Magnetic fields in nearby galaxies: Low-frequency radio observations

附近星系的磁场：低频射电观测

• 批准号: 159374082
• 负责人: Dr. Rainer Beck
• 金额: --
• 依托单位: Max-Planck-Institut für Radioastronomie
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/159374082?language=en
• 关键词: Magnetic; fields; nearby; galaxies; Low

The origin of the well organised magnetic fields on galactic scales is a fundamental problem in extragalactic astrophysics. For theoretical models, constraints with regard to the magnetic field strength and orientation on most relevant scales are required, from the smallest scales related to turbulence, to the largest scales related to outflows into the intergalactic environment. Radio continuum observations at low frequencies as provided by LOFAR will allow us to address in particular the latter problem. This Project focuses on investigations of magnetic fields in and around normal spiral galaxies and massive irregular galaxies using low-frequency radio continuum observations with unprecedented angular resolution and sensitivity. At low frequencies the low-energy cosmic-ray electrons trace the magnetic fields to much larger galactic radii, and the analysis of the Faraday rotation is sensitive to much smaller magnetic field strengths than previous methods. Especially, we will analyse the energy gain and loss processes of the relativistic electrons via radio spectral index maps, the strength and structure of magnetic fields in galaxy disks and halos, the bulk speed of the relativistic electrons and their relation to the flow patterns of thermal gas and to the magnetic fields generated by galactic dynamos.

星系尺度上组织良好的磁场的起源是河外天体物理学中的一个基本问题。对于理论模型，需要在最相关的尺度上对磁场强度和方向进行约束，从与湍流相关的最小尺度到与星系际环境流出相关的最大尺度。LOFAR提供的低频无线电连续观测将使我们能够特别解决后一个问题。该项目的重点是利用具有前所未有的角分辨率和灵敏度的低频无线电连续观测，调查正常螺旋星系和大质量不规则星系内部和周围的磁场。在低频率下，低能宇宙射线电子追踪磁场到更大的银河系半径，而对法拉第旋转的分析比以前的方法对小得多的磁场强度敏感。特别是，我们将通过射电谱指数图分析相对论电子的能量增益和损失过程，星系盘和晕中磁场的强度和结构，相对论电子的整体速度及其与热气体流动模式和星系发电机产生的磁场的关系。

项目成果

Modelling the cosmic ray electron propagation in M 51

模拟 M 51 中的宇宙射线电子传播

• DOI: 10.1051/0004-6361/201628446
• 发表时间: 2016
• 期刊: arXiv: Astrophysics of Galaxies
• 作者: Mulcahy;Fletcher
• 通讯作者: Fletcher

THE MAGNETIZED GALACTIC WIND AND SYNCHROTRON HALO OF THE STARBURST DWARF GALAXY IC 10

星爆矮星系 IC 10 的磁化星系风和同步加速器光环

• DOI: 10.3847/0004-637x/819/1/39
• 发表时间: 2016
• 期刊: The Astrophysical Journal
• 作者: Drzazga;Bomans
• 通讯作者: Bomans

Advective and diffusive cosmic ray transport in galactic haloes

星系晕中的平流和扩散宇宙射线传输

• DOI: 10.1093/mnras/stw360
• 发表时间: 2016
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Heesen;Dettmar;Krause
• 通讯作者: Krause

Resolved magnetic structures in the disk-halo interface of NGC 628

NGC 628 盘-晕界面中的磁结构解析

• DOI: 10.1051/0004-6361/201629907
• 发表时间: 2017
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Mulcahy

CHANG-ES. VII. MAGNETIC OUTFLOWS FROM THE VIRGO CLUSTER GALAXY NGC 4388

• DOI: 10.3847/0004-637x/824/1/30
• 发表时间: 2016-04
• 期刊: The Astrophysical Journal
• 作者: A. Damas-Segovia;R. Beck;B. Vollmer;T. Wiegert;M. Krause;J. Irwin;M. Weżgowiec;Jiang-Tao Li;R. Dettmar;J. English;Q. Wang