期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2026-04-08 |
| 作品名稱 | Stellar associations powering H II regions: II. Escape fraction of ionising photons |
| 作品名稱（其他語言） | |
| 著者 | Fabian Scheuermann; Kathryn Kreckel; Jia Wei Teh; Francesco Belfiore; Brent Groves; Ashley T. Barnes; Médéric Boquien; Mélanie Chevance; Daniel A. Dale; Oleg Egorov; Simon C. O. Glover; Kathryn Grasha; Stephen Hannon; Ralf S. Klessen; Kirsten L. Larson; Janice C. Lee; Fu-Heng Liang; Laura A. Lopez; J. Eduardo Méndez-Delgado; Justus Neumann; Eve Ostriker; Hsi-An Pan; Lise Ramambason; Francesco Santoro; Eva Schinnerer; David A. Thilker; Qiushi Chris Tian; Leonardo Úbeda; Bradley C. Whitmore; Thomas G. Williams |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Astronomy & Astrophysics 708 , p. 14 |
| 摘要 | Newly formed stars profoundly affect their environment by depositing energy and momentum into the surrounding gas. However, only a fraction of the stellar feedback is retained in the cloud, and observational constraints are needed to improve our understanding of this process. In a sample of 19 nearby galaxies, we matched H II regions from PHANGS–MUSE to their ionizing stellar source from PHANGS–HST and measured the percentage of ionizing radiation that leaks into the surrounding diffuse ionised gas (DIG). Based on a catalogue in which each H II region is powered by a single young and massive stellar association, we measure a photon escape fraction of fesc = 82−24+12 %. We obtain comparable results when using different procedures to match the ionised gas to its source. All samples in our study contain a substantial fraction of objects (up to 20%), in which the stellar source is insufficient to produce the H α flux observed from the nebula. Many of these cases are probably related to uncertain age estimates, but we also find numerous regions for which a significant fraction of the ionising photon budget is contributed by stars that reside outside the boundaries of the H II region. This finding motivates the use of an alternative galaxy-wide approach in which we include all H II regions and stellar sources, not just those that show a clear overlap. When we sum the ionisation budget over entire galaxies, we measure slightly lower, but consistent values. |
| 關鍵字 | HII regions; galaxies: ISM; galaxies: star clusters: general; galaxies: star formation |
| 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 | DEU |
| 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/987654321/129222 ) |