Figure-Based Questions
Figure-Based Questions

 1 Use Figure 24.3 to find the redshift of a galaxy at a distance of 3000 Mpc. 2 Use Figure 24.3 to find the distance of a galaxy that has a redshift of 1.0. 3 Use Figure 24.4 to find the ratio of lookback time to the age of the universe for a galaxy with a redshift of 1.0. 4 Use Figure 24.4 to find the redshift of a galaxy that has a ratio of lookback time to the age of the universe of 0.6. 5 Use Figure 24.8 to find the rate (in milliarcseconds per year) at which components D and C2 of the quasar 3C 345 appear to be moving apart. How long would it take for them to reach a separation of 0.1 second of arc? 6 Use Figure 24.10 to find the apparent speed of a component of a quasar that is moving at 90% of the speed of light in a direction that makes an angle of 20° to the line of sight to the quasar. 7 Suppose two components of a quasar seem to be separating at four times the speed of light but that the real speed with which they are moving apart is 98% of the speed of light. Use Figure 24.10 to find the angle that the motion of one of the components of the quasar makes to the line of sight to the quasar. (There are two answers to this question.) 8 If the general picture of active galaxies presented in Figure 24.23 is correct, what would we call a lowluminosity active galaxy that we see at a large viewing angle? 9 If the general picture of active galaxies presented in Figure 24.23 is correct, what would we call an intermediate-luminosity active galaxy that we see at a small viewing angle? 10 Use Figure 24.26 to find the value of V/Vmax for which the greatest number of quasars are found. 11 Use Figure 24.27 to find the ratio of the space densities of old quasars and more recent quasars for an absolute magnitude of -24.