The Variability of Sagittarius A* at 3 Millimeters

Details The Variability of Sagittarius A* at 3 Millimeters The Variability of Sagittarius A* at 3 Millimeters

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341101s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #411.01; Bulletin of the American Astronomical Society, Vol. 41, p.216

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Scientific paper

We have performed monitoring observations of the 3-mm flux density toward the Galactic center compact radio source Sgr A* with the Australia Telescope Compact Array (ATCA) since 2005 October. Careful calibrations of both elevation-dependent and time-dependent gains have enabled us to establish the variability behavior of Sgr A*. Sgr A* was found to be quite active, clearly showing intraday variation (IDV). We report the two detected IDV events. One is on 2006 August 12 when Sgr A* exhibited a 33 % fractional variation in about 2.5 hr. The other is on 2006 August 13 when two peaks separated by about 4 hr, with a maximum variation of 22 % within 2 hr, were seen. Such short timescale variations are discussed in light of two possible theoretical scenarios, i.e., the orbiting hot spot model and the expanding plasmon model.

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