Lecture20

Lecture20 - Previous Lecture Standard Candles Cepheid...

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Unformatted text preview: Previous Lecture Standard Candles Cepheid Period-Luminosity relation Tully-Fisher relation rotation luminosity correlation Supernova Ia light curve shape correction Redshift-Distance relation v = H d Hubble constant: H = 72 3 km/sec/Mpc 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) 1 intermediate size galaxy: M33 ~30 dwarf galaxies MW and M31 approaching each other at ~300 km/sec More dark matter in local group than in individual galaxies: M/L ~ 10 Other similar groups exist in the surrounding several Mpc The Virgo Cluster nearest large cluster of galaxies about 250 large galaxies and >2000 small galaxies about 16 Mpc distant...
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This note was uploaded on 01/31/2012 for the course 750 110 taught by Professor Ericgawaiser during the Fall '10 term at Rutgers.

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Lecture20 - Previous Lecture Standard Candles Cepheid...

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