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Odd Radio Circles and their Environment

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arxiv 2111.01269 v1 pith:736LHUZC submitted 2021-11-01 astro-ph.GA

classification astro-ph.GA
keywords radiocirclesenvironmentorcsclosecompaniondiameteremission
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Odd Radio Circles (ORCs) are unexpected faint circles of diffuse radio emission discovered in recent wide deep radio surveys. They are typically about one arcmin in diameter, and may be spherical shells of synchrotron emission about a million light years in diameter, surrounding galaxies at a redshift of ~0.2-0.6. Here we study the properties and environment of the known ORCs. All three known single ORCs either lie in a significant overdensity or have a close companion. If the ORC is caused by an event in the host galaxy, then the fact that they tend to be in an overdensity, or have a close companion, may indicate that the environment is important in creating the ORC phenomenon, possibly because of an increased ambient density or magnetic field.

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Cited by 1 Pith paper

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    astro-ph.GA 2025-09 conditional novelty 6.0 of 10

    Time-dependent injection from bursty star formation or episodic black hole accretion substantially modifies cosmic ray pressure profiles in massive galaxy halos, flattening them at large radii relative to steady-state...

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