천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제40권2호
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- Pages.38.4-39
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- 2015
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- 1226-2692(pISSN)
KaVA Q-band Monitoring of Sgr A* in 2013-2014
- Zhao, Guang-Yao (Korea Astronomy and Space Science Institute) ;
- Akiyama, Kazunori (National Astronomical Observatory of Japan) ;
- Kino, Motoki (Korea Astronomy and Space Science Institute) ;
- Sohn, Bong Won (Korea Astronomy and Space Science Institute)
- 발행 : 2015.10.15
초록
We have been monitoring Sgr A*, the radio source at the center of our galaxy, continuously since G2 encounter was predicted. KaVA is a powerful High resolution imaging array at K and Q band, and it has a excellent uv-coverage for Sgr A*. Together with 1-Gbps recording, our observations have provided high-quality images of Sgr A* at Q-band. Our images reveal a scatter-broadened, elliptical Gaussian structure of the source. We found no significant flux or structural variation of Sgr A* in 2013-2014, which is consistent with recent simulations by Kawashima et al. Continuous monitoring in the coming few years would be able to capture the possible flux increase in the source caused by G2, which will lead to better understanding of the accretion process around supermassive black holes.
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