期刊
ASTROPHYSICAL JOURNAL
卷 716, 期 2, 页码 1438-1452出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/716/2/1438
关键词
galaxies: evolution; galaxies: kinematics and dynamics; galaxies: magnetic fields; galaxies: spiral; methods: numerical
资金
- DFG [SPP1177]
- Science and Technology Facilities Council [ST/G00269X/1] Funding Source: researchfish
- STFC [ST/G00269X/1] Funding Source: UKRI
We present self-consistent high-resolution simulations of NGC 4038/4039 ( the Antennae galaxies) including star formation, supernova feedback, and magnetic fields performed with the N-body/smoothed particle hydrodynamic (SPH) code Gadget, in which magnetohydrodynamics are followed with the SPH method. We vary the initial magnetic field in the progenitor disks from 10(-9) to 10(-4) G. At the time of the best match with the central region of the Antennae system, the magnetic field has been amplified by compression and shear flows to an equilibrium field value of approximate to 10 mu G, independent of the initial seed field. These simulations are a proof of the principle that galaxy mergers are efficient drivers for the cosmic evolution of magnetic fields. We present a detailed analysis of the magnetic field structure in the central overlap region. Simulated radio and polarization maps are in good morphological and quantitative agreement with the observations. In particular, the two cores with the highest synchrotron intensity and ridges of regular magnetic fields between the cores and at the root of the southern tidal arm develop naturally in our simulations. This indicates that the simulations are capable of realistically following the evolution of the magnetic fields in a highly nonlinear environment. We also discuss the relevance of the amplification effect for present-day magnetic fields in the context of hierarchical structure formation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据