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

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arxiv 1411.0746 v1 pith:3CDPGHSA submitted 2014-11-04 astro-ph.GA astro-ph.HE

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

Masato Tsuboi , Yoshiharu Asaki , Osamu Kameya , Yoshinori Yonekura , Yusuke Miyamoto , Hiroyuki Kaneko , Masumichi Seta , Naomasa Nakai
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Hiroshi Takaba Ken-ichi Wakamatsu Makoto Miyoshi Yoshihiro Fukuzaki Kenta Uehara Mamoru Sekido
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keywords densityfluxobservationperiodaveragemicrowaveobservedperiastron
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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.

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