Spectral Properties of Magnetohydrodynamic Turbulence Revealed by Polarization Synchrotron Emission with Faraday Rotation
Zhang, Jian-Fu1,2; Lazarian, Alex3; Xiang, Fu-Yuan1
发表期刊ASTROPHYSICAL JOURNAL
2018-08-20
卷号863期号:2页码:13
DOI10.3847/1538-4357/aad182
收录类别SCI
关键词Ism: Magnetic Fields Magnetohydrodynamics (Mhd) Radio Continuum: Ism Turbulence
摘要

We investigate how to recover the spectral properties of underlying magnetohydrodynamic (MHD) turbulence using fluctuation statistics of synchrotron polarization radiation, based on the synthetic observations. Taking spatially coincident, separated, and compounded synchrotron emission and Faraday rotation regions into account, we extract the power spectrum of synchrotron polarization intensities integrated along the line of sight. Our results demonstrate that in the short wavelength range, the power spectra reflect fluctuation statistics of the perpendicular component of turbulent magnetic fields, and the spectra at long wavelengths reveal the fluctuation of the Faraday rotation density, which is a product of the parallel component of magnetic field and thermal electron density. We find that our numerical results (in the case of spatially coincident regions) are in agreement with the analytical prediction in Lazarian & Pogosyan, and this theoretical prediction is applicable to more complicated settings, i.e., the spatially separated and compounded regions. We simulate telescopic observations that incorporate the effects of telescope angular resolution and noise, and find that statistics of underlying MHD turbulence can be recovered successfully. We expect that the technique can be applied to a variety of astrophysical environments, with existing synchrotron data cubes and a large number of forthcoming data sets from such as the LOw Frequency Array for Radio astronomy, the Square Kilometer Array, and the Five-hundred-meter Aperture Spherical radio Telescope.

资助项目National Natural Science Foundation of China[11703020] ; National Natural Science Foundation of China[U1531108] ; National Natural Science Foundation of China[U1731106] ; CAS Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201712] ; Hunan Provincial Natural Science Foundation[2018JJ3484] ; NSF[DMS 1622353] ; NSF[AST 1715754]
项目资助者National Natural Science Foundation of China[11703020, U1531108, U1731106] ; CAS Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201712] ; Hunan Provincial Natural Science Foundation[2018JJ3484] ; NSF[DMS 1622353, AST 1715754]
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000442628400033
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Velocity Coordinate Spectrum ; Interstellar Turbulence ; Power Spectrum ; Magnetic-fields ; Mhd Turbulence ; Reconnection ; Statistics ; Density ; Lines ; Reacceleration
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17839
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, Jian-Fu; Lazarian, Alex; Xiang, Fu-Yuan
作者单位1.Department of Physics, Xiangtan University, Xiangtan, Hunan 411105, People's Republic of China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
3.Astronomy Department, University of Wisconsin, Madison, WI 53711, USA
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Zhang, Jian-Fu,Lazarian, Alex,Xiang, Fu-Yuan. Spectral Properties of Magnetohydrodynamic Turbulence Revealed by Polarization Synchrotron Emission with Faraday Rotation[J]. ASTROPHYSICAL JOURNAL,2018,863(2):13.
APA Zhang, Jian-Fu,Lazarian, Alex,&Xiang, Fu-Yuan.(2018).Spectral Properties of Magnetohydrodynamic Turbulence Revealed by Polarization Synchrotron Emission with Faraday Rotation.ASTROPHYSICAL JOURNAL,863(2),13.
MLA Zhang, Jian-Fu,et al."Spectral Properties of Magnetohydrodynamic Turbulence Revealed by Polarization Synchrotron Emission with Faraday Rotation".ASTROPHYSICAL JOURNAL 863.2(2018):13.
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