A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array
文献类型：期刊论文
| 作者 | Song,Y.11; Linden,S. T.12; Evans,A. S.7,11; Barcos-Mu?oz,L.7; Privon,G. C.7; Yoon,I.7; Murphy,E. J.7; Larson,K. L.8; Díaz-Santos,T.1,9,10; Armus,L.8 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-07-29 |
| 卷号 | 916期号:2 |
| 关键词 | Star-forming regions Luminous infrared galaxies Galaxy structure Radio continuum emission Galaxy nuclei |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ac05c2 |
| 英文摘要 | Abstract Nuclear rings are excellent laboratories for studying intense star formation. We present results from a study of nuclear star-forming rings in five nearby normal galaxies from the Star Formation in Radio Survey (SFRS) and four local LIRGs from the Great Observatories All-sky LIRG Survey at sub-kiloparsec resolutions using Very Large Array high-frequency radio continuum observations. We find that nuclear ring star formation (NRSF) contributes 49%–60% of the total star formation of the LIRGs, compared to 7%–40% for the normal galaxies. We characterize a total of 57 individual star-forming regions in these rings, and find that with measured sizes of 10–200 pc, NRSF regions in the LIRGs have star formation rate (SFR) and ΣSFR up to 1.7 M⊙ yr?1 and 402 M⊙ yr?1 kpc?2, respectively, which are about 10 times higher than in NRSF regions in the normal galaxies with similar sizes, and comparable to lensed high-z star-forming regions. At ～100–300 pc scales, we estimate low contributions (<50%) of thermal free–free emission to total radio continuum emission at 33 GHz in the NRSF regions in the LIRGs, but large variations possibly exist at smaller physical scales. Finally, using archival sub-kiloparsec resolution CO (J = 1–0) data of nuclear rings in the normal galaxies and NGC 7469 (LIRG), we find a large scatter in gas depletion times at similar molecular gas surface densities, which tentatively points to a multimodal star formation relation on sub-kiloparsec scales. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-916-2-AC05C2 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56815]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Song,Y. |
| 作者单位 | 1.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, People’s Republic of China 2.Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan 3.National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA 4.Department of Physics, University of Crete, Heraklion, 71003, Greece 5.Department of Physics and Astronomy, University of California, Irvine, 4129 Frederick Reines Hall, Irvine, CA 92697, USA 6.Department of Physics & Astronomy, Clemson University, 118 Kinard Laboratory, Clemson, SC 29634, USA 7.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA 8.IPAC, Mail Code 314-6, Caltech, 1200 E. California Boulevard, Pasadena, CA 91125, USA 9.Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile 10.Institute of Astrophysics, Foundation for Research and Technology-Hellas, GR-71110, Heraklion, Greece |
| 推荐引用方式 GB/T 7714 | Song,Y.,Linden,S. T.,Evans,A. S.,et al. A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array[J]. The Astrophysical Journal,2021,916(2). |
| APA | Song,Y..,Linden,S. T..,Evans,A. S..,Barcos-Mu?oz,L..,Privon,G. C..,...&Momijian,E..(2021).A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array.The Astrophysical Journal,916(2). |
| MLA | Song,Y.,et al."A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array".The Astrophysical Journal 916.2(2021). |
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来源：国家天文台
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