Discovery of the Most Powerful Odd Radio Circle: RAD J131346.9+500320

Astronomers have identified the most distant and powerful odd radio circle (ORC) to date, designated RAD J131346.9+500320. This remarkable cosmic structure, located approximately seven billion light-years away, dates back to a time when the universe was only half its current age. Unlike previous ORCs, which typically exhibit a single ring, RAD J131346.9+500320 features two overlapping rings, resembling a cosmic Venn diagram. Each ring spans about 300,000 light-years, with the entire structure extending roughly one million light-years, making it ten times larger than the Milky Way galaxy.

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The discovery was made possible through the collaborative efforts of the RAD@home Astronomy Collaboratory, which utilizes citizen scientists to analyze vast amounts of radio data from the Low-Frequency Array (LOFAR), the world's largest low-frequency telescope. The findings suggest that the rings may be remnants of ancient cosmic events, possibly linked to powerful winds from the galaxy's center, potentially triggered by a black hole merger or a superwind. Dr. Ananda Hota, founder of RAD@home, emphasized the significance of this discovery, stating, "ORCs are among the most bizarre and beautiful cosmic structures we've ever seen – and they may hold vital clues about how galaxies and black holes co-evolve."

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In addition to RAD J131346.9+500320, the RAD@home team has identified two other massive radio structures: RAD J122622.6+640622, which spans nearly three million light-years, and RAD J142004.0+621715, measuring 1.4 million light-years. These discoveries indicate that ORCs are not isolated phenomena but part of a broader family of exotic plasma structures shaped by black hole jets and their environments. Dr. Pratik Dabhade from the National Centre for Nuclear Research in Poland noted that these findings highlight the importance of human pattern recognition in scientific discovery, even in an era dominated by machine learning.

Most powerful cosmic radio ring yet found by citizen scientists

The study of ORCs remains in its infancy, with only about a dozen confirmed examples. Upcoming astronomical facilities, such as the Square Kilometre Array (SKA) and optical surveys like the Dark Energy Spectroscopic Instrument (DESI) and the Vera C. Rubin Observatory's Large Synoptic Survey Telescope (LSST), are expected to enhance our understanding of these enigmatic structures. Researchers hope that these advanced tools will help map the origins and evolution of ORCs, shedding light on their formation processes, which may include ancient black hole outbursts or galactic collisions.

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The collaborative nature of this discovery underscores the value of citizen science in modern astronomy. Dr. Hota remarked, "This work shows how professional astronomers and citizen scientists together can push the boundaries of scientific discovery." The RAD@home project, initiated in 2013, trains volunteers to analyze radio and optical survey data, leading to significant contributions to the field.

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• “ORCs are among the most bizarre and beautiful cosmic structures we've ever seen - and they may hold vital clues about how galaxies and black holes co-evolve,” — Dr. Ananda Hota, RAD@home Astronomy Collaboratory

Giant double-ring radio galaxy found halfway across the universe

• “These discoveries show that ORCs and radio rings are not isolated curiosities — they are part of a broader family of exotic plasma structures shaped by black hole jets, winds, and their environments,” — Dr. Pratik Dabhade, National Centre for Nuclear Research

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The ongoing exploration of ORCs promises to deepen our understanding of the universe's complex dynamics and the interplay between galaxies and black holes.

Giant double-ring radio galaxy found halfway across the universe