The location, clustering, and propagation of massive star formation in giant molecular clouds

Abstract

Massive stars are key players in the evolution of galaxies, yet their formation pathway remains unclear. In this work, we use data from several galaxy-wide surveys to build an unbiased dataset of ~700 massive young stellar objects (MYSOs), ~200 giant molecular clouds (GMCs), and ~100 young (<10 Myr) optical stellar clusters (SCs) in the Large Magellanic Cloud. We employ this data to quantitatively study the location and clustering of massive star formation and its relation to the internal structure of GMCs. We reveal that massive stars do not typically form at the highest column densities nor centers of their parent GMCs at the ~6 pc resolution of our observations. Massive star formation clusters over multiple generations and on size scales much smaller than the size of the parent GMC. We find that massive star formation is significantly boosted in clouds near SCs. Yet, whether a cloud is associated with a SC does not depend on either the cloud's mass or global surface density. These results reveal a connection between different generations of massive stars on timescales up to 10 Myr. We compare our work with Galactic studies and discuss our findings in terms of GMC collapse, triggered star formation, and a potential dichotomy between low- and high-mass star formation.

13 pages, 7 figures, in press

References in corpus (12)

• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Structural Analysis of Molecular Clouds: Dendrograms
• The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
• Cooling, Gravity and Geometry: Flow-driven Massive Core Formation
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. I. Dust Properties and Insights into the Origin of the Submm Excess Emission
• The Perils of Clumpfind: The Mass Spectrum of Sub-structures in Molecular Clouds
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. II. Gas-to-Dust Ratio Variations across ISM Phases
• The Luminosity Functions and Timescales of MYSOs and Compact HII regions
• Tidally Triggered Star Formation in Close Pairs of Galaxies: Major and Minor Interactions
• The dangers of being trigger--happy
• Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
• IRAM-30m large scale survey of ${}^{12}$CO(2-1) and ${}^{13}$CO(2-1) emission in the Orion molecular cloud

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• ACA CO(J=2-1) Mapping of the Nearest Spiral Galaxy M33. II. Exploring the Evolution of Giant Molecular Clouds