Akiyama, K.
Multi-Epoch VERA Observations of Sagittarius A*. I. Images and Structural Variability
出版日:
2013-08
掲載誌・研究会:
PASJ
巻:
65
号:
4
ページ:
91
観測周波数:
43GHz
言語:
英文
査読:
査読有り
論文の配布サイト:
http://arxiv.org/abs/1308.6657 We report the results of multi-epoch observations of Sgr A* with VLBI Exploration of Radio Astrometry (VERA) at 43 GHz, carried out from 2004 to 2008. We detected a time variation of flux at 11 % level and intrinsic size at 19 %. In addition, comparisons with previous Very Long Baseline Array (VLBA) results shows that Sgr A* underwent the flaring event at least longer than 10 days in May 2007. The intrinsic size of Sgr A* remained unchanged within 1 σ level from the size before/after the flaring event, indicating that the brightness temperature of Sgr A* was increased.
