The unusual structure evolved in two phases, starting when an ancient black hole eruption released jets of charged particles that gradually faded. A collision between two galaxy clusters subsequently generated shock waves that re-energized the dormant particle cloud, restoring its intense radio emission. NASA's Chandra X-ray Observatory detected a hot gas reservoir indicating the clusters collided horizontally and are currently drifting apart. Published in Astronomy & Astrophysics, the discovery showcases the necessity of multi-wavelength observations to see through Milky Way dust and decode complex cosmic histories.
Key points
Shock waves produced by merging galaxy clusters can compress and revive aging, dormant pa…: Shock waves produced by merging galaxy clusters can compress and revive aging, dormant particle clouds launched by black holes.
The recognizable musical shape is an example of pareidolia, where the human brain identif…: The recognizable musical shape is an example of pareidolia, where the human brain identifies familiar symbols within unrelated physical phenomena.
Combining X-ray, radio, and infrared observations allows researchers to reconstruct seque…: Combining X-ray, radio, and infrared observations allows researchers to reconstruct sequential violent events that shape the cosmos over millions of years.
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Astronomers have traced the origins of an unusual cosmic formation resembling a musical treble clef to an ancient black hole eruption and a subsequent collision between two galaxy clusters. According to NASA’s Chandra X-ray Observatory and a study published in Astronomy & Astrophysics, the discovery offers fresh insight into how violent events can reshape enormous structures across the universe. The formation, nicknamed the “Treble Clef” because of its distinctive appearance in radio observations, had long presented a challenge to astronomers. Its location behind the plane of the Milky Way makes it difficult to observe, as foreground stars, gas and dust obscure much of the region. By combining observations across multiple wavelengths, researchers were able to piece together a possible explanation for its unusual shape.
A cosmic formation hidden behind the Milky Way
The research, led by Andrea Botteon of Italy’s National Institute for Astrophysics (INAF), brought together data from NASA’s Chandra X-ray Observatory, the European Space Agency’s eROSITA telescope, the LOw Frequency ARray (LOFAR) radio telescope network and the United Kingdom Infrared Telescope (UKIRT).
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