ASTR-101 Lecture 21 the Milky Way and Galaxies

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ASTR-101 Lecture 21 The Milky Way and Galaxies Cepheid Variable Stars Provide Distances to Galaxies Planck Views the Cosmic Microwave Background Radiation (CMB) Primary Evidence for Dark Matter Quasars and Their Friends and Relatives: Quasars, Active Galaxies, and Gamma-Ray Bursters Quasars look like stars but have huge redshifts These redshifts show that quasars are several hundred megaparsecs or more from the Earth, according to the Hubble law To be seen at such large distances, quasars must be very luminous, typically about 1000 times brighter than an ordinary galaxy About 10% of all quasars are strong sources of radio emission and are therefore called “radio-loud”; the remaining 90% are “radio-quiet” Quasars are the ultraluminous centers of distant galaxies Seyfert galaxies seem to be nearby, low- luminosity, radio-quiet quasars Seyfert galaxies are spiral galaxies with bright nuclei that are strong sources of radiation Radio galaxies are elliptical galaxies located midway between the lobes of a double radio source Relativistic particles are ejected from the nucleus of a radio galaxy along two oppositely directed beams Seyferts and radio galaxies bridge the gap between normal galaxies and quasars Blazars are bright, starlike objects that can vary rapidly in their luminosity They are probably radio galaxies or quasars seen end-on, with a jet of relativistic particles aimed toward the Earth Quasar luminosity variability Supermassive black holes are the “central engines” that power active galactic nuclei The preponderance of evidence suggests that an active galactic nucleus consists of a supermassive black hole onto which matter accretes As gases spiral in toward the supermassive black hole, some of the gas may be redirected to become two jets of high-speed particles that are aligned perpendicularly to the accretion disk Quasars, blazars, and radio galaxies may be the same kind of object seen from different angles At a steeper angle, the observer sees a quasar If one of the jets is aimed almost directly at the Earth, a blazar is observed.

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Active Galactic Nuclei: a Brief Introduction
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