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American Astronomical Society, Astrophysical Journal Letters, 1(798), p. L6, 2014

DOI: 10.1088/2041-8205/798/1/l6

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No Microwave Flare of Sagittarius A* around the G2 Periastron Passing

Journal article published in 2014 by Masato Tsuboi, Yoshiharu Asaki, Osamu Kameya, Yoshinori Yonekura, Yusuke Miyamoto ORCID, Hiroyuki Kaneko ORCID, Masumichi Seta, Naomasa Nakai, Hiroshi Takaba, Ken-Ichi Wakamatsu, Makoto Miyoshi, Yoshihiro Fukuzaki, Kenta Uehara, Mamoru Sekido
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

In order to explore any change caused by the G2 cloud approaching, we have monitored the flux density of Sgr A* at 22 GHz from Feb. 2013 to Aug. 2014 with a sub-array of Japanese VLBI Network . The observation period included the expected periastron dates. The number of observation epochs was 283 days. We have observed no significant microwave enhancement of Sgr A* in the whole observation period. The average flux density in the period is $S=1.23+/-0.33$ Jy. The average is consistent with the usually observed flux density range of Sgr A* at 22 GHz. ; Comment: Accepted for publication in Astrophysical Journal Letters, 14 pages, 1 figure