3
The (slightly) active nucleus of our galaxy
•Probable Black hole
–High velocities
–Large energy generation
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•At  a=275 AU  P=2.8 yr Þ 2.7 million solar masses
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•Radio image of Sgr A*
about 3 pc across, with model of surrounding disk
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From our text:  Horizons, by Seeds
Core star movie:  http://www.mpe.mpg.de/www_ir/GC/