期刊論文
| 學年 | 114 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2026-07-30 |
| 作品名稱 | Uncovering the multi-scale structure of dust distribution in nearby galaxies |
| 作品名稱（其他語言） | |
| 著者 | E. Tanchon; M. Boquien; J. Chastenet; D. A. Dale; O. V. Egorov; R. Indebetouw; R. S. Klessen; S. E. Meidt; D. Pathak; J. Sutter; D. A. Thilker; A. Amiri; A. T. Barnes; F. Bigiel; I. S. Gerasimov; S. C. O. Glover; K. Grasha; K. L. Larson; J. C. Lee; H.-A. Pan; T. G. Williams |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Astronomy & Astrophysics 712(A14), p. 17 |
| 摘要 | Context. High-resolution JWST-MIRI images allow us to resolve the multi-scale nature of the emission in nearby star-forming galaxies in great detail, from compact star-forming regions to large-scale diffuse emission, providing new insights into dust emission, its composition, and the surrounding interstellar medium (ISM). Aims. We aim to understand at which scale the different processes driving dust emission in mid-infrared (7.7−21 μm) wavelengths take place and whether we can disentangle emission from dense regions from the one linked to a more diffuse component. Methods. We use and enhance the Constrained Diffusion Decomposition algorithm (CDD), an alternative to wavelet transform decomposition, to disentangle the emission from compact regions from the emission originating from diffuse sources. This allows us to quantify the mid-IR spectral properties of the ISM at intervals within a continuum of physical scales. Results. We find a transition scale for Polycyclic Aromatic Hydrocarbons (PAH) emission around 300 pc, with a weaker PAH fraction at smaller scales, highlighting the destruction of PAHs in H II regions. We also show variations in the PAH fraction in different morphological environments, with a lower fraction in bright and star-forming environments. By studying and comparing the probability distribution functions (PDFs) of H II regions and of diffuse ISM with the PDFs at different scales, we find a similar separation scale around 200 pc at which we observe a transition from a power-law PDF for dense structures to a log-normal distribution for the diffuse ISM. Conclusions. We infer the destruction of PAHs in nebular environments and the existence of a transition scale between stellar feedback in nebular regions and heating in the diffuse ISM. We also show that the CDD enables future applications to study the physical scales of emission. |
| 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 | 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/987654321/129789 ) |