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.
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Astronomers → trace → 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.
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events → accord → universe
The formation, nicknamed the “Treble Clef” because of its distinctive appearance in radio observations, had long presented a challenge to astronomers.
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formation → nickname → 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.
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stars → make → region
By combining observations across multiple wavelengths, researchers were able to piece together a possible explanation for its unusual shape.
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researchers → combine → 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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research → hide → Observatory
The observations revealed a vast reservoir of extremely hot gas surrounding the formation, indicating that it lies within a galaxy cluster.
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it → reveal → cluster
Further analysis showed that the region is not a single, undisturbed cluster but two clusters in the process of merging.
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region → show → merging
Galaxy clusters are among the largest gravitationally bound structures in the universe.
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clusters → bind → universe
They contain hundreds of galaxies, along with immense quantities of hot gas.
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They → contain → gas
When two such systems collide, the resulting disturbances can generate shock waves and alter the physical conditions of the material within them.
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disturbances → collide → them
How a black hole helped shape the Treble Clef
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hole → shape → Clef
The researchers believe the formation developed in two stages, beginning with an outburst from a supermassive black hole near the centre of the galaxy cluster.
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formation → believe → cluster
Such black holes can release enormous amounts of energy, launching jets and driving clouds of charged particles and magnetic fields into their surroundings.
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holes → release → surroundings
In this case, the eruption is thought to have produced bright radio emissions as the particles moved through space at speeds approaching that of light.
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particles → think → light
Over time, the particles lost energy and the radio emission weakened.
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emission → lose → energy
The subsequent collision between the two galaxy clusters may then have compressed the cloud or re-energised its particles, causing it to shine more brightly in radio wavelengths once again.
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it → compress → wavelengths
Shock waves generated by the collision could also have contributed to this revival.
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waves → generate → revival
The process helps explain why the radio structure has such a striking appearance despite the considerable time that may have passed since the black hole’s initial outburst.
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that → help → outburst
X-ray observations reveal evidence of a collision
To investigate the merger, the team examined the distribution of hot gas using X-ray observations from Chandra.
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team → reveal → Chandra
The gas appeared broadly oval-shaped, but subtle variations in its distribution offered clues about the collision.
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variations → appear → collision
The researchers used an image-processing technique to remove the cluster’s symmetrical oval profile, making deviations from that shape easier to identify.
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deviations → use → shape
The resulting image showed stronger X-ray emission on either side of the cluster’s centre, suggesting that the collision occurred along a roughly left-to-right direction from the perspective of the image.
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collision → result → image
The scientists estimate that the direct collision took place a few hundred million years ago, with the two clusters now moving away from one another.
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clusters → estimate → one
The X-ray evidence supports the idea that the merger disturbed the surrounding gas and helped revive the radio-emitting particles responsible for the Treble Clef.
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merger → support → Clef
When cosmic structures resemble familiar symbols
The Treble Clef’s resemblance to musical notation is an example of pareidolia, a common perceptual phenomenon in which people recognise familiar patterns in otherwise unrelated shapes.
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people → resemble → shapes
The formation has no physical connection to music; its nickname simply reflects the distinctive outline revealed by radio observations.
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nickname → have → observations
The combined image brings together the different layers of the discovery: X-rays show the hot gas associated with the merging clusters, radio observations reveal the treble-clef-shaped structure, and infrared data provide additional detail about the surrounding field.
By connecting the radio formation to both black hole activity and a galaxy-cluster merger, the findings show how separate cosmic events can combine to produce unusual structures on enormous scales.
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events → combine → scales
They also demonstrate the value of observing the universe in different wavelengths, particularly in regions where foreground material makes conventional observations difficult.
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observations → demonstrate → regions
The Aporia
