Release Images

Release No.: 2010-07
For Release: Tuesday, May 25, 2010 - 5:00am

Nearby Black Hole is Feeble and Unpredictable

Andromeda Galaxy (M31)

The large image here shows an optical view, with the Digitized Sky Survey, of the Andromeda Galaxy, otherwise known as M31. The inset shows Chandra images of a small region in the center of Andromeda. The image on the left shows a sum of Chandra images taken before January 2006 and the image on the right shows a sum of images taken after January 2006. Before 2006, three X-ray sources are clearly visible, including one faint source close to the center of the image. After 2006, a fourth source, called M31*, appears just below and to the right of the central source, produced by material falling onto the supermassive black hole in M31.

X-ray (NASA/CXC/SAO/Li et al.), Optical (DSS)