It might sound like a plot twist from a sci-fi novel, but “space lasers” are real. Recently, scientists discovered one of the brightest and farthest examples yet. This phenomenon, called a gigamaser, is shooting out intense radio waves from a galactic collision situated about 8 billion light-years away.
The discovery was made using the MeerKAT radio telescope in South Africa. What’s even more exciting is that gravitational lensing helped amplify the signal. Thato Manamela, an astrophysicist at the University of Pretoria, explains, “We’re seeing the radio equivalent of a laser halfway across the universe. A foreground galaxy is acting like a lens, bending space-time and enhancing the signal as it travels to us.” This unique combination of elements led to an unexpected but thrilling find.
Lasers, originally an acronym for “light amplification by stimulated emission of radiation,” can work in similar ways with microwaves, leading us to masers. Both require a dense environment of excited atoms or molecules and photons that trigger the emission of more photons, amplifying the signal.
Astrophysical masers can form in various settings, such as comets, star-forming regions, or supernova remnants. More intense events like collisions between galaxies produce even brighter emissions called megamasers, and the newest discovery qualifies as a gigamaser, indicating it emits billions of times more energy than standard masers.
This particular instance, designated HATLAS J142935.3–002836, arises from two galaxies merging. The gravitational chaos compresses surrounding gas and ignites new star formation. The newborn stars emit photons that stimulate hydroxyl molecules, producing this incredible gigamaser effect.
The light from this cosmic event has traveled an astounding 7.82 billion light-years, breaking the previous record. This significant distance underscores our ever-deepening understanding of space phenomena, especially with instruments like MeerKAT at the forefront of these discoveries.
These findings could have implications for our grasp of galaxy interactions and the evolution of cosmic structures. Researchers note that exploring such distant phenomena enhances our understanding of galaxy outflows and merging activities, providing critical data for astronomy.
This discovery has been accepted for publication in the journal Monthly Notices of the Royal Astronomical Society Letters and is available as a preprint online.
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