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Disk is 100000 ly across an d 1000 3000 ly thick

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Unformatted text preview: 00 km/s, taking 230 Myr to go aroun d. disk is 100,000 ly across an d 1000 -3000 ly thick central bulge is more spherical spherical halo of stars on polar/radial orbits (calle d “high-velocity Stars, Galaxies and the Universe Stars move! Maruša Bradač Stars, Galaxies and the Universe Maruša Bradač Stars, Galaxies and the Universe Maruša Bradač Orbits − Note spherical halo of stars on polar/radial orbits Stars, Galaxies and the Universe Maruša Bradač Stars, Galaxies and the Universe Maruša Bradač Mass of Milky Way How do we measure mass? Result: 1011 solar masses inside solar orbit! Apply this to stars at various galactocentric distances to see mass distribution. Result: mass is spread w idely, not just concentrate d in center. But light is more concentrate d in center. This is a clue to what? Stars, Galaxies and the Universe Maruša Bradač For mation Scenario halo stars are ver y metal-po or: 0.02% vs up to 2% for disk stars must have been the first to for m for me d before gas collapse d onto disk ongo ing star for mation in disk (highest metallicity) but...
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This note was uploaded on 02/19/2014 for the course AST 10G taught by Professor Lloydknox during the Spring '09 term at UC Davis.

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