Astronomers using NASA’s Chandra X-ray Observatory have identified a supermassive black hole outburst and a subsequent galaxy cluster collision as the cause of a radio wave formation resembling a treble clef, located behind the Milky Way.
A team of researchers has mapped out the mechanics behind an unusual radio wave structure nicknamed the Treble Clef
because of its striking resemblance to the musical symbol. The formation’s discovery stems from data gathered by NASA’s Chandra X-ray Observatory alongside infrared information from the United Kingdom Infrared Telescope and radio data supplied by the LOw Frequency ARray in Europe.
Pinpointing the origin of the radio structure proved exceptionally difficult because it sits almost directly behind the plane of the Milky Way. Gas, dust, and stars from our own galaxy obstruct the view from Earth, requiring specialized telescopes capable of piercing through the intervening material to reveal what lies beyond.
Telescopes Find Merging Galaxy Clusters
By combining observations from Chandra and the German Extended RÖntgen Survey with an Imaging Telescope Array, researchers found diffuse, hot gas at the site of the formation. This discovery confirmed that the object resides within a galaxy cluster. Further analysis revealed that the hosting structure actually consists of two separate galaxy clusters currently in the process of merging.
Galaxy clusters rank among the largest structures in the universe, holding vast reservoirs of superheated gas and hundreds of individual galaxies. To isolate evidence of the collision within the X-ray data, the authors applied a special technique to highlight important features in the Chandra data.
Black Hole Outbursts and Collision Dynamics Drive the Treble Clef Formation
The study concluded that the Treble Clef formed through a distinct sequence of events. First, an earlier outburst from a supermassive black hole situated at the center of the galaxy cluster propelled clouds of charged particles and magnetic fields outward at speeds approaching that of light. This cosmic crescendo generated bright radio waves that eventually faded as the particles lost energy over time.
Next, the physical collision between the two galaxy clusters compressed and reenergized the particle cloud, causing it to brighten again in radio wavelengths.
First, an earlier outburst from a supermassive black hole in the galaxy cluster’s center drove clouds of charged particles and magnetic fields away at close to the speed of light. This led to a type of cosmic crescendo and initially produced bright radio waves that later faded as the particles lost energy.
Andrea Botteon, National Institute for Astrophysics
Researchers Publish Findings on Coincidental Shape
The research paper detailing these findings, led by Andrea Botteon of the National Institute for Astrophysics in Italy, was published in the Astronomy & Astrophysics journal. Investigators estimate that the direct impact between the two clusters took place a few hundred million years ago, and the massive structures are now actively moving away from each other.
Despite the uncanny likeness to a musical note, researchers emphasize that the shape is purely coincidental. The resemblance represents an instance of pareidolia, the common human tendency to perceive familiar patterns or shapes within random visual data, as no scientific link exists between the cosmic radio waves and musical notation.