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View Full Version : Giant Ultraviolet Rings Found Around Ancient Galaxies



Fraser
2010-Aug-11, 06:50 PM
Title this 'Zombie Galaxies' or 'Night of the Living Galaxies.' Astronomers have found mysterious, giant loops of ultraviolet light around old, massive galaxies, which were presumed to be "dead," and these galaxies seem to have come back to life. Somehow these "over-the-hill galaxies" have been infused with fresh gas to form new stars that power [...]

More... (http://www.universetoday.com/70944/giant-ultraviolet-rings-found-around-ancient-galaxies/)

trinitree88
2010-Aug-13, 07:59 PM
Title this 'Zombie Galaxies' or 'Night of the Living Galaxies.' Astronomers have found mysterious, giant loops of ultraviolet light around old, massive galaxies, which were presumed to be "dead," and these galaxies seem to have come back to life. Somehow these "over-the-hill galaxies" have been infused with fresh gas to form new stars that power [...]

More... (http://www.universetoday.com/70944/giant-ultraviolet-rings-found-around-ancient-galaxies/)

Fraser. An interesting scenario. They're not dark stars emitting ultraviolet in the rings,... dark stars don't do that. Regular baryonic stars do, particularly when they are young and hot, like O,B and A stars. Those generally form in areas where the gas is diffuse, according to the standard scenario, with dense regions forming larger numbers of smaller red stars. That suggests that the halo containing them is extraordinarily extended, far beyond the "normal" light/mass radius. That in turn suggests that we have underestimated the radius at which the normal baryonic mass of the galaxy exists. So if it doesn't show up in H-alpha, and we are missing it in those surveys, what could it be?....molecular hydrogen, not atomic. A woeful underestimate of the mass, composition ,(such as CO tracer gas) and radius of molecular hydrogen gas clouds in the periphery of galaxies would lead one to conclude, as Zwicky did many moons ago, that the Keplerian mechanics of these galaxies' rotation curves had gone awry...far awry to the point of inventing "dark matter" to explain it. A first piece of the resolution to the dark matter problem, I'd say. Betcha a hot fudge sundae...three scoops of French vanilla ice cream (world's most gorgeous woman is French), hot fudge sauce, chopped walnuts, fresh whipped cream, double cherries on top, and those silly colored sprinkles, impregnated with fluorescing dyes and served under an .....ultraviolet light bulb. pete

Jerry
2010-Aug-16, 12:48 AM
As always, the universe is a what-you-see-is-what-you-get kinda place. It doesn't care what theories said 'old galaxies' should be like; much less if there is any real difference in age between young and old places.