期刊論文
| 學年 | 111 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2023-03-22 |
| 作品名稱 | Stellar associations powering H II regions - I. Defining an evolutionary sequence |
| 作品名稱（其他語言） | |
| 著者 | Pan, Hsi-an |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Monthly Notices of the Royal Astronomical Society 522(2), p.2369-2383 |
| 摘要 | Connecting the gas in H II regions to the underlying source of the ionizing radiation can help us constrain the physical processes of stellar feedback and how H II regions evolve over time. With PHANGS–MUSE, we detect nearly 24 000 H II regions across 19 galaxies and measure the physical properties of the ionized gas (e.g. metallicity, ionization parameter, and density). We use catalogues of multiscale stellar associations from PHANGS–HST to obtain constraints on the age of the ionizing sources. We construct a matched catalogue of 4177 H II regions that are clearly linked to a single ionizing association. A weak anticorrelation is observed between the association ages and the Hα equivalent width EW(Hα) , the Hα/FUV flux ratio, and the ionization parameter, log q. As all three are expected to decrease as the stellar population ages, this could indicate that we observe an evolutionary sequence. This interpretation is further supported by correlations between all three properties. Interpreting these as evolutionary tracers, we find younger nebulae to be more attenuated by dust and closer to giant molecular clouds, in line with recent models of feedback-regulated star formation. We also observe strong correlations with the local metallicity variations and all three proposed age tracers, suggestive of star formation preferentially occurring in locations of locally enhanced metallicity. Overall, EW(Hα) and log q show the most consistent trends and appear to be most reliable tracers for the age of an H II region. |
| 關鍵字 | H II regions;galaxies: ISM;galaxies: star clusters: general |
| 語言 | en |
| ISSN | 1365-2966 |
| 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 | GBR |
| 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/987654321/124575 ) |