Lecture 24 - Galaxies and the Structure of the Universe

Lecture 24 - Galaxies and the Structure of the Universe -...

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Unformatted text preview: Galaxies and the Structure of the Universe ASTRONOMY 3 Lesson 24 1 See http://hubblesite.org/newscenter/archive/releases/2003/01/ for the Press Release on the Hubble Space Telescope observations of the galaxy cluster Abell 1689. The faint arclets are images of distant galaxies gravitationally lensed by the massive cluster. NATURE of the Universe Review of Lesson 23 Astronomy - Galaxies & Structure of the Universe Galaxies can be subdivided into elliptical, spiral and irregular galaxies. The Milky Way is part of the Local Group of galaxies, a small, gravitationally bound cluster of about 45 galaxies. Hubbles law shows that galaxies beyond the local group move away from us with speeds proportional to their distance. Active galaxies are among the most luminous objects in the universe. They have a supermassive black hole in their center fueled by a massive accretion disk. Review: Normal & Active Galaxies NATURE of the Universe Review of Lesson 23 Astronomy - Galaxies & Structure of the Universe Galaxies can be subdivided into elliptical, spiral and irregular galaxies. The Milky Way is part of the Local Group of galaxies, a small, gravitationally bound cluster of about 45 galaxies. Hubbles law shows that galaxies beyond the local group move away from us with speeds proportional to their distance. Active galaxies are among the most luminous objects in the universe. They have a supermassive black hole in their center fueled by a massive accretion disk. Review: Normal & Active Galaxies 2 NATURE of the Universe Questions from Lesson 23 Astronomy - Galaxies & Structure of the Universe Think about (questions from Lesson 23): What happens when galaxies collide? Is the distribution of galaxies in the universe smooth or lumpy? 3 Dark Matter in the Universe (Ch. 16.1) Galaxy Formation & Evolution (Ch. 16.2, 16.3) Structure of the Universe (Ch. 16.5, 17.1) Summary, Homework & Announcements NATURE of the Universe Todays Topics Astronomy - Galaxies & Structure of the Universe Todays Topics: 4 NATURE of the Universe Dark Matter Astronomy - Galaxies & Structure of the Universe observed rotation curve expected rotation curve from the visual matter (stars, gas clouds) 15 30 45 60 75 90 105 (in 1,000 light years) The fat rotation curve oF the Milky Way way beyond the visual disk indicates the presence oF dark matter. At least 2/3 oF the mass oF the Milky Way seems to be dark matter. 5 NATURE of the Universe Dark Matter Astronomy - Galaxies & Structure of the Universe Flat rotation curves indicating the presence of dark matter have also been observed in other spiral galaxies....
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Lecture 24 - Galaxies and the Structure of the Universe -...

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