期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2026-02-01 |
| 作品名稱 | Resolved H II Regions in NGC 253: Ionized Gas Structure and Suggestions of a Universal Density─Surface Brightness Relation |
| 作品名稱（其他語言） | |
| 著者 | Rebecca L. McClain; Adam K. Leroy; Enrico Congiu; Ashley. T. Barnes; Francesco Belfiore; Oleg Egorov; Eric Emsellem; Erik Rosolowsky; Amirnezam Amiri; Médéric Boquien; Jérémy Chastenet; Ryan Chown; Daniel A. Dale; Sanskriti Das; Simon C. O. Glover; Kathryn Grasha; Rémy Indebetouw; Eric W. Koch; Smita Mathur; J. Eduardo Méndez-Delgado; Elias K. Oakes; Hsi-An Pan; Karin Sandstrom; Sumit K. Sarbadhicary; Bradley C. Whitmore; Thomas G. Williams |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | The Astrophysical Journal 998(1) , p. 29 |
| 摘要 | We use the full-disk Very Large Telescope/MUSE mosaic of NGC 253 to identify 2492 H II regions and study their resolved structure. With an average physical resolution of 17 pc, this is one of the largest samples of highly resolved spectrally mapped extragalactic H II regions. Regions of all luminosities exhibit a characteristic emission profile described by a double Gaussian with a marginally resolved or unresolved core with radius < 10 pc surrounded by a more extended halo of emission with radius = 20─30 pc. Approximately 80% of the emission of a region originates from the halo component. As a result of this compact structure, the luminosity─radius relations for core and effective radii of H II regions depend sensitively on the adopted methodology. Only the isophotal radius yields a robust relationship in NGC 253, but this measurement has an ambiguous physical meaning. We invert the measured emission profiles to infer density profiles and find central densities of ne ≍ 10─100 cm−3. In the brightest regions, these agree well with densities inferred from the [S II] λλ6716, 6730 doublet. The central density of H II regions correlates well with the surface brightness within the effective radius. We show that this same scaling relation applies to the recent MUSE + Hubble Space Telescope catalog for 19 nearby galaxies. We also discuss potential limitations, including completeness, impacts of background subtraction and spatial resolution, and the generality of our results when applied to other galaxies. |
| 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/987654321/129219 ) |