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More in the next few lectures 33 stars galaxies and

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Unformatted text preview: ons different origins! (more in the next few lectures) 33 Stars, Galaxies and the Universe Maruša Bradač Dust in the Milky Way Can we see the dust? Oh, yeah. 34 Stars, Galaxies and the Universe Gas in the Milky Way The gas is mostly neutral hydrogen Astronomers call this “HI” (“H one”) HI in the Milky Wa35 y Maruša Bradač Stars, Galaxies and the Universe HI in the Milky Wa36 y Maruša Bradač Stars, Galaxies and the Universe Maruša Bradač Stars, gas, an d dust are tightly couple d Stars for m from co ol gas… Evolving stars release gas an d metals, an d heat the surroun ding gas. Gas co ols. See Step 1. 37 Stars, Galaxies and the Universe Maruša Bradač Gas: Stars for m from the gravitational collapse of the densest parts of molecular clou ds. (Forms a disk because initial cloud rotates, and angular momentum is conserved) 38 Stars, Galaxies and the Universe Maruša Bradač Milky Way: Summar y the “pancake” is a disk of stars an d gas on circular orbits, i.e. rotating. ( Why?) we are in the disk, 28,000 light-yrs from the center, orbiting at 2...
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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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