jul 042013
Anne's Image of the Day: Merging Galaxies Arp 220

July 4, 2013 Arp 220, merging galaxies in Serpens Image Credit: ESA/NASA and WikiSky Arp 220 is the result of a collision between two galaxies which are now in the process of merging, situated some 250 million light-years away from Earth in the northern constellation of Serpens (the Serpent). It is receding from us at [continue reading]

jul 022012
Galaxy Harbours Many Star-Snacking Black Holes

  Astronomers have found evidence of hundreds of black holes in a galaxy 250 million light years away. The discovery, made with a worldwide network of radio telescopes, gives scientists a new way to find out how black holes are created. Three variable radio sources in Arp 220, a galaxy 250 million light years away. [continue reading]

jun 232012
Galaxy Developed from Multiple Mergers

  A team of astronomers led by Professor Yoshiaki Taniguchi (Ehime University) has concluded that the ultraluminous infrared galaxy (ULIRG) Arp 220 (Figure 1) developed from a multiple merger among four or more galaxies. Their new imaging data from the Subaru Telescope and optical spectroscopy from the W. M. Keck Observatory revealed two tidal tails [continue reading]