Author Question: Which of the following is true of Seyfert galaxies? A) They have inactive nuclei. B) They ... (Read 10 times)

madam-professor · **on:** Jul 27, 2018

Which of the following is true of Seyfert galaxies?

A) They have inactive nuclei.
B) They mostly contain dying stars.
C) The spectra of their nuclei contain broad emission lines of highly ionized atoms.
D) The velocities of gas clouds at their centers are much less than velocities at the center of normal galaxies.

Question 2

The major observational difference between a Seyfert galaxy and a normal spiral galaxy is that, unlike a normal spiral galaxy, a Seyfert galaxy:

A) usually has shorter spiral arms.
B) does not have a black hole at its center.
C) has a small, highly luminous nucleus in its bulge.
D) does not contain young stars in its spiral arms.