Fig13_4 Merging galaxies

Fig13_4 Merging galaxies

Fig. 13.4 . Two spiral galaxies (left), each represented by M 81, can merge to form an elliptical galaxy. A pair of colliding galaxies (right), designated NGC 6240, illustrates such a merger just before becoming a single larger galaxy. The prolonged violent collision has drastically altered the shape of both galaxies and created large amounts of heat and infrared radiation. All of these images have been taken with the infrared camera aboard the Spitzer Space Telescope, with the inclusion of optically visible data for M81 taken from the Hubble Space Telescope. (Courtesy on NASA/JPL-Caltech/U. Az./CfA/NOAO/AURA/NSF (left) and NASA/JPL-Caltech/STScI-ESA (right).]

Copyright 2010, Professor Kenneth R. Lang, Tufts University