The radio emission from the jets in a double-radio source is
A) recombination radiation from electrons combining with protons to form neutral hydrogen gas as the gas cools within the jets.
B) 21-cm emission from neutral hydrogen atoms.
C) thermal emission from very hot matter ejected from the accretion disk around the central black hole.
D) synchrotron radiation from relativistic electrons spiraling in magnetic fields.
Correct Answer:
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