nov 212012
 
Bridge of Hot Gas Links Two Galaxy Clusters

  ESA’s Planck space telescope has made the first conclusive detection of a bridge of hot gas connecting a pair of galaxy clusters across 10 million light-years of intergalactic space. A bridge of hot gas between galaxy clusters Abell 399 and Abell 401. Credit: Sunyaev-Zel’dovich effect (orange): ESA & Planck Collaboration; optical image: STScI Digitized [continue reading]

okt 262012
 
Giant Galaxy Stirred Up By Black-hole Mischief?

  Astronomers using NASA’s Hubble Space Telescope have obtained a remarkable new view of a whopper of an elliptical galaxy that may have been puffed up by the actions of one or more black holes in its core. The giant elliptical galaxy, dubbed A2261-BCG,  in the center of this image, taken by NASA’s Hubble Space Telescope, [continue reading]

okt 092012
 
Cosmic Blender Churns Galaxy Cluster

  Scientists have used a suite of X-ray observations to find evidence of large scale swirling gas motion in the Perseus galaxy cluster. The Perseus Cluster, located 237 million light-years away in the constellation of Perseus, contains thousands of galaxies immersed in a vast cloud of multimillion degree gas. Image Credit: Jean-Charles Cuillandre (CFHT) & Giovanni [continue reading]

okt 032012
 
Active Galaxies Avoid Living Near Centers of Galaxy Clusters

  A population study of active galaxies in X-rays shows that they get discouraged from living near the centers of galaxy clusters, and that there is an important interplay between gas inside and outside the galaxies. Chandra X-ray counts image for the galaxy cluster MACS J1931.8-2634 showing the diffuse X-ray emisstion from the hit cluster [continue reading]

aug 162012
 
Phoenix Cluster is Breaking Cosmic Records

  Astronomers have found an extraordinary galaxy cluster, one of the largest objects in the Universe, that is breaking several important cosmic records. Observations of the Phoenix cluster (SPT-CLJ2344-4243) with NASA’s Chandra X-ray Observatory, the National Science Foundation’s South Pole Telescope, and eight other world-class observatories may force astronomers to rethink how these colossal structures and [continue reading]

aug 092012
 
Lots of Dark Matter Near the Sun

  Astronomers at the University of Zürich and the ETH Zürich, together with other international researchers, have found large amounts of invisible “dark matter” near the Sun. Their results are consistent with the theory that the Milky Way Galaxy is surrounded by a massive “halo” of dark matter, but this is the first study of [continue reading]