jul 202013
 
Link Between Stars' Ages and Their Orbits in Dense Cluster

  Astronomers using NASA’s Hubble Space Telescope have for the first time linked two distinct populations of stars in an ancient globular star cluster to their unique orbital dynamics, offering proof that the stars do not share the same birth date. The globular cluster 47 Tucanae. Image Credit & Copyright: Michael Sidonio (http://www.pbase.com/strongmanmike2002) The analysis of the [continue reading]

jul 042013
 
New Knowledge about Early Galaxies

  The early galaxies of the Universe were very different from today’s galaxies. Using new detailed studies carried out with the ESO Very Large Telescope and the Hubble Space Telescope, researchers, including members from the Niels Bohr Institute, have studied an early galaxy in unprecedented detail and determined a number of important properties such as [continue reading]

mei 262013
 
Galaxies Grow by Funnels of Cold Gas

  Computer simulations of galaxies growing over billions of years have revealed a likely scenario for how they feed: a cosmic version of swirly straws.  Created with the help of supercomputers, this still from a simulation shows the formation of a massive galaxy during the first 2 billion years of the Universe. Hydrogen gas is [continue reading]

mei 232013
 
Rare Galaxy Merger Gives New Insights of Galaxy Evolution

  A rare encounter between two gas-rich galaxies spotted by ESA’s Herschel space observatory indicates a solution to an outstanding problem: how did massive, passive galaxies form in the early Universe? Several telescopes have teamed up to discover a rare and massive merging of two galaxies that took place when the Universe was just 3 [continue reading]

mei 192013
 
Distant Starburst Galaxy Challenges Galaxy Evolution Theory

  ESA’s Herschel space observatory has discovered an extremely distant galaxy making stars more than 2000 times faster than our own Milky Way. Seen at a time when the Universe was less than a billion years old, its mere existence challenges our theories of galaxy evolution. Artist’s impression of starburst galaxy HFLS3. The galaxy appears [continue reading]

mei 032013
 
VLA Finds Background Radio Emission is Submitted by Galaxies

  Staring at a small patch of sky for more than 50 hours with the ultra-sensitive  Karl G. Jansky Very Large Array (VLA), astronomers have for the first time identified discrete sources that account for nearly all the radio waves coming from distant galaxies. They found that about 63 percent of the background radio emission [continue reading]