Damping of MHD turbulence in a partially ionized medium

被引:0
|
作者
Hu, Yue [1 ,2 ]
Xu, Siyao [3 ]
Arzamasskiy, Lev [3 ]
Stone, James M. [3 ,4 ]
Lazarian, A. [2 ,5 ]
机构
[1] Univ Wisconsin Madison, Dept Phys, Madison, WI 53706 USA
[2] Univ Wisconsin Madison, Dept Astron, Madison, WI 53706 USA
[3] Inst Adv Study, 1 Einstein Dr, Princeton, NJ 08540 USA
[4] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[5] Univ Bernardo OHiggins, Ctr Invest Astron, Gen Gana 1760, Santiago 8370993, Chile
基金
美国国家科学基金会;
关键词
magnetic field; ISM: magnetohydrodynamics; turbulence; ISM: general; COMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE; STAR-FORMATION RATE; AMBIPOLAR DIFFUSION; INTERSTELLAR TURBULENCE; MAGNETIC-FIELDS; DENSITY-FLUCTUATIONS; COSMIC-RAYS; CLOUD CORES; ANISOTROPY; SIMULATIONS;
D O I
10.1093/mnras/stad3493
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The coupling state between ions and neutrals in the interstellar medium plays a key role in the dynamics of magnetohydrodynamic (MHD) turbulence, but is challenging to study numerically. In this work, we investigate the damping of MHD turbulence in a partially ionized medium using 3D two-fluid (ions + neutrals) simulations generated with the athenak code. Specifically, we examine the velocity, density, and magnetic field statistics of the two-fluid MHD turbulence in different regimes of neutral-ion coupling. Our results demonstrate that when ions and neutrals are strongly coupled, the velocity statistics resemble those of single-fluid MHD turbulence. Both the velocity structures and kinetic energy spectra of ions and neutrals are similar, while their density structures can be significantly different. With an excess of small-scale sharp density fluctuations in ions, the density spectrum in ions is shallower than that of neutrals. When ions and neutrals are weakly coupled, the turbulence in ions is more severely damped due to the ion-neutral collisional friction than that in neutrals, resulting in a steep kinetic energy spectrum and density spectrum in ions compared to the Kolmogorov spectrum. We also find that the magnetic energy spectrum basically follows the shape of the kinetic energy spectrum of ions, irrespective of the coupling regime. In addition, we find large density fluctuations in ions and neutrals and thus spatially inhomogeneous ionization fractions. As a result, the neutral-ion decoupling and damping of MHD turbulence take place over a range of length-scales.
引用
收藏
页码:3945 / 3961
页数:17
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