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VLBA observation of a radio intraday flare of Sgr A*
Author(s) -
Miyoshi Makoto,
Imai Hiroshi,
Nakashima Junichi,
Deguchi Shuji,
Shen ZhiQiang
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200385072
Subject(s) - physics , flare , astrophysics , flux (metallurgy) , astronomy , metallurgy , materials science
We report here the results of a 7‐hour VLBA observation of Sgr A* at 43 GHz on July 31 2001, when Sgr A* showed an intraday flux variation at mm‐wave length. The flux density increased from 1Jy to 3 Jy, and the duration is about 10 4 seconds which is quite similar to its X‐ray flaring that Chandra detected. VLBA snapshot mappings show that Sgr A* flared and jets appeared in opposite two directions (northsouth) with nearly light velocity. The lengths of jets reached about 15AU at most. The jets were the origin of its rapid increase of radio flux density.