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Chandra Science Highlight Stephan’s Quintet: A Compact Group of Galaxies about 280 Million Light Years from Earth Chandra X-ray Observatory ACIS Image. • • • The X-ray image shows gas heated by a shock wave produced by a spiral galaxy (B) moving through the intergalactic gas in the group at more than 1000 km/s. The relatively low gas temperature of 6 MK could be an indication that the intergalactic gas was preheated, presumably by previous encounters. In Stephan’s Quintet collisions of the galaxies with each other and with the hot gas are stripping cool gas from spiral galaxies and transforming them into elliptical galaxies. Reference: G. Trinchieri et al. 2003 Astron. & Astrophys. (in press) astro-ph 0302590 Credit: X-ray: NASA/CXC/INAF-Brera/G.Trinchieri et al.; Optical: Pal.Obs. STScI DSS) In the upper left a Chandra X-ray Observatory image (blue) is superimposed on a Digitized Sky Survey optical image (yellow). The group consists of the galaxies A, B, C, D and E shown in the wide field optical image. The largeappearing galaxy F in the lower left of this image is a foreground galaxy, and is not part of the group. CXC operated for NASA by the Smithsonian Astrophysical Observatory May 2003