GHz) bands, and we have detected several flares of Sgr A*. We found intraday variation of Sgr A* in the 2000 March flare. The twofold increase timescale is estimated to be about 1.5 hr at 140 GHz. This intraday variability suggests that the physical size of the flare-emitting region is compact on a scale at or below about 12 AU (~150 Rs; Schwarzschild radius). On the other hand, clear evidence of long-term periodic variability was not found from a periodicity analysis of our current millimeter data set.

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