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A young galaxy would contain clouds or filaments with |T10⁴| K in pressure balance with a medium at |T10⁶| K. When activity in its nucleus turns such a galaxy into a strong radio source, shocks propagate through this two-phase gas, inflating radio lobes filled with relativistic plasma. The shocks expel the hot-phase gas, but leave the clouds within the lobes where they are squeezed by the higher pressure. This compression pushes many clouds over the threshold for gravitational instability, thereby triggering a burst of star formation. This process may account for the recently discovered alignment of optical and radio structure in high-z radio galaxies.
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M. J. Rees (1989) studied this question.
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