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]

mrt 122013
Extremely Rare Triple Quasar Discovered

  For only the second time in history, a team of scientists including Michele Fumagalli from the Carnegie Institution for Science in the United States have discovered an extremely rare triple quasar system. Their work is published in the Oxford University Press journal Monthly Notices of the Royal Astronomical Society. An infrared image of the [continue reading]

mrt 052013
Anne's Picture of the Day: Interacting Galaxies Arp 299

March 5, 2013 Arp 299, interacting galaxies in Ursa Major Image Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University) Arp 299, consisting of IC 694 (left) and NGC 3690 (right), is an interacting pair of barred irregular galaxies that lie about 134 million light-years away in [continue reading]

okt 072012
Anne's Picture of the Day

October 7, 2012 Markarian 273, an ultraluminous infrared galaxy in Ursa Major Image Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University) Markarian 273 (also designated UGC 8696) is an ultraluminous infrared galaxy with a bizarre structure, located about 500 million light-years away in the constellation [continue reading]

sep 172012
Supernovae Now Counted

  Almost one in five exploding stars in nearby galaxies is simply not seen, astronomers have determined. For galaxies further out, that fraction doubles. This finding clears the way for these stellar beacons to be used as a good measure of how fast galaxies made stars earlier in the Universe’s history. Key evidence for this “body count” [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]