PCS 181 Lecture Notes - Lecture 3: Accretion Disk, Sagittarius A*, Maarten Schmidt
18 Sep 2017
School
Department
Course
Professor
Document Summary
The dominant population in the centre of galaxies are old stars. Recall the cobe satellite which confirmed (1989 launch to detect the temperature of the space) Cobe was later asked to seek very small temperature variations in the cmb. Cobe found tiny temperature deviations of 0. 0003k. Blue higher energy, young pink regions = 2. 728 + 0. 0003k bule regions = 2. 728 - 0. 0003k. Galaxy theorists hypothesize that galaxies condensed ( ) at the interface between warmer and cooler volumes of space. Wmap data (30 times better in terms of resolution compare to cobe) The first stars formed after the big bang were extremely massive hundreds of times the mass of our sun. Any stars that is 8 times mass of the sun die in a supernova explosion they only lived a few million years. During the space expansion, the core of a star collapse, leaving black holes as remnants, these massive black holes attracted gas/dust in to orbit.
