The oldest radio galaxy yet discovered is hidden in a cluster.
Radio lobes can affect the intergalactic medium, the tenuous gas between, because they can extend millions of light-years, much further than the galaxies from which they erupt.
These jets punch through the interstellar medium and grow into lobes that interact with it. The lobes act as a synchrotron, accelerating electrons and emitting radio waves.The issue is that they very quickly vanish past our capacity to detect them, making it difficult to locate examples older than 200 million years from our perspective. Such "relics," on the other hand, can record valuable information about the conditions under which they formed, noted the researchers.
To date, astronomers have discovered only a few dozen examples of galaxies linked by two pairs of radio lobes, known as double-double radio galaxies.
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