3C 20 is a radio galaxy located in the constellation Cassiopeia. It features a prominent double hotspot in its eastern lobe. An unusually low fraction of the flux lies within the radio core, which is suggested to be caused by a combination of factors, including jet orientation, synchrotron self-absorption and aging, as well as interactions with surrounding gas and dust.
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This article is an automated import of the Wikipedia article "3C 20", available at https://en.wikipedia.org/wiki/3C_20 . Text is licensed under CC BY-SA 4.0.