We present results from observations of NH _ { 3 } ( 1,1 ) , ( 2,2 ) , ( 3,3 ) , and ( 6,6 ) with the Very Large Array .
The data sample the inner 10 pc ( 4 ^ { \prime } ) of the Galaxy and have a velocity coverage of –140 to +130 km s ^ { -1 } .
The velocity integrated NH _ { 3 } ( 3,3 ) image shows that the Sgr A East supernova remnant is impacting the 50 km s ^ { -1 } GMC in the northeast , the northern ridge in the north , and the western streamer in the west .
These results imply that the Sgr A East has a large effect on the molecular environment near Sgr A* and may be pushing much of the molecular gas away from Sgr A* .
The physical properties of the western streamer and its relation to Sgr A East are discussed in detail .
We also summarize the detection of hot molecular gas less than 2 pc from Sgr A* in projected distance .
This gas is seen only in NH _ { 3 } ( 6,6 ) and has line widths of 75–85 km s ^ { -1 } , indicating that it is physically close to the nucleus .