期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2026-02-03 |
| 作品名稱 | The PHANGS-MUSE/HST-Hα nebulae catalogue: Parsec-scale resolved structure, physical conditions, and stellar associations across nearby galaxies |
| 作品名稱（其他語言） | |
| 著者 | A. T. Barnes; R. Chandar; K. Kreckel; F. Belfiore; D. Pathak; D. Thilker; A. K. Leroy; B. Groves; S. C. O. Glover; R. McClain; A. Amiri; Z. Bazzi; M. Boquien; E. Congiu; D. A. Dale; O. V. Egorov; E. Emsellem; K. Grasha; J. Gonzalez Lobos; K. Henny; H. He; R. Indebetouw; J. C. Lee; J. Li; F.-H. Liang; K. Larson; D. Maschmann; S. E. Meidt; J. Eduardo Méndez-Delgado; J. Neumann; H.-A. Pan; M. Querejeta; E. Rosolowsky; S. K. Sarbadhicary; F. Scheuermann; L. Úbeda; T. G. Williams; T. D. Weinbeck; B. Whitmore; A. Wofford; PHANGS Collaborationn |
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| 著錄名稱、卷期、頁數 | Astronomy & Astrophysics 706(A95) , p. 25 |
| 摘要 | We present the PHANGS-MUSE/HST-Hα nebulae catalogue, comprising 5177 spatially resolved nebulae across 19 nearby star-forming galaxies (D < 20 Mpc), based on high-resolution Hα imaging from HST, homogenised to a fixed (10 pc) physical resolution and sensitivity. Combined with MUSE integral field spectroscopy, this enables robust classification of 4882 H II regions and the separation of planetary nebulae and supernova remnants. We derive electron densities for 2544 H II regions using [S II] diagnostics and adopt direct or representative electron temperatures for consistent physical characterisation. Nebular sizes are measured using circularised radii and intensity-weighted second moments, yielding a median radius of approximately 20 pc and extending down to (sub-)parsec (deconvolved) radii. A structural complexity score is introduced via hierarchical segmentation to trace substructure, highlighting that around a third of the regions are H II complexes containing several individual clusters and bubbles, with an increased fraction of these regions in galactic centres. A luminosity–size relation, calibrated using the resolved HST sample, is applied to 30 790 MUSE nebulae, allowing the recovery of nebular sizes down to ~1 pc and providing statistical completeness beyond the HST detection limit. Comparisons with classical Strömgren radii indicate that observed sizes are systematically larger, corresponding to typical volume filling factors with a median of ϵ ~ 0.22 (10th–90th percentile 0.06–0.78), with larger regions exhibiting progressively lower values. We associate 3349 H II regions with stellar populations from the PHANGS-HST association catalogue, finding median ages of ~3 Myr and typical stellar masses of around 104–105 M⊙, supporting the link between ionised nebular and young stellar populations. We also assess the impact of diffuse ionised gas on emission-line diagnostics and after removing confirmed supernova remnants, find no strong variation in line ratios with nebular resolution, indicating minimal systematic bias in the MUSE catalogue. This dataset establishes a detailed, spatially resolved connection between nebular structure and ionising sources, and provides a benchmark for future studies of feedback, DIG contributions, and star formation regulation in the ISM, especially in combination with matched high-resolution observations. The full catalogue is made publicly available in machine-readable format. |
| 關鍵字 | HII regions; ISM: structure; galaxies: star clusters: general; galaxies: star formation |
| 語言 | zh_TW |
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| 期刊性質 | 國外 |
| 收錄於 | SCI |
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| 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/987654321/129217 ) |