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- Fri May 29, 2015 12:16 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Nearby Spiral Galaxy NGC 4945 (2015 May 28)
- Replies: 22
- Views: 3544
Re: APOD: Nearby Spiral Galaxy NGC 4945 (2015 May 28)
If I understand correctly, A Seyfert galaxy is distinguished from a "normal" galaxy because its central black hole has actively in-falling matter; or rather densely in-falling matter. Can/do Seyfert galaxies turn on and off depending on fluctuations in the density of the accretion disc? Co...