Lecture 24

Lecture 24 - Today(Fri in Astro 3 Cell phones on vibrate...

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Today (Fri.) in Today (Fri.) in Astro Astro 3 3 z Cell phones on vibrate… z The Plan: Í Today: Chapter 15 “Normal and Active Galaxies” Í Planetarium/telescope extra credit: can do next Weds. and hand in by Friday.
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From Weds: summary of Chapter 14 Galaxy is stellar and interstellar matter bound by its own gravity Our galaxy is spiral Variable stars are used for distance measurement, through period-luminosity relationship Star formation occurs in disk, but not in halo or bulge Spiral arms may be density waves Galactic rotation curve shows large amounts of undetectable mass at large radii; called dark matter Activity near galactic center suggests presence of a 2-3 million solar-mass black hole
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Units of Chapter 15 Hubble’s Galaxy Classification The Distribution of Galaxies in Space Hubble’s Law Active Galactic Nuclei The Central Engine of an Active Galaxy
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15.1 Hubble’s Galaxy Classification Major types: spiral, elliptical, irregular Milky Way is a spiral galaxy These are subclassified according to the size of their central bulge as Sa, Sb, or Sc
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15.1 Hubble’s Galaxy Classification A particular type of spiral galaxies are the barred spirals :
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15.1 Hubble’s Galaxy Classification Elliptical galaxies have no spiral arms and no disk. They come in many sizes, from giant ellipticals of trillions of stars, down to dwarf ellipticals of less than a million stars. They contain very little cool gas and dust, and show no evidence of ongoing star formation .
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15.1 Hubble’s Galaxy Classification The irregular galaxies have a wide variety of shapes.
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This note was uploaded on 04/16/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 24 - Today(Fri in Astro 3 Cell phones on vibrate...

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