Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402..379m&link_type=abstract
Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
We performed the monitoring observations of the flux density toward Sagittarius A*, which is a compact radio source associated with a super-massive black hole located at the dynamical center of the Galaxy, using the Nobeyama Millimeter Array (NMA) and the Australia Telescope Compact Array (ATCA) at mm-wavelengths. Since 1996, the flux monitoring observations using the NMA were carried out in the 3- and 2-mm bands. Then we detected several flares of Sagittarius A* with typical durations of a few weeks. We also found some intraday variations (IDVs) of Sagittarius A* in both observing bands. The 3-mm flux observations of Sagittarius A* using the ATCA in the southern hemisphere were also carried out to detect IDVs with a longer observing window. In the ATCA observations, we detected IDVs of Sagittarius A* with timescale of a few hour. In these IDVs, the short flux-doubling timescale was estimated to be a few hours, constraining the physical size of flare-emitting region within about a few tens of AU.
Li Jiying
Miyazaki Akane
Miyoshi Makoto
Shen Zhi-Qiang
Tsuboi Masato
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