Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems
文献类型：期刊论文
| 作者 | McKinney,J.1,6; Armus,L.6; Pope,A.1; Díaz-Santos,T.7,8,9; Charmandaris,V.5,9; Inami,H.2; Song,Y.3; Evans,A. S.3,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-02-01 |
| 卷号 | 908期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxies Starburst galaxies Interstellar medium Galaxy evolution Infrared astronomy Far infrared astronomy Photodissociation regions Star formation |
| DOI | 10.3847/1538-4357/abd6f2 |
| 英文摘要 | Abstract Star formation in galaxies is regulated by heating and cooling in the interstellar medium (ISM). In particular, the processing of molecular gas into stars will depend strongly on the ratio of gas heating to gas cooling in the neutral gas around sites of recent star formation. In this work, we combine mid-infrared (mid-IR) observations of polycyclic aromatic hydrocarbons (PAHs), the dominant heating mechanism of gas in the ISM, with [C ii], [O i], and [Si ii] fine-structure emission, the strongest cooling channels in dense, neutral gas. The ratio of IR cooling line emission to PAH emission measures the photoelectric efficiency, a property of the ISM which dictates how much energy carried by ultraviolet photons gets transferred into the gas. We find that star-forming, IR-luminous galaxies in the Great Observatories All-Sky LIRG Survey with high IR surface densities have low photoelectric efficiencies. These systems also have, on average, higher ratios of radiation field strength to gas densities, and larger average dust grain size distributions. The data support a scenario in which the most compact galaxies have more young star-forming regions per unit area that exhibit less efficient gas heating. These conditions may be more common at high z, and may help explain the higher star formation rates at cosmic noon. We make predictions on how this can be investigated with the James Webb Space Telescope. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-908-2-ABD6F2 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57923]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA 2.Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan 3.Astronomy Department, University of Virginia, 530 McCormick Road, Charlottesville, VA 22904, USA 4.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA 5.Department of Physics, University of Crete, GR-71003, Heraklion, Greece 6.Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Boulevard, Pasadena, CA 91125, USA 7.Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile 8.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, People’s Republic of China 9.Institute of Astrophysics, Foundation for Research and Technology-Hellas, GR-71110, Heraklion, Greece |
| 推荐引用方式 GB/T 7714 | McKinney,J.,Armus,L.,Pope,A.,et al. Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems[J]. The Astrophysical Journal,2021,908(2). |
| APA | McKinney,J..,Armus,L..,Pope,A..,Díaz-Santos,T..,Charmandaris,V..,...&Evans,A. S..(2021).Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems.The Astrophysical Journal,908(2). |
| MLA | McKinney,J.,et al."Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems".The Astrophysical Journal 908.2(2021). |
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来源：国家天文台
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