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October 20, 2025Open Access

Masses, Star-Formation Efficiencies, and Dynamical Evolution of 18,000 HII Regions

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Authors

DPDebosmita PathakALAdam K. LeroyABAshley. T. Barnes

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Overview

Analysis shows star-formation efficiencies of 6-17% in HII regions, indicating complex dynamical evolution.

Key Points

  • Star-formation efficiencies between 6% and 17% demonstrate varying growth rates across HII regions.
  • Larger HII regions in galaxy centers approach dynamical equilibrium, showing distinct pressure profiles.
  • Mass measurements reveal older stars dominate over younger counterparts, affecting star formation dynamics.
  • Most HII regions appear over-pressured relative to their self-gravity, influencing their expansion into surroundings.

Cite This Study

Pathak et al. (2025) studied this question.

synapsesocial.com/papers/68f6196ee0bbbc94fac363e8https://doi.org/10.48550/arxiv.2509.22789
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Also Consider

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  1. 1Physical and chemical characterization of Galactic HII regions2026
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  3. 3Stellar associations powering H2026
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  5. 5Resolved H ii Regions in NGC 253: Ionized Gas Structure and Suggestions of a Universal Density–Surface Brightness Relation2026 · 1 citations