"A New Species" of Strange Weirdly-Shaped Galaxies The Daily Galaxy --Great Discoveries Channel: Sci, Space, TechFollow the Daily Galaxy
« Image of the Day: Jupiter's Ganymede --Only Moon in Solar System with a Magnetic Field |Main| Image of the Day: Billions of Years of Mars' History Etched into Mount Sharp's Layers »September 02, 2012 "A New Species" of Strange Weirdly-Shaped Galaxies
A full-sky survey by Nasa's wide-field Wise telescope turned up about 1,000 hot, dust-obscured galaxies, each of which emit as much light as 100 trillion sun-like stars.The objects are rare, accounting for about one in 100,000 light sources, and difficult to find since most of their energy is masked by dust.Astronomers believe the objects, which are twice as warm as similar galaxies, may be a transitional state between disk-shaped galaxies, like the Milky Way, and elliptical galaxies.
Most of these galaxies found by Wise are about 10 billion light years away, meaning they formed when the universe was a fraction of its present age.Scientists suspect conditions in the early universe were more conducive for seeding and growing these hot galaxies, but they are not ruling out that the phenomenon could occur today."There is either just a weird set of circumstances that rarely comes up, or a common set of circumstances that comes up for only a very short period of time," that allows them to form, said Wise project scientist Peter Eisenhardt of Nasa's Jet Propulsion Laboratory in Pasadena, California.
Because the galaxies do not have enough stars to account for all their heat, scientists suspect they may contain unusually active super-massive black holes, which are regions of space so dense with matter that not even light can escape the grip of gravity.At times, black holes feed on surrounding material, providing telltale signs of their existence.
All galaxies are believed to host a black hole, though some, such as Sagittarius A, located at the center of the Milky Way, are relatively dormant, at least at the present time.Scientists estimate Sagittarius A contains 4 million times the mass of the sun. Other black holes are substantially larger, approaching 10 billion times the sun's mass.
Among the 563 million infrared objects detected by Wise during its two-year mission are millions of super-massive black holes. The findings, which were unveiled during a conference call with reporters last night, are being published in the Astrophysical Journal.
The Daily Galaxy via NASA/Wise
Posted at 05:00 AM | PermalinkComments
Type 4 civilizations?
Posted by:Riz |August 31, 2012 at 09:12 PMWhat shape are galaxies? The front is 100000 light years in a different place from the back and as we don't know which way it's moving we can't work out what shape it is (If it is a galaxy at all and not just random stars put together by light speed distance differential).
Posted by:John Dyball |September 02, 2012 at 10:29 AMPost a comment
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