Work

The Evolution of Molecular Clouds: Turbulence-regulated Global Radial Collapse

Year: 2025

Type: article

Abstract: The star formation efficiency (SFE) measures the proportion of molecular gas converted into stars, while the star formation rate (SFR) indicates the rate at which gas is transformed into stars. Here we propose such a model in the framework of a turbulence-regulated global radial collapse in molecular clouds being in quasi-virial equilibrium, where the collapse velocity depends on the density profile and the initial mass-to-radius ratio of molecular clouds, with the collapse velocity accelerating during the collapse process. This simplified analytical model allows us to estimate a lifetime of giant molecular clouds of approximately 0.44−7.36 × 107 yr, and a star formation timescale of approximately 0.5–5.88 × 106 yr. Additionally, we can predict an SFE of approximately 1.59%, and an SFR of roughly 1.85 M ⊙ yr−1 for the Milky Way in agreement with observations.

Source: The Astrophysical Journal

DOI: 10.3847/1538-4357/adb131

Authors: An-Xu Luo, Hong-Li Liu, Jin-Zeng Li

Language: English

Topic: Astrophysics and Star Formation Studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $4,499

Funders: National Natural Science Foundation of China, National Astronomical Observatories, Chinese Academy of Sciences

Awards: G3697657973, G4979776103