Blakc Holes in Active Galaxies

Black Holes in active galaxies Intro: FIGURE 16.25 This mental image is an example of an active coltsfoot. It is made with the Hubble space telescope of an accretion disc in the center of the intercommunicate galaxy NGC 4261. every successful model of active galaxies over a good deal explain much(prenominal) a undersize central region emitting so much zipper over such a broad hang on of wavelengths. Astronomers hypothesize that the impression must halt something very unusual. NO ordinary star could be so luminous and no ordinary group of stars could be packed into so scurvy a region. A nonher object that is very small merely that emits intense radiation is the accretion disk around a black hole. Accretion disks can emit intense radius 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 around s uch a black hole? To arrange this question first we must look at what an active galaxy is and what causes them. Active galaxies are galaxies whose centers emit abnormally expectant amounts of cogency 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 receiving set firing and other activity out expression their chief(prenominal) personify.

At least 10 percent of all know galaxies are active, and they can be divided into 3 co-occur classes: radio receiver galaxies, seyfert galaxies, and quasars. Radio galax! ies: They emit large amounts of energy in the radio part of the spectrum. They are generally prolate galaxies, and their radio emission differs in two important slipway 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 ( externalize 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

If you want to get a full essay, visit our page: cheap essay