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most normal spirals (about 100 times more luminous than the Milky Way). Across the spectrum, the tremendous brightness of Seyferts can change over periods of just days to months and Seyfert galaxies like NGC 7742 in Figure 05-03a are suspected of harboring massive black holes at their cores. Figure 05-03b shows the edge-on view of another Seyfert galaxy M106, which conveys an impression that matters are falling into a hole. |
Figure 05-03a Seyfert Galaxy Face-on [view large image] |
Figure 05-03b Seyfert Galaxy Edge-on [view large image] |