Astronomers using the MeerKAT radio telescope in South Africa have detected the most distant hydroxyl megamaser ever observed, according to a study published in the Astrophysical Journal Letters. The megamaser, a natural laser emitting intense radio waves from hydroxyl molecules, is located in a galaxy more than 5 billion light-years away.
The discovery was made as part of the MeerKAT Absorption Line Survey (MALS), which aims to study gas in distant galaxies. The signal, designated MALS J2241+0021, was identified at a redshift of 0.58, corresponding to a time when the universe was about 60% of its current age.
Hydroxyl megamasers are rare cosmic phenomena that occur when hydroxyl molecules in interstellar gas clouds are stimulated to emit coherent radio waves, similar to how a laser produces light. This particular megamaser is the most distant of its kind known, providing a new tool to study galaxy mergers and star formation in the early universe.
The MeerKAT telescope, located in the Karoo region of South Africa, is a precursor to the Square Kilometre Array (SKA) and has been instrumental in several major discoveries. The finding demonstrates the telescope's sensitivity and its ability to probe the distant universe.
Researchers plan to conduct follow-up observations with other telescopes to study the host galaxy in more detail. The discovery opens a new window into understanding the conditions of galaxies billions of years ago.
