AST222H1 Lecture Notes - Lecture 28: Velocity Dispersion, Accretion Disk, Blueshift

• School: UTSG
• Department: Astronomy and Astrophysics
• Course: AST222H1
• Professor: Jo Bovy

Document Summary

Relativity effects are significant because the material in accretion disk is moving nearly the speed of light. Emission saturated in narrow cone (so source looks brighter) with angle t: sin(t) = 1/ . Results in causing a fainter jet moving farther from us & brighter for the jet moving closer to us. Galaxies without quasars may still have black holes. See rotation in centre of galaxy & see if this rotation shows there may be a massive object. Use rotation curve, jump in distribution of velocity. See blue shift & red shift in this diagram. Closer you go to the centre, velocity increases. Go further, velocity decreases, these qualities show it is rotating. From observed increase can conclude there to be a huge thing in the centre, and it has to be a black hole because there is no observed light. Can observe central density peaks in nearby galaxies. Can analyze gas and star velocity of dispersion.