Quasar True Colors
the post headline:
Astronomers reveal true colors of evolving galactic beasts
Quasars are powered by the energy from supermassive black holes at their centers as they feed on surrounding gases.
Here is a study of quasars by BeppoSAX concluding the quasar AGN is a source of synchrotron radiation not thermal radiation.
A follow up to the last comment, with the link to the study.
synchrotron radiation X-rays are used in a hospital, with a strong electric current in a strong magnetic field. This is not thermal radiation.
A very hot accretion disk generating X-rays must be via thermal radiation.
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