This image is about five times deeper than any previous high resolution X-ray image and it reveals some new features. From a project of Hughes. Image of M33, a Local Group spiral galaxy, obtained with the CCD camera on the Serin 20-inch telescope. Courtesy of T. Williams. N-body simulation of the merger of two black holes, showing the transformation of two density cusps into one.
Projection is onto the initial orbital plane.
The two cusps remain nearly intact until after the black holes form a hard binary, at which point the density drops suddenly. From a project of Merritt, Cruz and Milosavljevic. On the left is an image of the southern barred galaxy NGC 4123 taken in the I-band. They conclude that the disk is massive enough to account for all the central attraction in the inner part of this galaxy and that the dark matter halo must have a very low central density - a result which is inconsistent with predictions from the popular Cold Dark Matter model of galaxy formation. From a project of Hughes.