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TIME AND SPACE
Astronomical Unifying Principle Created

Scientists can now describe all these different types of galaxies with mathematical precision.
by Staff Writers
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

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 Pasadena CA (SPX) Mar 06, 2007
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