Why Is the Energy Source for Active Nuclei Like Seyferts

question 151

Multiple Choice

Why is the energy source for active nuclei like Seyferts thought to be compact?

• A) The sources appear to be single stars in photos.
• B) The light can vary over short time intervals.
• C) We know the masses of the black holes that lurk there, and can find their radii.
• D) They are all strong radio sources, with assigned frequencies by their sizes.
• E) Their energy appears to be non- stellar synchrotron radiation.