Study of Ambipolar Diffusion in the Prestellar Core L1544
On July 12, 2023, a team from Kyushu University and the Max Planck Institute for Extraterrestrial Physics achieved a first: they directly observed ambipolar diffusion in the prestellar core L1544. The observations were carried out using the 30-meter radio telescope operated by the Institute for Radio Astronomy in the millimeter range (IRAM). Their findings were published in the journal Astronomy & Astrophysics.
Ambipolar diffusion is a key process that weakens magnetic fields in dense gas clouds, allowing gravity to take over and trigger the formation of a protostar. This discovery offers new insight into how stars like our Sun are born.
Exploring the Prestellar Core
The target of the study was the prestellar core L1544, located in the Taurus molecular cloud. The researchers detected a velocity difference of about 0.05 kilometers per second between ions and neutral molecules. To make this measurement, they used diazenylium-d 1 ions and neutral para-monodeuterated ammonia. The detected ambipolar diffusion weakens the object's magnetic field, leading to gravitational collapse and the birth of a protostar.
The study indicates that stars similar to our Sun form from the collapse of dense, cold clumps of gas and dust, which scientists call prestellar cores. The authors plan to continue examining other objects to more precisely map the drift of matter.
- Blue lines in the illustration represent magnetic field lines that become distorted due to the core's gravitational compression.
- Red and green dots indicate ions and neutral molecular particles.
- Arrows show their movement toward the core's center.
These results could be significant for further understanding the processes occurring in molecular clouds and star formation. Research into ambipolar diffusion opens up new avenues for studying the physical conditions that promote star formation and may help uncover mechanisms influencing the evolution of galaxies throughout the universe.
In addition to the groundbreaking observations made in the prestellar core L1544, recent findings from the Hubble Space Telescope have unveiled the presence of 2,500 young stars in the Large Magellanic Cloud. This discovery not only complements our understanding of star formation processes but also highlights the dynamic environments where these celestial bodies emerge.