Seyfert galaxies____.
A) often have unique shapes spectra suggesting fast-moving, hot gas
B) have no gas and dust in their spiral arms
C) are associated with pairs of radio sources
D) have visible jets of matter coming from their cores
E) are always isolated galaxies
Correct Answer:
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Q17: Most supermassive black holes are dormant.
Q18: Collisions in the early Universe were rare.
Q19: The broad emission lines of Seyfert galaxies
Q20: Quasars are caused by galaxy collisions in
Q21: Quasars have a(n) _.
A) extremely high blueshift
B)
Q23: The energy output of a Seyfert galaxy_.
A)
Q24: Seyfert galaxies are always _ galaxies.
A) dwarf
B)
Q25: The high luminosity of a Seyfert galaxy_.
A)
Q26: Gas falling into a black hole becomes
Q27: When they were first discovered, quasars appeared
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