Hidden galaxy 11 billion light-years away: A ghost particle hit Antarctica, and led scientists to a hidden galaxy 11 billion light-years away
A tiny particle led to a giant discovery
According to an Eco News report, on September 22, 2021, the IceCube Neutrino Observatory, buried deep in Antarctic ice, detected a high-energy neutrino known as IC 210922A.
Neutrinos are often called “ghost particles” because they carry almost no mass, have no electric charge, and rarely interact with matter. Trillions pass through the Earth, even through our bodies, without leaving a trace. This makes them incredibly difficult to detect, but also valuable because they can travel through the universe almost undisturbed.
After IceCube recorded the event, astronomers began searching the same area of the sky for the possible source of the particle.
A hidden galaxy has emerged as the strongest candidate
Initially, researchers could not find an obvious source such as a gamma-ray burst, supernova, or black hole tearing apart a star.
This breakthrough was made possible by MITOS Science Co. It happened with the appearance of LTD’s Yuji Urata. In Taiwan, he and his team used the James Clerk Maxwell Telescope and Submillimeter Array on Maunakea, Hawaii. Their observations detected a distant galaxy known as JCMT0402−0424, nicknamed the “Shadow Blaster,” according to an Eco News report.
Located approximately 11 billion light-years away, the galaxy is densely covered in dust, making it difficult to observe in visible light. However, it shines brightly in infrared and submillimeter wavelengths, allowing astronomers to study it using special telescopes.
Nature extended a helping hand
Gravitational lensing, a natural phenomenon in which a massive galaxy in the foreground bends and magnifies light from a more distant galaxy, also helped scientists, according to the Eco News report.
Follow-up observations with ALMA showed that Shadow Blaster was strongly lensed, creating multiple distorted images. Data from Gemini North helped researchers measure the foreground galaxy responsible for the amplification, allowing them to better understand the distant source.
The observations revealed a compact central region filled with gas and dust, where new stars are forming at an intense rate.
Not the source scientists expected
High-energy neutrinos are often associated with active galaxies powered by supermassive black holes that eject powerful jets.
Shadow Blaster seems to tell a different story. According to the Eco News report, researchers were unable to detect bright X-ray or gamma ray signals typically associated with an active black hole. Instead, the galaxy appears to be driven largely by intense star formation within dense clouds of gas and dust.
Why is rapid star formation important?
When stars form rapidly in a crowded environment, energetic events such as star explosions can accelerate cosmic rays, which are high-speed particles traveling through space.
If these cosmic rays collide repeatedly with dense gas, they can produce high-energy neutrinos.
According to Yuji Urata, Shadow Blaster contains the type of gas-rich environment that models suggest can produce these particles efficiently, making it the strongest candidate source for IC 210922A, according to the Eco News report.
Filling a gap in the cosmic puzzle
IceCube detected a stable background of high-energy neutrinos from across the universe, but scientists struggled to identify their full origins.
The new study suggests that compact, dusty, star-forming galaxies like Shadow Blaster may make up about a fifth of this background.
While this doesn’t explain every high-energy neutrino, it does point researchers to a new class of objects that could play an important role.
Combining different cosmic messengers
The discovery highlights the importance of “multiple messenger” astronomy, which combines information from particles such as neutrinos with observations made using telescopes, researchers say, according to an Eco News report.
While light reveals one part of the universe, particles reveal another part. Together they help scientists investigate distant objects that might otherwise remain hidden.
We still have more work ahead of us
The researchers emphasize that Shadow Blaster remains the most plausible candidate, not definitive proof.
A chance alignment cannot yet be ruled out, and additional neutrino detections will be needed to confirm whether galaxies like this generally produce high-energy neutrinos.
FAQ
What is “Shadow Blaster”?
Shadow Blaster is the nickname of the distant galaxy JCMT0402−0424.
What is a neutrino?
A neutrino is a tiny particle that rarely interacts with matter, which is why it is often called a “ghost particle.”
