Odd Radio Circles and their Environment
arXiv:2111.01269 · doi:10.3390/galaxies9040083
Abstract
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.
arXiv commentPublished in Special Issue of Galaxies 9(4), 83: "A New Window on the Radio Emission from Galaxies, Galaxy Clusters and Cosmic Web: Current Status and Perspectives", ed. F. Loi & T. Venturi
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- Odd Radio Circles as supernovae remnants in the intragroup medium
- A horseshoe-shaped ring of diffuse emission detected at 1.4 GHz
- Complex morphology and precession indicators of AGN jets in LoTSS DR2
- Cosmological Zoom-In Simulation of Odd Radio Circles as Merger-Driven Shocks in Galaxy Groups
- Effects of Varied Cosmic Ray Feedback from AGN on Massive Galaxy Properties
- MeerKAT discovery of 164 compact radio rings toward the Galactic Plane
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- Circular Mystery: Exploring Diffuse Emission Surrounding a Radio Galaxy with uGMRT and VLA Multiwavelength Observations
- Time-Dependent Cosmic Ray Halos from Bursty Star Formation and Active Galactic Nuclei: Semi-Analytic Formalism and Galaxy Formation Implications
- Deep polarimetry study reveals double ring ORC-like structures