MeerKAT Telescope Detects Record-Breaking Gigamaser

Using the MeerKAT radio telescope, an international team of astronomers has discovered the most distant hydroxyl gigamaser ever detected, originating from a merging galaxy over 8 billion light-years away. This discovery provides a glimpse into the early universe and demonstrates the capabilities of the MeerKAT instrument.

Unveiling a Cosmic Laser

The newly identified system, designated HATLAS J142935.3-002836, is observed as it existed when the universe was less than half its current age . While often referred to as a “space laser,” the phenomenon is more accurately described as a maser, which amplifies microwave radiation rather than visible light, using a similar principle of stimulated emission.

Hydroxyl Megamasers and Galactic Collisions

This particular emission is a hydroxyl megamaser – an exceptionally bright radio signal produced when hydroxyl molecules collide within gas-rich, merging galaxies. The collision compresses gas, stimulating hydroxyl molecules to amplify radio radiation . However, HATLAS J142935.3-002836 is so powerful it surpasses the classification of a megamaser, earning it the designation of a gigamaser.

The Role of Galaxy Mergers

Researchers believe the immense energy output stems from a dramatic event: the collision of two galaxies. The gravitational interaction compresses vast clouds of gas, triggering intense star formation. The radiation from these newly formed stars stimulates the hydroxyl molecules, amplifying the microwave signal .

Gravitational Lensing and MeerKAT’s Capabilities

The discovery was aided by gravitational lensing, a phenomenon predicted by Albert Einstein, where the gravity of a closer galaxy magnifies the light from a more distant object. This natural magnification amplified the radio waves from the gigamaser as they traveled to Earth . This demonstrates MeerKAT’s ability to detect extremely distant and faint signals from the early universe.

Future Research

“This is just the beginning,” says Dr. Thato Manamela, lead author of the study and a postdoctoral researcher at the University of Pretoria . “We don’t aim for to discover just one such system—we want to find hundreds to thousands of them.” The research team hopes to identify many more such systems to better understand the evolution of galaxies and the conditions in the early universe.