13.13: Galaxies
- Page ID
- 244355
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A number of galaxies are believed to have supermassive black holes at their centers. The Milky Way’s supermassive black hole is called Sagittarius A * or SGR A * . These supermassive black holes have been observed in a number of other galaxies; astronomers are trying to determine if this is a consistent characteristic.
These supermassive black holes are hypothesized to be the principal driver of the active galactic nuclei or AGN . An AGN is a compact region located at a galaxy’s center, which has a significantly higher luminosity from one to several ranges of the electromagnetic spectrum.
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