Sections Review

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Vocabulary

Review Questions

1. Compare the luminosity and size of the power source for quasars to that of a normal galaxy.
2. Contrast the shape of the spectrum and the relative power at different wavelength bands (X-ray, ultraviolet, visible, infrared, radio) for the energy coming from quasars (and active galaxies) to that from mormal galaxies (and stars).
3. What produces the huge power output in quasars and active galaxies?
4. What could cause the power generation to ``turn off'' and later turn back on?
5. What determines the type of active galaxy (i.e., Seyfert 1 or 2, radio galaxy, BL Lac, etc.) you will see?
6. What is the broad-line emission region and what must the orientation of the disk and dust ring be to see the broad-line emission region?
7. What are the jets in active galaxies and how are they produced?
8. Why are there many more quasars billions of light years away than nearby? Include in your explanation a contrast of the conditions of the universe billions of years ago to the current conditions.
9. What does the changing number of quasars with increasing distances tell us about the character of the universe?

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last updated: 26 May 2001