The attached wikisky.org image shows the bright star 3 Sgr near the top and the bright nebula Sh2-16 near the bottom.
SgrA* is at the bottom of the yellow line, between Sh2-16 and Sh2-17. North is at the top.
Info on SgrA* is at
http://en.wikipedia.org/wiki/Sagittarius_A*
A X-ray image is at
http://chandra.harvard.edu/photo/2003/0203long/