February 3, 2013 Abell 2125, a galaxy cluster in Ursa Minor Image Credit: NASA/CXC Abell 2125 is a galaxy cluster that lies about 3 billion light-years away from Earth in the constellation of Ursa Minor, and is seen at a time about 11 billion years after the Big Bang, when many galaxy clusters are believed [continue reading]
January 26, 2013 Abell 2218, a galaxy cluster in Draco Image Credit: NASA, ESA, and Johan Richard (Caltech, USA) Acknowledgement: Davide de Martin & James Long (ESA/Hubble) Abell 2218 is a rich galaxy cluster that contains more than 10,000 galaxies, located some 2.35 billion light-years away (redshift 0.18) in the northern constellation of Draco. Redshift [continue reading]
KIPAC scientists use X-ray observations show how galaxies shape their environment, and vice-versa A major component of our understanding of galaxy evolution that has remained elusive is the influence of the local environment on the galaxy, especially when discussing galaxies in large clusters. Galaxy clusters, the largest gravitationally bound objects in the Universe, [continue reading]
January 13, 2013 The Train Wreck Cluster, a galaxy cluster in Orion Image Credit: NASA, ESA, CFHT, and M.J. Jee (University of California, Davis) The Train Wreck Cluster (Abell 520) is a galaxy cluster of 5.4 million light-years across that contains about 300 galaxies. It lies some 2.65 billion light-years away in the constellation of [continue reading]
December 25, 2012 CLG J02182-05102, an ancient galaxy cluster in Cetus Image Credit: NASA/JPL-Caltech/Subaru CLG J02182-05102 (also known as SXDF-XCLJ0218-0510) is a galaxy cluster that contains some 60 galaxies, located about 9.6 billion light-years away in the constellation of Cetus. For comparison, the much younger Local Group of which the Milky is a member, contains [continue reading]
Astronomers were puzzled earlier this year when NASA’s Hubble Space Telescope spotted an overabundance of dark matter in the heart of the merging galaxy cluster Abell 520. This observation was surprising because dark matter and galaxies should be anchored together, even during a collision between galaxy clusters. These composite images taken by two different [continue reading]