ALMA unveils 800+ hidden seeds of stars nestled within massive cosmic clouds

Using the advanced capabilities of the Atacama Large Millimeter/submillimeter Array (ALMA), an international research team has uncovered more than 800 "stellar seeds" nestled within massive cosmic clouds, offering invaluable insights into the enigmatic process that forms the building blocks of life.

This historic discovery brings the scientific community a significant step closer to unravelling the mysterious birth of high-mass stars.

Led by Kaho Morii, Patricio Sanhueza, and Fumitaka Nakamura, the team peered into 39 enormous cosmic clouds called Infrared Dark Clouds (IRDCs), widely believed to be the cradles of high-mass stars. over 800 molecular cloud cores, colloquially referred to as "stellar seeds," were discovered within these clouds, thanks to ALMA's state-of-the-art sensitivity and resolution.

This represents the most extensive collection of such seeds ever discovered. Astonishingly, an overwhelming 99% of these seeds lacked the expected mass required for growing into high-mass stars, suggesting that high-mass stars follow a different growth trajectory than that of smaller stars. Intriguingly, the study also revealed that core density, rather than mass, might be the critical factor driving high-mass star formation.

The instrumental role played by ALMA in this historic discovery brings the scientific community a significant step closer to unravelling the mysterious birth of high-mass stars. By uncovering these "stellar seeds" within massive cosmic clouds, scientists are gradually piecing together the puzzle of element creation and the remarkable intricacies of the universe.

"The extensive catalog of stellar seeds generated through this study serves as a vital cornerstone for enhancing our comprehension of high-mass star formation and refining existing models in this field," said Patricio Sanhueza of the National Astronomical Observatory of Japan and part of the ALMA project.

"We have shown with more certainty than previous studies that high-mass stars have a different growth scenario from low-mass stars. Also, we can infer that denser cores in clusters may grow up more efficiently by accumulating surrounding materials," said Kaho Morii, a graduate student at the University of Tokyo.

For the unversed, ALMA is a partnership of the European Organization for Astronomical Research in the Southern Hemisphere (ESO), the U.S. National Science Foundation (NSF) and the National Institutes of Natural Sciences (NINS) of Japan in cooperation with the Republic of Chile.