Astronomers Discover Potentially Smallest Odd Radio Circle
Astronomers may have discovered the tiniest odd radio circle

Image: Phys.org
Astronomers have identified a new candidate for an Odd Radio Circle (ORC), named J1248+4826, which is the smallest known ORC at approximately 30,000 parsecs across. This discovery, made using data from the LOFAR Two Meter Sky Survey, challenges existing notions about the size and frequency of ORCs, suggesting smaller versions may be more common than previously thought.
- 01J1248+4826 has a radius of about 9 arcseconds, significantly smaller than previous ORCs, which range from 44 to 365 kiloparsecs.
- 02The surrounding diffuse envelope of J1248+4826 extends to roughly 100 kiloparsecs, aligning more with other known ORCs.
- 03Unlike typical ORCs, J1248+4826's host galaxy is located at the edge of the ring rather than at its center.
- 04The researchers propose that the ring may be formed from old radio plasma re-energized by interactions within a galaxy group.
- 05Further research is needed to confirm J1248+4826's classification and understand its formation, including spatially resolved spectral maps and polarization measurements.
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Astronomers have potentially discovered the smallest known Odd Radio Circle (ORC), designated J1248+4826, which measures about 30,000 parsecs across. This compact ORC was identified during the LOFAR Two Meter Sky Survey and exhibits a unique ring structure with a radius of 9 arcseconds, much smaller than previously reported ORCs that typically range from 44 to 365 kiloparsecs. Unlike other ORCs, where the host galaxy is centered within the ring, J1248+4826's host galaxy is located at the edge of the structure. The researchers, led by M. Polletta from the Italian National Institute for Astrophysics (INAF), suggest that the formation of this ring may involve old radio plasma that was re-energized by dynamic activities within its galaxy group, rather than ongoing activity from an active galactic nucleus (AGN). This discovery could indicate that smaller ORCs are more prevalent than previously believed, but they remain challenging to detect. The team emphasizes the need for further investigation to clarify the origins and properties of J1248+4826 and similar structures, which may provide insights into the lifecycle of radio plasma in galaxy systems.
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