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Newly Discovered Odd Radio Circle Sparks Galaxy Mystery

9/17/2025

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Summary

Story summary

Astronomers from Ruhr University Bochum studied the newly discovered odd radio circle (ORC) J0356–4216 using radio spectropolarimetric techniques.
Identified in October 2023, ORC J0356–4216 has a double-ring structure measuring about two arcminutes across, or 2.18 million light-years.
It emits only radio waves, prompting questions about its origins.
Researchers suggest it may be remnants of past active galactic nucleus (AGN) activity or shock waves from galaxy mergers, with AGN activity being the more consistent explanation.
The findings indicate the elliptical galaxy hosting ORC J0356–4216 likely experienced significant AGN activity in the past, enhancing understanding of galaxy dynamics.

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Story summary

Astronomers from Ruhr University Bochum studied the newly discovered odd radio circle (ORC) J0356–4216 using radio spectropolarimetric techniques.
Identified in October 2023, ORC J0356–4216 has a double-ring structure measuring about two arcminutes across, or 2.18 million light-years.
It emits only radio waves, prompting questions about its origins.
Researchers suggest it may be remnants of past active galactic nucleus (AGN) activity or shock waves from galaxy mergers, with AGN activity being the more consistent explanation.
The findings indicate the elliptical galaxy hosting ORC J0356–4216 likely experienced significant AGN activity in the past, enhancing understanding of galaxy dynamics.