Tracing Magnetic Fields By the Synergies of Synchrotron Emission Gradients

被引:13
|
作者
Zhang, Jian-Fu [1 ,2 ]
Liu, Qian [3 ]
Lazarian, Alex [2 ]
机构
[1] Xiangtan Univ, Dept Phys, Xiangtan, Hunan 411105, Peoples R China
[2] Univ Wisconsin, Astron Dept, Madison, WI 53711 USA
[3] Anhui Univ Finance & Econ, Sch Languages & Media, Bengbu 233030, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
ISM: general; ISM: magnetic fields; magnetohydrodynamics (MHD); polarization; turbulence; INTERSTELLAR TURBULENCE;
D O I
10.3847/1538-4357/ab4b4a
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
This paper studies how to employ synchrotron emission gradient techniques to reveal the properties of the magnetic field within the interstellar media. Based on data cubes of three-dimensional numerical simulations of magnetohydrodynamic turbulence, we explore spatial gradients of synchrotron emission diagnostics to trace the direction of the magnetic field. According to our simulations, multifarious diagnostics for synchrotron emission can effectively determine the potential direction of projected magnetic fields. Applying the synergies of synchrotron diagnostic gradients to the archive data from the Canadian Galactic Plane Survey, we find that multifarious diagnostic techniques make consistent predictions for the Galactic magnetic field directions. With the high-resolution data presently available from Low Frequency Array for radio astronomy and those in the future from the Square Kilometer Array, the synergies of synchrotron emission gradients are supposed to perform better in tracing the actual direction of interstellar magnetic fields, especially in the low-frequency Faraday rotation regime where the traditional synchrotron polarization measure fails.
引用
收藏
页数:13
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