Measuring Magnetic Fields Near and Far with the SKA via the Zeeman Effect
Timothy Robishaw, James A. Green, Gabriele Surcis, Wouter Vlemmings, A. M. S. Richards, Sandra Etoka, Tyler Bourke, Vincent Fish, Malcolm Gray, Hiroshi Imai, Bu… 展开作者
Timothy Robishaw, James A. Green, Gabriele Surcis, Wouter Vlemmings, A. M. S. Richards, Sandra Etoka, Tyler Bourke, Vincent Fish, Malcolm Gray, Hiroshi Imai, Busaba Kramer, James McBride, Emmanuel Momjian, Anuj Sarma, Albert Zijlstra
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10 pages, 0 figures; to appear as part of 'Cosmic Magnetism' in Proceedings 'Advancing Astrophysics with the SKA (AASKA14)', PoS(AASKA14)110
The measurement of Zeeman splitting in spectral lines---both in emission and absorption---can provide direct estimates of the magnetic field strength and direction in atomic and molecular clouds, both in our own Milky Way and in external galaxies. This method will probe the magnetic field in the warm and cold neutral components of the interstellar medium, providing a complement to the extensive SKA Faraday studies planning to probe the field in the ionized components.
Measuring Magnetic Field Strengths in Galactic Star-forming Regions via the Zeeman Effect with the SKA
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Queen’s University(女王大学);Kyushu University(九州大学);University of Oslo(奥斯陆大学);University College London(伦敦大学学院);DePaul University(德保罗大学);University of South Carolina(南卡罗来纳大学);Stanford University(斯坦福大学);SETI Institute(地外文明研究所);University of New Mexico(新墨西哥大学);SOKENDAI (The Graduate University for Advanced Studies)(日本高等研究院);Davidson College(戴维森学院);Nanjing University(南京大学);London School of Economics and Political Science(伦敦政治经济学院)
Measuring Magnetic Fields Near and Far with the SKA via the Zeeman Effect
National Research Council Canada(加拿大国家研究委员会);University of British Columbia(不列颠哥伦比亚大学);Stanford University(斯坦福大学);Tsinghua University(清华大学);SKA Observatory(平方公里阵列射电望远镜天文台);Univ. of Manchester(曼彻斯特大学);National Astronomical Research Institute of Thailand(泰国国家天文研究所);MIT Haystack Observatory(麻省理工学院海斯塔克天文台)
The Cosmic Radio Dipole and Observer Effects in SKA all-sky surveys
Institute for Fundamental Physics of the Universe(宇宙基础物理研究所);Royal Observatory Edinburgh(爱丁堡皇家天文台);University of Oxford(牛津大学);Yale University(耶鲁大学);The University of Sydney(悉尼大学);Guangdong Technion - Israel Institute of Technology(广东以色列理工学院)
The mass-to-flux ratio in molecular clouds. What are we really measuring?
Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique F\'ed\'erale de Lausanne (EPFL), Observatoire de Sauverny, 1290, Versoix, Switzerland
Unravelling Turbulence and Magnetic Fields in Galaxy Clusters with SKA and XRISM
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan(水泽VLBI观测站,日本国立天文台);Research School of Astronomy and Astrophysics, Australian National University(天文学与天体物理学院,澳大利亚国立大学);Department of Physics, Nagoya University(物理学系,名古屋大学)
Measuring Magnetic Fields from Water Masers in the Synchrotron Protostellar Jet in W3(H$_2$O)
我们报告了对W3(OH)大质量恒星形成复合体中Turner-Welch天体水脉泽的全偏振VLBA观测。这个对象驱动的同步加速器喷流,这是非常特殊的高质量的原恒星,并与强极化水脉泽源,W3(H $_2$ O),使其成为最佳的目标,调查的作用磁场的原恒星磁盘喷流系统的最内层尺度。水脉泽的线偏振辐射提供了局部磁场方向的线索,而圆偏振的塞曼分裂的测量提供了它的强度。水脉泽追踪同步加速器喷流中心的双极、双锥形外流。虽然在几千天文单位的尺度上,从脉泽推断出的磁场平均沿流轴取向,但在更小的尺度上(10秒到100秒天文单位),我们揭示了磁场和速度矢量之间的不对准,这是由于场分量沿激波阵面的压缩引起的。我们的测量结果支持这样一种情况,即磁场将从具有平行于冲击前气体流出速度的主导分量演变而来,其场强为几十mG(密度为$10^7$ cm $^{-3}$),主要由水脉泽激发处的激波后气体中几百mG量级的垂直分量所支配(密度为$10^9$ cm $^{-3}$)。一般的含义是,在未受干扰的(即未受冲击的)拱星气体中,流速将紧密地跟随磁场线,而在受prostostellar喷流冲击的气体中,磁场将重新配置为平行于冲击波阵面。