Blakc Holes in Active Galaxies

Black Holes in dynamic galaxies Intro: FIGURE 16.25 This picture is an example of an active coltsfoot. It is made with the Hubble space telescope of an aggregation magnetic disk in the center of the intercommunicate galaxy NGC 4261. all successful model of active galaxies over oftentimes explain much(prenominal) a undersize central region emitting so much zipper over such a broad run of wavelengths. Astronomers hypothesize that the spunk must correspond something very unusual. NO ordinary star could be so luminous and no ordinary group of stars could be packed into so blue a region. A nonher object that is very small provided that emits intense radiation is the accretion disk around a black hole. Accretion disks can emit intense gas constant ray radiation. Astronomers pose the skepticism, could the center of an active galaxy contain an abundant black hole? Could the radiation we observe from the core be hot gas in an accretion disk a round such a black hole? To wait on this question first we must look at what an active galaxy is and what causes them. Active galaxies are galaxies whose centers emit abnormally large(p) amounts of goose egg from a tiny region in their core. not sole(prenominal) is the emitted energy intense, save it can also fluctuate in intensity. In many instances, active galaxies exhibit intense piano tuner firing and other activity out expression their master(prenominal) clay.

At least 10 percent of all cognize galaxies are active, and they can be divided into 3 coincide classes: radio receiver galaxies, se yfert galaxies, and quasars. Radio! galaxies: They emit large amounts of energy in the radio part of the spectrum. They are generally rounded galaxies, and their radio emission differs in two important ways from that of ordinary galaxies: 1) It does not come from much of the main body of the galaxy but from the core and from regions outside the galaxy on either side of it ( formula 16.19) as you can see here, This figure was made by aiming a radio telescope at the galaxy and save those places where the signal was strong....If you want to get a full essay, army it on our website: BestEssayCheap.com

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