期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 1 |
| 出版（發表）日期 | 2025-12-01 |
| 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) |
| 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 | |
| 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 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/128594 ) |