AST 201 - Cosmology - Hw #6

AST 201 - Cosmology - Hw #6 - Sean Vanderwall Cosmology...

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Sean Vanderwall Cosmology Problem Set 6 November 16, 2006 Problems: 22.2, 22.11, 22.41, 22.42, 22.49. 22.2 – A rotation curve is “a graph that plots rotational (or orbital) velocity against distance from the center for any object or set of objects.” The rotation curve of the Milky Way darts upward very rapidly and proceeds to oscillate back and forth until the oscillations diminish enough to form a slowly climbing line. The line that is represented is the line of best fit through all of the plotted points. The graph shows that most of the mass in our Milky Way galaxy is not contained in the center, but more towards the outskirts, hinting toward a great amount of dark matter. 22.11 – WIMP’s are weakly interacting massive particles . These particles represent “a possible form of dark matter consisting of subatomic particles that are dark because they do not respond to electromagnetic force.” It seems likely that WIMP’s are the particles which make up dark matter, even though we have never found any before, because the
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This note was uploaded on 04/02/2008 for the course ASTR 204 taught by Professor Zabludoff during the Fall '08 term at Arizona.

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AST 201 - Cosmology - Hw #6 - Sean Vanderwall Cosmology...

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