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Multiwavelength structural manifestations of fast magnetohydrodynamic density waves in spiral galaxies
Lou, YQ; Walsh, WM; Han, JL; Fan, ZH
2002-03-01
发表期刊ASTROPHYSICAL JOURNAL
卷号567期号:1页码:289-293
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.
关键词Galaxies : Magnetic Fields Galaxies : Individual (Ngc 2997 Galaxies : Spiral Ngc 1097) Galaxies : Structure Ism : Magnetic Fields Mhd
收录类别SCI
语种英语
WOS记录号WOS:000174047700026
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8566
专题射电天文研究部
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
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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.
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