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Astronomical Unifying Principle Created
UPI Correspondent Santa Cruz CA (UPI) Mar 08, 2007 U.S. astronomers have developed a unifying principle to describe all galaxies, from orderly spirals to chaotic mergers, with mathematical precision. University of California-Santa Cruz scientists found the relationship between a galaxy's mass and the orbital speed of its stars and gas is consistent over a wide range of galaxy morphologies and over billions of years of galaxy evolution. The researchers, using results from a major survey of distant galaxies, found certain fundamental properties of galaxies changed little during the past 8 billion years -- about half the age of the universe. "We think this trend reflects a regularity in the process that led to the formation of galaxies," said astronomy and astrophysics Professor Sandra Faber. "We are not sure where it comes from but it is a major constraint on galaxy formation." Faber, along with postdoctoral researcher Susan Kassin, determined the more massive a galaxy is, the faster the stars and gas within it move. They discovered the relationship by analyzing data from ground-based and space-based telescopes for 544 distant galaxies with a range of morphologies. The complex research is to be published in Astrophysical Journal Letters.
Source: United Press International Related Links Stellar Chemistry, The Universe And All Within It Understanding Time and Space
The First 3-D Map Of The Universe
Pasadena CA (SPX) Mar 06, 2007By analyzing the COSMOS field, the largest field of galaxies ever observed with the Hubble space telescope, an international team of scientists led by researchers from the California Institute of Technology (United States) and researchers from the associated laboratories of the CNRS and the CEA, made the first three-dimensional map of dark matter in the Universe using gravitational lensing effects. |
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