학술논문
No Microwave Flare of Sagittarius A* around the G2 Periastron Passing
Document Type
Working Paper
Author
Source
Subject
Language
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
Comment: Accepted for publication in Astrophysical Journal Letters, 14 pages, 1 figure