37 213 orbital evidence the spectacular match between

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37 21.3
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Orbital evidence: The spectacular match between model and data for galaxy M106 suggests a black hole of mass 36 million times that of the Sun . 38 21.3
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Energy from a Black Hole Causes AGN Gravitational potential energy of matter falling into black hole turns into kinetic energy. Friction in an accretion disk turns kinetic energy into thermal energy (heat). Heat produces thermal radiation (photons). This process can convert 10 to 40% of E = mc 2 into radiation. 39 21.3
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Black Holes in Galaxies Many nearby galaxies— perhaps all of them—have supermassive black holes at their centers. These black holes seem to be dormant active galactic nuclei. All galaxies may have passed through a quasar- like stage earlier in time. 40 21.3
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Do supermassive black hole regulate galaxy evolution? 41 21.3 Radio galaxy Hercules
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Galaxies and Black Holes The mass of a galaxy's central black hole is closely related to the mass of its bulge. 42 21.3
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Galaxies and Black Holes The development of the central black hole must be related to galaxy evolution. Regulates a galaxy's gas supply. 43 21.3
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Radio galaxies contain active nuclei shooting out vast jets of plasma that emits radio waves coming from electrons that move at near light speed. 44 21.3
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An active galactic nucleus can shoot out blobs of plasma moving at nearly the speed of light. This suggests a profound influence on the hot gas surrounding a galaxy. 45 21.3
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Here the lobes of radio galaxy NGC 1265 are swept back (upward in the image) because of the motion of the galaxy through intergalactic gas. 46 21.3
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How do we learn about protogalactic clouds? A. by looking at emission lines from molecules in the clouds B. by looking at emission lines from atomic hydrogen in the clouds C. by looking at absorption lines in spectra of background quasars D. by looking at thermal emission from the clouds 47
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How do we study gas outside of galaxies? 48 Gas clouds between a quasar and Earth absorb some of the quasar's light. We can learn about protogalactic clouds by studying the absorption lines they produce in quasar spectra. 21.4
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  • Fall '19
  • galaxy evolution

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