Lecture21 - Astro Nova Coolest Brown Dwarf ever T = 230 C =...

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Unformatted text preview: Astro Nova Coolest Brown Dwarf ever T = 230 C = 450 F 15 30 M Jupiter 1 5 billion yrs old Mars Reconnaissance Orbiter Phobos picture resolves features 65 feet across Previous Lecture Active galaxies Radio galaxies Seyfert galaxies BL Lac objects Quasars Unified model of AGN QSO absorption lines Final Exam Wednesday May 14 9:00 am 10:30 am Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 22 - 27 Lectures 15-27 (March 13 through May 1) Bring Student ID card and a #2 pencil Practice Exam on class web page soon Quiz Question #1 A spiral galaxy with a bright blue nucleus is a: A. Quasar B. BL Lac object C. Radio galaxy D. Seyfert galaxy E. Blazar Mass to Light Ratio Denoted M/L, usually expressed in solar units Characterizes stellar population Upper main sequence M/L ~ 0.01 Sun M/L = 1 Lower main sequence M/L ~ 10 Measures the amount of dark matter Milky Way M/L ~ 2 Increases with scale of system Galaxy Clusters Just as stars are organized into binaries, other multiples, and star clusters, so too are galaxies grouped into larger structures Binary galaxies gravitational bound pair of galaxies not as common as binary stars Galaxy groups systems of dozens of galaxies sizes up to ~ 1 Mpc diameter speeds of hundreds of km/sec within the group The Local Group 2 major galaxies: Milky Way, Andromeda (M31)...
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Lecture21 - Astro Nova Coolest Brown Dwarf ever T = 230 C =...

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