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The spatial energy spectrum of magnetic fields in our galaxy
Han, JL; Ferriere, K; Manchester, RN
2004-08-01
发表期刊ASTROPHYSICAL JOURNAL
卷号610期号:2页码:820-826
摘要Interstellar magnetic fields exist over a broad range of spatial scales, extending from large Galactic scales (similar to10 kpc) down to very small dissipative scales (<<1 pc). In this paper, we use a set of 490 pulsars distributed over roughly one-third of the Galactic disk out to a radius R similar or equal to 10 kpc (assuming R-. = 8.5 kpc) and combine their observed rotation and dispersion measures with their estimated distances to derive the spatial energy spectrum of the Galactic interstellar magnetic field over the scale range 0.5-15 kpc. We obtain a nearly flat spectrum, with a one-dimensional power-law index alpha = -0.37 +/- 0.10 for E-B(k) = Ck(alpha) and an rms field strength of approximately 6 muG over the relevant scales. Our study complements the derivation of the magnetic energy spectrum over the scale range 0.03 - 100 pc by Minter & Spangler, showing that the magnetic spectrum becomes flatter at larger scales. This observational result is discussed in the framework of current theoretical and numerical models.
关键词Ism : Magnetic Fields Pulsars : General Turbulence
收录类别SCI
语种英语
WOS记录号WOS:000222828600018
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8412
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.Observ Midi Pyrenees, F-31400 Toulouse, France
3.CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
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Han, JL,Ferriere, K,Manchester, RN. The spatial energy spectrum of magnetic fields in our galaxy[J]. ASTROPHYSICAL JOURNAL,2004,610(2):820-826.
APA Han, JL,Ferriere, K,&Manchester, RN.(2004).The spatial energy spectrum of magnetic fields in our galaxy.ASTROPHYSICAL JOURNAL,610(2),820-826.
MLA Han, JL,et al."The spatial energy spectrum of magnetic fields in our galaxy".ASTROPHYSICAL JOURNAL 610.2(2004):820-826.
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