Two-dimensional magnetohydrodynamics simulations of young Type Ia supernova remnants
Fang, Jun1,2; Zhang, Li1; Fang, J (reprint author), Yunnan Univ, Dept Phys, Kunming, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2012-08
卷号424期号:4页码:2811-2820
DOI10.1111/j.1365-2966.2012.21405.x
收录类别SCI
关键词Instabilities Mhd Ism: Supernova Remnants
摘要Using two-dimensional magnetohydrodynamics (MHD) simulations, we investigate the dynamical properties of Type Ia supernova remnants (SNRs) evolved either in a uniform ambient medium or from an interaction with a dense clump. The initial conditions assume that the expansion of the supernova ejecta is of free inertia with a power-law density distribution in the outer part of the ejecta. To include the effects of the diffusive shock acceleration process and the escape of the accelerated particles from the shock front, we use different adiabatic indices in the simulations to study the dynamical evolution of the Type Ia SNRs. Moreover, we investigate the interactions of a SNR with either a small or a large clump. A double-shock structure with a contact discontinuity is produced as the ejecta flow supersonically in the ambient medium; RayleighTaylor instability is clearly shown as fingers near the contact discontinuity in the contour maps of density, and a high density and a high magnetic field can be triggered because of the instability around the RayleighTaylor fingers. We perform simulations with different adiabatic indices, and the results show that a narrower intershock region is produced with a smaller adiabatic index because a larger compression ratio for the SNR shock is induced. The influence of the RayleighTaylor instability on the morphologies of both the forward and reverse shocks is more significant with a smaller adiabatic index. Finally, the simulations of a SNR interacting with a dense clump show that the morphology of the remnant is greatly twisted after the collision, and a filament with a high density and a high magnetic field can be produced as a SNR colliding with a large dense clump.
项目资助者National Natural Science Foundation of China(NSFC,11103016,11173020) ; 973 Programme(2009CB824800) ; Yunnan Province(2011FB012) ; Foundation of Yunnan University(21132014,2010YB043) ; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences(OP201101)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000307385100033
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]NONLINEAR SHOCK ACCELERATION ; RAYLEIGH-TAYLOR INSTABILITIES ; PARTICLE-ACCELERATION ; MAGNETIC-FIELD ; SN 1006 ; EMISSION ; TURBULENT ; EVOLUTION ; EJECTA ; WAVES
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被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9429
专题中国科学院天体结构与演化重点实验室
通讯作者Fang, J (reprint author), Yunnan Univ, Dept Phys, Kunming, Peoples R China.
作者单位1.Department of Physics, Yunnan University, Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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Fang, Jun,Zhang, Li,Fang, J . Two-dimensional magnetohydrodynamics simulations of young Type Ia supernova remnants[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,424(4):2811-2820.
APA Fang, Jun,Zhang, Li,&Fang, J .(2012).Two-dimensional magnetohydrodynamics simulations of young Type Ia supernova remnants.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,424(4),2811-2820.
MLA Fang, Jun,et al."Two-dimensional magnetohydrodynamics simulations of young Type Ia supernova remnants".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 424.4(2012):2811-2820.
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