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We report the detection of radio QPOs with structure changes using the Very Long Baseline Array (VLBA) at 43 GHz. We found conspicuous patterned changes of the structure with $P$$=$ 16.8$\ \pm\ $1.4, 22.2$\ \pm\ $1.4, 31.4$\ \pm\ $1.5, 56.4$\ \pm\ $6 min roughly in a 3:4:6:10 ratio. The first two periods show a rotating one-arm structure, while $P$$=$ 31.4 min shows a rotating 3-arm structure, as ...

Oscillation Phenomena in the Disk around the Massive Black Hole Sagittarius A*

Oscillation Phenomena in the Disk around the Massive Black Hole Sagittarius A^*