chap 14 new-v4

chap 14 new-v4 - Active Galaxies Galaxies with extremely...

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Active Galaxies Galaxies with extremely violent energy release in their nuclei. “active galactic nuclei” (= AGN)
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Line Spectra of Galaxies Taking a spectrum of the light from a normal galaxy: The light from the galaxy should be mostly star light, and should thus contain many absorption lines from the individual stellar spectra.
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Seyfert Galaxies NGC 1566 Circinus Galaxy • Very bright cores • Broad Emission line spectra. • Variability: ~ 50 % in ~ month-week Most likely power source: Accretion onto a supermassive black hole (~10 7 –10 8 M sun ) Unusual spiral galaxies: NGC 7742
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The Jets of M87 M87 = Central, giant elliptical galaxy in the Virgo cluster of galaxies Optical and radio observations detect a jet with velocities up to ~ 1/2 c. J e t : ~ 2 . 5 k p c l o n g BL Lac objects a) Similar to Seyferts, but they are elliptical galaxies with active galactic nuclei b) When we are looking right down the jet, we call these objects Blazars .
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Interacting Galaxies Seyfert galaxy NGC 7674
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This note was uploaded on 04/25/2008 for the course PHY 122 taught by Professor Bernstein during the Spring '08 term at SUNY Buffalo.

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chap 14 new-v4 - Active Galaxies Galaxies with extremely...

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