Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4409t&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #44.09; Bulletin of the American Astronomical Society, Vol. 34, p.950
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Flux monitoring programs of Sagittarius A* at millimeter wavelengths were carried out from 1996 to 2001 using the Nobeyama Millimeter Array (NMA). Forty-six epochs of the observations was obtained at 3 mm and 2 mm. In 1996,1997,1998, and 2000, the observations were concentrated in a period of one to two months for each year with the epochs separated by a few days to a week in a single (intermediate resolution) array configuration in order to obtain identical spatial resolution among different epochs of the observations. From November 2000 to May 2001, the observations were performed in six consecutive months to investigate the variability of longer term. The light curve constructed from these data shows flares in March 1998 and in March 2000. The peaks of flares were 2-3 Jy at 3mm while the averaged quiescent flux was ~1Jy with the typical uncertainty of 15-20 %. We folded the NMA light curve with a quasi-period of 106 days determined from the analysis of the VLA data by Zhao, Bower and Goss (2001, ApJ, 547, L29). The folded data shows distinct high and low activity states.
Miyazaki Akane
Tsuboi Masato
Tsutsumi Takahiro
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