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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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