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summary_ch16.pdf

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Department
Astronomy
Course Code
AST201H5
Professor
J B Lester

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AST 201S - Stars and Galaxies University of Toronto Mississauga Chapter 16 Summary Essential Cosmic Evolution, 5 Editionth 1. Definitions • Dark Matter = source of gravity that balances the observed motions but that cannot be detected using any form of radiation • Dark Energy = energy that causes observed motion but cannot be detected using any form of radiation 2. Dark Matter in the Milky Way • Up/down “bobbing” motions of stars near the Sun indicate more matter than we see = dark matter • Orbital speeds in the Milky Way indicate more matter than we see = dark matter 3. Dark Matter in other galaxies • Orbit speeds in spiral galaxies indicate more matter than we see = dark mat- ter • Radial motions in elliptical galaxies indicate more matter than we see = dark matter 4. Dark Matter outside galaxies • Motions of galaxies within clusters indicate more matter than we see = dark matter • Extremely hot x-ray-emitting gas in clusters must be held there by more matter than we see = dark matter • Gravitational lensing by clusters indicate more matter than we see = dark matter 5. Ordinary Dark Matter • Things that we know about that would be hard to see: rocks, plants,
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