Galaxies Flashcards
What is a Seyfert Galaxy?
These have bright spectral emission lines caused by either the accretion disc, or from highly ionized gas around the nucleus. Gas that rotates the black hole faster shows a broader emission line. Typically, serfery galaxies are spiral or irregular.
What is a Blazar?
Blazers are active galaxies that have jets pointing towards Earth. This is the effect of ‘looking down’ the jet of a blazer. It is difficult to make comparisons between blazers because of the angle from which we view them. When they are angled at 90 to 35 degrees we see them differently to when they’re angled between 0 and 35 degrees to our line of sight. Because of this they are quite variable, emitting radio waves and x-rays.
What is a Quasar?
Quasars are active galaxies emitting radio and x-rays. They have extremely large black holes at their centre and are moving away from us at extremely fast rates. They are the furthest and oldest objects we know of; some are as far as 11 billion light years away.
