Galaxy Cluster MACS J0717

Galaxy Cluster MACS J0717 April 16, 2009: The most crowded collision of galaxy clusters has been identified by combining information from three different telescopes. This result gives scientists a chance to learn what happens when some of the largest objects in the universe go at each other in a cosmic free-for-all. Using data from NASA's Chandra X-ray Observatory, Hubble Space Telescope, and the Keck Observatory in Hawaii, astronomers were able to determine the three-dimensional geometry and motion in the system MACS J0717.5+3745 (or MACS J0717, for short), located about 5.4 billion light-years from Earth. About the Object Object Name: MACS J0717.5+3745 Object Description: Cluster of Galaxies Position (J2000): R.A. 07h 17m 33s.80 Dec. +37° 45' 20".02 Constellation: Auriga Distance: 5.4 billion light-years or 1.7 billion parsecs Dimensions: The image is roughly 4.5 arcminutes (7.7 million ________________________light-years or 2.4 megaparsecs) wide. About the Chandra Data Data Description: Chandra data used were from proposal 4200. Instrument: ACIS Exposure Date(s): January 10, 2003 Energies: 5 - 25 T(keV) About the Hubble Data Data Description: The Hubble images were created from HST data from proposal ________________________10420: PI: Dr. H. Ebeling (University of Hawaii), I. Smail ________________________(University of Durham, UK), J.-P. Kneib (Laboratoire ________________________d'Astrophysique de Marseille, France), G. Smith ________________________(University of Birmingham, UK), and D. Donovan and E. ________________________Barrett (University of Hawaii). Instrument: ACS/WFC Exposure Date(s): January 24, 2005 - February 9, 2005 Filters: F606W (V) and F814W (I) About the Release Credit: NASA, ESA, CXC, C. Ma, H. Ebeling, and E. Barrett (University of Hawaii/IfA), et al.,and STScI Release Date: April 16, 2009 Color: The image is a composite of separate exposures made by the ACS instrument on the Hubble Space Telescope and the ACIS instrument onboard the Chandra X-ray Observatory. Two filters were used to sample broad wavelength ranges. A continuous energy band was used to sample the X-ray data. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: Hubble: F606W (V) cyan Hubble: F814W (I) yellow Chandra: 5 - 25 T(keV) temperature map blue through violet

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