Lesson 27 - Lecture 2 - Supermassive Black Holes.pdf - What...

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Introduction to AstronomyWhat Powers an AGN?
Supermassive Black HolesPresented by Robert WagnerThe emit jets of material in a narrow beam at speeds near the speed of lightThis much energy, emitted from such a small region needs an energy sourcemuch more powerful than nuclear fusionQuasars were much more common in the early history of the universe thanthey are todayObservational Evidence for Supermassive BlackHolesImage Credit: By Cmglee [CC BY-SA 3.0() or GFDL ()], fromWikimedia CommonsIndirect evidenceLarge mass in a small volumeShort time period variations in brightnessHow to determine mass?Kepler’s third lawOrbits of stars near the galactic center (Milky Way):Central mass must be 4.1 million MSize is about the diameter of the orbit of NeptuneMotions of gas in M87 (elliptical galaxy)

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