AST201H1 Lecture Notes - Starburst Galaxy, Elliptical Galaxy, Hubble Deep Field
11 Aug 2013
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AST201H1 Full Course Notes
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B. halo stars formed from gas containing few heavy elements, the elements needed to create terrestrial planets like the earth. In the disk, stars of all ages, many gas clouds. Spheroidal component: bulge and halo, old stars, few gas clodus. Red pattern shows characteristics, connect the brightest stars. Orbits of stars indicate a mass of about 4 million msun. Thought it was just black, but a lot of galaxies. Comes in different shapes and colors, just like stars. Hit head on with a small and compact galaxy. Punched through the center, caused shock that destroyed spirals. Infrared are picking up cooler component made of dust and gas. Galaxies- a lot of stars banded together by gravity. Hubble"s turning fork classification scheme. (not evolution) elongated shape. The cosmic distance ladder (how do we measure the distances to galaxies?) A standard candle is an object whose luminosity we can determine without measuring its distance.
