Why Is the Energy Source for Active Nuclei Like Seyferts

question 72

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

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