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We have performed the observation of the "Galactic Center Mini-spiral(GCMS)"in H42alpha recombination line as a part of the first large-scale mosaicobservation in the Sagittarius A complex using AtacamaMillimeter/sub-millimeter Array (ALMA). We revealed the kinematics of theionized gas streamers of the GCMS. We found that the ionized gas streamers ofthe Northern Arm(NA) and Eastern Arm(EA) in their outer regions somewhatdeviate from the Keplerian orbits which were derived previously from thetrajectories in the inner regions. In addition, we found that the streamercorresponding to the Bar of the GCMS has a Keplerian orbit with an eccentricityof e~0.8, which is independent from the Keplerian orbits of the other streamersof the GCMS. We estimated the LTE electron temperature and electron density inthe ionized gas streamers. We confirmed the previously claimed tendency thatthe electron temperatures increase toward Sgr A*. We found that the electrondensity in the NA and EA also increases with approaching Sgr A* without thelateral expansion of the gas streamers. This suggests that there is someexternal pressure around the GCMS. The ambient ionized gas may cause theconfinement and/or the perturbation for the orbits. There is a good positionalcorrelation between the protostar candidates detected by JVLA at 34 GHz and theionized gas streamer, Northeastern Arm, newly found by our H42alpharecombination line observation. This suggests that the candidates had formed inthe streamer and they were brought to near Sgr A* as the streamer falls.

ALMA View of the Galactic Center Mini-spiral: Ionized Gas Flows around Sagittarius A*