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Space scientists from Montreal and India captured a radio signal from a faraway galaxy. They used gravitational lensing to discover the most distant galaxy, so far. This type of tracing may aid astronomers to better understand the configuration of faraway galaxies.

The researchers published the breakthrough study in Monthly Notices of the Royal Astronomical Society on December 23, 2022. The study was done at McGill University with the direction of Professor Matt Dobbs. 

The signal was reflected from galaxy SDSSJ0826+5630 by the Giant Metrewave Radio Telescope in Pune, India. 

The radio signal used was coming out of atomic hydrogen. And this is the first-time radio signals were detected from such an enormous distance.

Gravitational lensing window to the past

A gravitational lens is defined as the distribution of matter between a distant light source, and an observer. It bends the light from the source traveling toward the observer. The amount of light bending is actually based on Albert Einstein's general theory of relativity.

Essentially gravity warps and magnifies the light to magnify distant galaxies.

The term gravitational lensing was coined by Einstein. And basically, means that closer objects can act as a magnifying glass for distant objects.

McGill Researcher Arnab Chakraborty explains that "A galaxy emits different kinds of radio signals. Until now, it’s only been possible to capture this particular signal from a galaxy nearby, limiting our knowledge to those galaxies closer to Earth." 

He said that the project was able to capture signals from a "record-breaking distance."

"This will also help us understand the composition of galaxies at much greater distances from Earth," Chakraborty said.

The study described how researchers observed galaxy SDSSJ0826+5630’s composition. And what they also discovered this specific galaxy is about twice the mass of the stars visible to us.

The signals detected signal were emitted from the galaxy when the universe was only 4.9 billion years old.

This gave the research group some insight into "secrets of the early universe."

"It’s the equivalent to a look-back in time of 8.8 billion years," Chakraborty said.