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| 1 | |
What is it about the colors of quasars that makes it easy to distinguish them from most stars and galaxies? |
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| 2 | |
Compare the narrow line and broad line regions of quasars with respect to density and the amounts of material required to produce the emission lines they emit. |
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| 3 | |
What evidence do we have that quasars are a few parsecs or smaller in size? |
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| 4 | |
Suppose a quasar is observed to increase tenfold in brightness in 4 years. Approximately how large can the quasar be? |
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| 5 | |
Describe how we can account for the superluminal motions of quasars without requiring components of quasars that are actually moving apart at speeds greater than the speed of light. |
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| 6 | |
Describe the differences between Seyfert 1 and Seyfert 2 galaxies. |
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| 7 | |
How can viewing angle account for the differences between the two types of Seyfert galaxies? |
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| 8 | |
How do electrons and the energy they carry get into the lobes of radio galaxies? |
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| 9 | |
What is the relationship between jets and the lobes of radio galaxies? |
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| 10 | |
How could a radio galaxy be observed to have two radio-emitting lobes but only a single jet pointing at one of the lobes? |
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| 11 | |
How are blazars similar to quasars, and how are they different? |
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| 12 | |
How can viewing angle account for the differences between quasars and blazars? |
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| 13 | |
How do we know that if black holes power quasars, then those black holes must be very massive? |
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| 14 | |
Explain why, if objects of a particular kind are uniformly distributed through space, we should expect to find about half of them with a V/Vmax less than 0.5 and half with a V/Vmax greater than 0.5. |
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| 15 | |
What is the significance of the observation that the average value of V/Vmax for quasars is greater than 0.5? |
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| 16 | |
How have quasars evolved over the past 10 billion years? |
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| 17 | |
What evidence do we have that there was once a time when there were few, if any, quasars? |
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| 18 | |
What evidence do we have that there may be dead quasars in the centers of normal galaxies today? |
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| 19 | |
Under what circumstances can a gravitational lens produce an Einstein ring rather than multiple images of a distant quasar? |
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