Masses, Star Formation Efficiencies, and Dynamical Evolution of 18,000 H II Regions
學年 114
學期 1
出版（發表）日期 2025-10-24
作品名稱 Masses, Star Formation Efficiencies, and Dynamical Evolution of 18,000 H II Regions
作品名稱（其他語言）
著者 Debosmita Pathak; Adam K. Leroy; Ashley. T. Barnes; Todd A. Thompson; Laura A. Lopez; Karin M. Sandstrom; Jiayi Sun; Simon C. O. Glover; Ralf S. Klessen; Eric W. Koch; Kirsten L. Larson; Janice Lee; Sharon Meidt; Patricia Sanchez-Blazquez; Eva Schinnerer; Zein Bazzi; Francesco Belfiore; Médéric Boquien; Ryan Chown; Dario Colombo; Enrico Congiu; Oleg V. Egorov; Cosima Eibensteiner; Sushma Kurapati; Miguel Querejeta; Daniel A. Dale; Timo Kravtsov; Mansi Padave, D. J. Pisano; Erik Rosolowsky; Sumit K. Sarbadhicary; Thomas G. Williams; Remy Indebetouw; Hsi-An Pan; Leonardo Úbeda; Amirnezam Amiri; Frank Bigiel; Guillermo A. Blanc; and Kathryn Grasha
單位
出版者
著錄名稱、卷期、頁數 The Astrophysical Journal Letters 993(1), L20
摘要 We present measurements of the masses associated with ∼18,​​​​​000 H ii regions across 19 nearby star-forming galaxies by combining data from JWST, Hubble Space Telescope, MUSE, Atacama Large Millimeter/submillimeter Array, Very Large Array, and MeerKAT from the multiwavelength PHANGS survey. We report 10 pc-scale measurements of the mass of young stars, ionized gas, and older disk stars coincident with each H ii region, as well as the initial and current mass of molecular gas, atomic gas, and swept-up shell material, estimated from lower-resolution data. We find that the mass of older stars dominates over young stars at ≳10 pc scales, and ionized gas exceeds the stellar mass in most optically bright H ii regions. Combining our mass measurements for a statistically large sample of H ii regions, we derive 10 pc-scale star formation efficiencies of ≈6%–17% for individual H ii regions. Comparing each region’s self-gravity with the ambient interstellar medium (ISM) pressure and total pressure from presupernova stellar feedback, we show that most optically bright H ii regions are overpressured relative to their own self-gravity and the ambient ISM pressure and that they are hence likely expanding into their surroundings. Larger H ii regions in galaxy centers approach dynamical equilibrium. The self-gravity of regions is expected to dominate over presupernova stellar feedback pressure at ≳130 and 60 pc scales in galaxy disks and centers, respectively, but is always subdominant to the ambient ISM pressure on H ii region scales. Our measurements have direct implications for the dynamical evolution of star-forming regions and the efficiency of stellar feedback in ionizing and clearing cold gas.
關鍵字
語言 en
ISSN 2041-8205
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/128594 )