ALMA Telescope Detects Gigantic Molecular Jet from LMC P3 Microquasar
Researchers identified a 26-light-year-long heated gas streak confirming a powerful microquasar jet mechanism.
1Discovery of LMC P3
LMC P3 is a luminous gamma-ray binary located in the Large Magellanic Cloud, discovered in 2016. It consists of a massive O-type star and a compact object orbiting every 10.3 days. As the first such system found outside our galaxy, it remains a primary subject for high-energy astrophysics research.
2The ALMA Observation
Using the Atacama Large Millimeter/Submillimeter Array in Chile, researchers analyzed carbon monoxide emissions near LMC P3. They identified a distinct, straight streak of gas measuring 26 light-years long and three light-years wide. This structure is significantly warmer than the surrounding 15 Kelvin environment, indicating an external heating source.
3Evidence of Jet Activity
The streak's temperature, ranging from 35 to 60 Kelvin, suggests it is being heated by a high-energy jet originating from the compact object. Since no nearby stars could account for this thermal signature, the jet provides a physical mechanism to explain the system's intense gamma-ray emissions observed by telescopes.
4Microquasar Mechanism Explained
A microquasar features a compact object, either a black hole or neutron star, pulling material from a companion star. This matter forms a swirling accretion disk that launches high-speed jets. The discovery of this cold molecular jet strongly supports the theory that LMC P3 functions as a stellar-sized quasar.
5Black Hole Hypothesis
Yasuo Fukui and his team suggest the system's exceptionally high gamma-ray output points toward a black hole rather than a neutron star. Black holes typically drive more powerful jets than neutron stars. This evidence strengthens the case that LMC P3 contains a stellar-mass black hole formed from a supernova.
6Competing Scientific Theories
Before this discovery, two theories dominated: pulsar winds or microquasar jets. The pulsar model relies on a spinning neutron star emitting particles. However, the detection of the large-scale molecular jet provides empirical support for the microquasar model, effectively shifting the scientific consensus toward the accretion disk-driven jet explanation.
7Methodology and Detection
The jet itself remains invisible to current radio, X-ray, and gamma-ray instruments. Researchers instead mapped the 'shock heating' of surrounding gas clouds. This indirect detection method successfully revealed the jet's path, proving that carbon monoxide mapping is a viable strategy for locating hidden microquasars in dusty galactic regions.
8Broader Astrophysical Implications
LMC P3 is only the second object where such a carbon monoxide streak has been identified, following HESS J1023-575 in the Milky Way. This technique offers a new way to find microquasars in gas-rich environments. Future studies will likely focus on similar streaks to map high-energy jets across the galaxy.