M31: The central region of our nearest neighbor spiral galaxy, at a distance of two million light years.
Caption: This image of the central region of the Andromeda Galaxy is a composite of Chandra X-ray data (3 pixilated sources) and Hubble optical data (red contours). A supermassive black hole is thought to be within the highest optical contour on the lower right. These highly accurate positions show that the very cool X-ray source (blue) previously identified with the supermassive black hole in the center of the galaxy is actually about 10 light years south of the center. A second, hotter X-ray source, is found to be at a position consistent with the position of the supermassive black hole.
Scale: X-ray Image is 1 arcmin on a side.
Chandra X-ray Observatory ACIS Image