3.1 Astro 1 Section 1 Professor Brandt

3.1 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Monday March 1st 1999 Announcements: Lecture notes: Class 22 So far we have talked about our Galaxy and other galaxies out in space. But we have not talked about overall distribution of galaxies in space. Are they just randomly scattered about or is there some organization? larger sale - need megaparsec 1 Mpc = 1x10 6 pc. Tend to be clustered together in collections ranging from a few to thousands. Interesting and raises important questions. How did galaxies get that way? are the galaxy populations of small clusters the same as those of large clusters? What holds galaxy clusters together? Rich galaxy clusters - contain more than 1000 galaxies in volume that is about 3 Mpc in diameter. - mostly contain elliptical galaxies - often have a giant elliptical in center. Examples coma cluster - 1000 galaxies about 100 Mpc away Virgo Cluster - 2500 galaxies - giant elliptical in center = M87 18 Mpc away - gravity holds together - galaxies not stationary.
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