期刊論文
| 學年 | 115 |
|---|---|
| 學期 | 1 |
| 出版（發表）日期 | 2026-08-24 |
| 作品名稱 | Mid-infrared Colors Vary with Galactic Environment: Contrasting Star-forming Disks, Young Centers, and Quiescent Star-formation Deserts |
| 作品名稱（其他語言） | |
| 著者 | Debosmita Pathak; Karin M. Sandstrom; Adam K. Leroy; Ryan Chown; Daniel A. Dale; Hannah B. Koziol; Mansi Padave; Jessica Sutter; Thomas G. Williams; Dalya Baron; Alberto D. Bolatto; Médéric Boquien; Oleg V. Egorov; Eric Emsellem; Simon C. O. Glover; Ralf S. Klessen; Eva Schinnerer; Todd A. Thompson; Francesco Belfiore; Frank Bigiel; Enrico Congiu; Ivan Gerasimov; Jay González Lobos; Annie Hughes; Laura A. Lopez; Justus Neumann; Elias K. Oakes; Hsi-An Pan; Erik Rosolowsky; Sumit K. Sarbadhicary |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | The Astrophysical Journal 1008(1), p.35 |
| 摘要 | We present 50–100 pc-resolution JWST/MIRI and NIRCam measurements of mid-infrared (mid-IR) color variations in the diffuse interstellar medium (ISM) of 71 nearby star-forming galaxies from the PHANGS-JWST survey. Mid-IR emission traces the dust column density, intensity (U) and hardness of the interstellar radiation field, and the physical state (charge, size) and abundance of polycyclic aromatic hydrocarbons (PAHs). Mid-IR colors that trace PAH band ratios remain fairly constant in the diffuse ISM of star-forming disks. However, they show stark variations in extreme environments: highly star-forming central molecular zones (CMZs) and star formation deserts/quiescent bulges. In CMZs, PAH-to-continuum (3.3/21, 7.7/21, and 11.3/21 μm) and the 10/21 μm continuum colors are 0.2–0.4 dex lower than in normal disks. We attribute this to higher U based on the far-infrared dust colors and the high 21 μm/ΣMol, which we suggest to be a good tracer of U outside star-forming regions. Meanwhile, star formation deserts show low 7.7 μm PAH emission, resulting in low 7.7/21 μm and 7.7/11.3 μm, while all other mid-IR colors remain typical. This suggests the presence of more neutral PAHs in star formation deserts, where low 7.7 μm likely reflects ISM conditions similar to early-type and elliptical galaxies. All environments form part of a continuous trend in 7.7/11.3 μm versus specific star formation rate. |
| 關鍵字 | |
| 語言 | en_US |
| ISSN | 1538-4357 |
| 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/987654321/129839 ) |