ASTR 103 Lecture Notes - Lecture 20: Hypernova, Seyfert Galaxy, Radio Galaxy

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Quasars look like stars but have huge redshifts. These redshifts show that quasars are several hundred megaparsecs or more from the. 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. Some of quasars" energy is synchrotron radiation produced by high-speed particles traveling in a strong magnetic field. 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 source radio. Relativistic particles are ejected from the nucleus of a radio galaxy along 2 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.

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