mei 072013
Anne's Picture of the Day: Interacting Galaxies Arp 81

May 7, 2013 Arp 81, interacting galaxies in Draco Image Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration and W. Keel (University of Alabama, Tuscaloosa) Arp 81 (also designated UGC 11175 and VV 247) is a strongly interacting pair of spiral galaxies, consisting of NGC 6621 (right) and NGC 6622 (left) seen about 100 [continue reading]

mei 052013
Anne's Picture of the Day: Spiral Galaxy NGC 4013

May 5, 2013 NGC 4013, an edge-on spiral galaxy in Ursa Major Image Credit & Copyright: R. Jay GaBany, Cosmotography ( NGC 4013 is a barred spiral galaxy of some 100 thousand light-years across, located about 55 million light-years away from Earth in the constellation of Ursa Major (also known as the Big Dipper), while [continue reading]

feb 182013
Anne's Picture of the Day: Interacting Galaxies IC 883

February 18, 2013 IC 883, the remnant of two interacting galaxies Image Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University) IC 883 (also known as Arp 193) is the bright remnant of two interacting galaxies located some 300 million light-years away toward the constellation of Canes [continue reading]

okt 252012
Mysterious Infrared Background Glow Comes From Stray Stars

  A new study using data from NASA’s Spitzer Space Telescope suggests a cause for the mysterious glow of infrared light seen across the entire sky. It comes from isolated stars beyond the edges of galaxies. These stars are thought to have once belonged to the galaxies before violent galaxy mergers stripped them away into [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]

jun 122012
Our Neighbor Galaxies Had a Close Encounter

  Two of our Milky Way’s neighbor galaxies may have had a close encounter billions of years ago, recent studies with the National Science Foundation’s Green Bank Telescope (GBT) indicate. The new observations confirm a disputed 2004 discovery of hydrogen gas streaming between the giant Andromeda Galaxy, also known as M31, and the Triangulum Galaxy, [continue reading]