Paper:	Origin of Sgr A East: Hypernova?
Volume:	362, The Seventh Pacific Rim Conference on Stellar Astrophysics
Page:	158
Authors:	Lee, S.; Pak, S.; Lee, S.-G.; Geballe, T.R.; Choi, M.; Davis, C.J.; Herrnstein, R.M.; Minh, Y.C.
Abstract:	We have observed H2 1−0 S(1) (2.1218μm) and 2−1 S(1) (2.2477μm) emission line spectra from the interaction regions between Sgr A East and the surrounding molecular clouds in the central 10 pc of the Galaxy. From the shock velocities (≅ 100 km s−1) of Sgr A East, estimated by comparing H2 line profiles with those of NH3, we derive an initial explosion energy of 0.2-4 ×1053 ergs. Such a high range energy excludes the hypothesis of a single typical supernova for the origin of Sgr A East. Instead, we suggest a collapsar or microquasar.

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