Multiwavelength structural manifestations of fast magnetohydrodynamic density waves in spiral galaxies
文献类型：期刊论文
| 作者 | Lou, YQ; Walsh, WM; Han, JL ; Fan, ZH
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2002-03-01 |
| 卷号 | 567期号:1页码:289-293 |
| 关键词 | galaxies : individual (NGC 2997, NGC 1097) galaxies : magnetic fields galaxies : spiral galaxies : structure ISM : magnetic fields MHD |
| 英文摘要 | In a spiral galaxy, disks of stars and of magnetized interstellar medium (ISM) are dynamically coupled by gravity. The theory of magnetohydrodynamic (MHD) density waves in such a composite rotating disk system provides a basic framework for studying large-scale dynamics and multiwavelength diagnostics of galactic structures. As swirllike, trailing spiral structures with broad, fuzzy arms (regular or irregular) manifest in neutral hydrogen H I disks that are usually larger than optical spiral patterns in disk galaxies, spiral MHD density waves in H I gas disks should persist within and beyond optical patterns. Sporadic diffusions of relativistic cosmic-ray electrons beyond optical patterns may cause radio continuum arms to occasionally extend across optical spiral patterns and correlate with H I spiral arms at larger radii. We here report the first H I observations of the southern spiral galaxy NGC 2997 to support the fast MHD density wave (FMDW) scenario and to confirm the prior prediction that the isolated, polarized radio continuum arm discovered in the southeast quadrant is indeed associated with a broad segment of the H I arm. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000174047700026 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8566]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.CAS PKU, Beijing Astrophys Ctr, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lou, YQ,Walsh, WM,Han, JL,et al. Multiwavelength structural manifestations of fast magnetohydrodynamic density waves in spiral galaxies[J]. ASTROPHYSICAL JOURNAL,2002,567(1):289-293. |
| APA | Lou, YQ,Walsh, WM,Han, JL,&Fan, ZH.(2002).Multiwavelength structural manifestations of fast magnetohydrodynamic density waves in spiral galaxies.ASTROPHYSICAL JOURNAL,567(1),289-293. |
| MLA | Lou, YQ,et al."Multiwavelength structural manifestations of fast magnetohydrodynamic density waves in spiral galaxies".ASTROPHYSICAL JOURNAL 567.1(2002):289-293. |
入库方式： OAI收割
来源：国家天文台
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