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In Support Of Galacitic Unification

In this artist's impression. A supermassive black hole and the accretion disk (pink) of matter falling toward the black hole. Photo by Meg Urry (Yale) and John Godfrey (STScI).
New Haven - Jun 02, 2003
Despite a decade of efforts to find flaws in the unification theory of active galaxies, the theory correctly explains the exotic phenomena of accreting supermassive black holes, argues Yale astronomer Meg Urry.

"Furthermore, the striking parallels between normal and active galaxies that have become apparent in the last few years," said Meg Urry, professor of physics at Yale and director of the Yale Center for Astronomy and Astrophysics, "suggest that there is a larger 'Grand Unification' at play. Apparently every galaxy goes through an active phase."

Urry spoke at the American Astronomical Society meeting in Nashville, Tenn last week.

Urry said the Grand Unification theory predicts what objects should appear in very deep multi-wavelength views of the universe. "Most of the active galaxies in the early universe have been hidden from view until now," she said. "We predict there are far more hidden black holes than brightly shining active galaxies."

New multi-wavelength surveys involving unique space observatories provide a way to test the Grand Unification theory, she said. Three of the National Aeronautics and Space Administration (NASA) space observatories -- the Hubble Space Telescope and the Chandra X-Ray Observatory, both already in orbit, and the Space Infrared Telescope Facility, due to be launched in August -- are critically important because they allow very deep imaging from far-infrared to X-ray wavelengths, where active galaxies and star-forming galaxies radiate most of their energy.

Preliminary results from the first two observatories are encouraging.

"The new challenge is to understand in detail how galaxy formation -- the gravitational collapse of a galaxy -- is tied to star formation in that galaxy and to accretion onto the black hole at its center," she said.

"Now we think all these processes are happening simultaneously, in the same objects. As a galaxy forms and collapses under the weight of its own gravity, it stimulates both intense star formation and the dumping of gas and stars onto the seed black hole at the center of the gravitational potential well."

"The galaxy starts collapsing, makes stars and makes an active nucleus," Urry said. "The violent events of this collapse dump matter onto the black hole and this releases a lot of energy. All these wild things are happening at once."

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Tiny Galaxies Once Roared In The Universe, Say Scientists
Boulder - May 27, 2003
Astronomers led by the University of Colorado and Carnegie Observatories have shown that a miniature galaxy less than one-hundredth the size of the Milky Way is ejecting large quantities of gas and energy into huge regions of intergalactic space.



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