Skip to comments.Astronomers Discover Link Between Supermassive Black Holes and Galaxy Formation
Posted on 02/03/2009 7:54:14 AM PST by Ernest_at_the_Beach
Astronomers know that galaxies, those vast cities of millions or billions of stars, grow larger through collisions and mergers. Kormendy and Bender's work involves the biggest galaxies in the universe--"elliptical galaxies" that are shaped roughly like footballs and that can be made of as many as a thousand billion stars. Virtually all of these galaxies contain a black hole at their centers, that is, an infinitely dense region that contains the mass of millions or billions of Suns and from which no light can escape.
A current leading theory says that when galaxies collide, their black holes end up revolving around each other. Together, the two black holes act like an egg beater: They violently stir up the galaxy center with their incredibly strong gravity, and they fling stars out of the central regions. As the black hole pair sinks to the center of the new merger remnant, this supergalaxy's core is depleted of the stars that were flung away. Kormendy and Bender measured the resulting dimming of such galaxies' cores, their so-called "light deficits."
(Excerpt) Read more at physorg.com ...
Black holes aren’t black, they’re photon impared.
Do these articles disagree?
Well, duh. I thought everyone knew this. We were just discussing this the other day here at the help desk.
· Google ·
I know that in the world of laymen there are “black hole skeptics”, those who doubt black holes even exist.
I’m not one of those.
But I do have a question regarding black holes at the centers of distant galaxies. How are they detected? What evidence to astronomers have for the assertion that every galaxy has a black hole at its center?
I’m not doubting. I just don’t know the answer.
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