Active Galaxies

Match the items in the drop down on the right to those on the left. Click 'Check' to see your progress.

Active galaxies emitting radio and x-rays. They have very 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.
Bright spectral emission lines caused by either the accretion disc or from highly ionized gas around its nucleus. Gas that rotates the black hole faster shows a broader emission line. Typically they are spiral or irregular galaxies.
Active galaxies that have jets pointing towards Earth. This is the effect of ‘looking down‘ the jet. Each looks different because of the angle at which we view it. Because of this they are quite variable, emitting radio waves and x-rays.