Bulge and Nucleus of the Milky Way

The above picture shows the center of the Milky Way galaxy with the constellation Sagittarius superimposed on the image. The center of the Milky Way sits just above the spout of the teapot.

The bulge of the Milky Way is more spherical than the disk and is composed of stars which are more reddish than those in the disk (===>they are more evolved or low mass, but are still considered Pop I stars). The bulge is roughly 30,000 to 40,000 light years in diameter.

The central region of the Galactic Bulge (the nucleus) is quite interesting because it shows activity in type similar to that shown by Active Galactic Nuclei, AGNs (although at a considerably lower level).

Return to Lecture-2