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Chapter 15 Cosmology (Galaxies)

Chapter 15 Cosmology (Galaxies) - Galaxies Click to edit...

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Click to edit Master subtitle style Galaxies
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Galaxies A few hundred billion in the observable universe Three types Spiral Elliptical Irregular
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Spiral Galaxies Contain large amounts of gas and dust Thus produce many young stars. Barred, unbarred Similar structure to our own Milky Way
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Elliptical Galaxies Contain little gas and dust Consist mostly of older stars Great range in sizes Dwarf ellipticals, ~10 million stars Giant ellipticals, trillions of stars
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Distances to Galaxies Standard Candles Variable stars Cepheids Type I Supernovae
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The Distance Ladder Radar ranging Parallax Main-sequence fitting Cepheid Variable Stars Type I supernovae
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Galaxy Formation Universe initially fairly uniformly filled with hydrogen and helium. Slight differences in density lead to formation of structure (protogalactic clouds.) What type of structures form from these clouds depends on two factors Initial conditions of the cloud Angular momentum Density Subsequent interactions – collisions!
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Colliding Galaxies
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Formation of Galaxies
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Large-Scale Structure
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Click to edit Master subtitle style Cosmology
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