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The 3-mm flux density monitoring of Sagittarius A* with the ATCA

Published online by Cambridge University Press:  01 October 2007

J. Li ,
Z. Q. Shen ,
A. Miyazaki ,
M. Miyoshi ,
T. Tsutsumi ,
M. Tsuboi ,
L. Huang  and
B. Sault
J. Li
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: lijuan@shao.ac.cn Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
Z. Q. Shen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: lijuan@shao.ac.cn Joint Institute for Galaxy and Cosmology of ShAO and USTC, Shanghai 200030, China
A. Miyazaki
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
M. Miyoshi
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
T. Tsutsumi
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
M. Tsuboi
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510, Japan
L. Huang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: lijuan@shao.ac.cn Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
B. Sault
Affiliation:
University of Melbourne, School of Physics, Parkville, Victoria 3052, Australia
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Abstract

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We have performed monitoring observations of the 3-mm flux density toward the Galactic center compact radio source Sgr A* with the ATCA since 2005 October. It has been found that during several observing epochs Sgr A* was quite active, showing significant intraday variation. Here we report the detection of an IDV in Sgr A* on 2006 August 13, which exhibits a 27% fractional variation in about 2 hrs.

Keywords

Galaxy: centertechniques: interferometric

References

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