Thursday 27 March 2025
Astronomers have made a fascinating discovery in the Corona Australis region of our galaxy, where they’ve found a dense and cold pre-stellar core that’s unlike anything seen before. This remarkable object, dubbed CrA 151, is thought to be the birthplace of a new star, and its unique properties are providing scientists with valuable insights into the early stages of star formation.
Located about 400 light-years from Earth, CrA 151 is one of the densest pre-stellar cores ever detected. It’s incredibly cold, with temperatures ranging from 8 to 12 Kelvin (-265°C to -261°C), and its density is so high that it could potentially collapse into a star in just a few thousand years.
The core was discovered using the Atacama Pathfinder Experiment (APEX) telescope, which observed the emission of molecular lines from the core. These lines are produced when molecules such as ammonia and water vapor absorb and re-emit radiation at specific wavelengths. By analyzing these emissions, scientists can infer the composition and temperature of the core.
The data collected by APEX shows that CrA 151 is unlike any other pre-stellar core observed so far. Its density and temperature are much higher than those found in other cores of similar size, suggesting that it may be in a more advanced stage of star formation.
One of the most intriguing aspects of CrA 151 is its high level of deuterium, a rare isotope of hydrogen. Deuterium is often used as a proxy for measuring the age and chemical composition of molecular clouds, which are vast regions of space where stars form. The high levels of deuterium in CrA 151 suggest that it may be one of the oldest cores in the Corona Australis region.
The discovery of CrA 151 has significant implications for our understanding of star formation. It suggests that pre-stellar cores can evolve rapidly, collapsing into stars within a relatively short period of time. This challenges current models of star formation, which suggest that cores take millions of years to collapse into stars.
Further observations are needed to confirm the properties of CrA 151 and understand its role in the star-forming process. However, the discovery of this remarkable object is already providing scientists with valuable insights into the early stages of star formation, and it’s likely to be an exciting area of research in the coming years.
Cite this article: “Unveiling the Secrets of CrA 151: A Rare Pre-Stellar Core”, The Science Archive, 2025.
Star Formation, Pre-Stellar Core, Corona Australis, Cra 151, Atacama Pathfinder Experiment, Apex Telescope, Molecular Lines, Deuterium, Density, Temperature
