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Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
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A probable Keplerian disk feeding an optically revealed massive young star
Anna F McLeod1,2, Pamela D Klaassen3, Megan Reiter4
1Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham, UK. anna.mcleod@durham.ac.uk.
Nature
|November 29, 2023
Summary
Astronomers discovered an extragalactic massive young stellar object (MYSO) with a rotating disk, challenging formation models. This optically revealed MYSO in the Large Magellanic Cloud suggests low-metallicity environments influence massive star evolution.
Area of Science:
- Astronomy and Astrophysics
- Star Formation
- Extragalactic Astronomy
Background:
- Massive young stellar objects (MYSOs) typically form via disk-mediated accretion, with Keplerian disks and jets observed in our Milky Way.
- Previously, all known MYSO systems were found embedded within their natal material in the Milky Way.
- The formation and evolution of massive stars, especially in extragalactic environments, remain areas of active research.
Purpose of the Study:
- To investigate the presence and characteristics of rotating gaseous structures around extragalactic MYSOs.
- To compare the formation environment and accretion processes of extragalactic MYSOs with those in the Milky Way.
- To provide observational constraints for theoretical models of massive star formation and evolution.
Main Methods:
- Detection of a rotating gaseous structure around an extragalactic MYSO in the Large Magellanic Cloud.
- Analysis of gas motion to infer radial inflow and Keplerian rotation within a central disk-like structure.
- Comparison of the observed extragalactic MYSO system with known Milky Way MYSOs.
Main Results:
- A rotating gaseous structure, indicative of a Keplerian disk, was detected around an extragalactic MYSO.
- The system shows evidence of material inflow from larger scales onto the central accretion disk, similar to Milky Way MYSOs.
- The extragalactic MYSO is optically revealed, unlike its deeply embedded Galactic counterparts, suggesting environmental influences.
Conclusions:
- The findings demonstrate that massive star formation with Keplerian accretion disks occurs in extragalactic environments.
- The optical visibility of this MYSO suggests that low-metallicity and low-dust environments may lead to different formation pathways or observational characteristics.
- These results challenge the universality of the embedded nature of MYSOs and offer crucial insights into massive star evolution.
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