Simulated SKA maps from Galactic 3D-emission models
X. H. Sun, W. Reich
备注:
19 pages, 15 figures, accepted for publication in Astronomy and Astrophysics. The sizes of figures have been significantly reduced. For the version with full resolution, see ftp://ftp.mpifr-bonn.mpg.de/outgoing/p098wre/sun-reich.pdf
(Abridged) We present maps for various Galactic longitudes and latitudes at 1.4 GHz, which is the frequency where deep SKA surveys are proposed. The maps are about 1.5 deg in size and have an angular resolution of about 1.6 arcsec. We analyse the maps in terms of their probability density functions (PDFs) and structure functions. Total intensity emission is more smooth in the plane than at high latitudes due to the different contributions from the regular and random magnetic field. The high latitude fields show more extended polarized emission and RM structures than those in the plane, where patchy emission structures on very small scales dominate. The RM PDFs in the plane are close to Gaussians, but clearly deviate from that at high latitudes. The RM structure functions show smaller amplitudes and steeper slopes towards high latitudes. These results emerge from the fact that much more turbulent cells are passed through by the line-of-sights in the plane. Although the simulated random magnetic field components distribute in 3D, the magnetic field spectrum extracted from the structure functions of RMs conforms to 2D in the plane and approaches 3D at high latitudes. This is partly related to the outer scale of the turbulent magnetic field, but mainly to the different lengths of the line-of-sights.
Exploring the magnetic field structure of the Milky Way with pulsars in the SKA era
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);National Key Laboratory for Radio Astronomy(射电天文学国家重点实验室)
Exploring the Magnetic Field Structure of the Milky Way with Pulsars in the SKA Era
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)
The Nearest Galactic Nucleus: Studying the Galactic Centre with SKA-Mid
Northwestern University(西北大学);Max-Planck-Institute for Radio Astronomy(马克斯·普朗克射电天文研究所);University of California Los Angeles(加州大学洛杉矶分校);University of Oxford(牛津大学);University of Hertfordshire(赫特福德大学);Astrophysics Research Institute, Liverpool John Moores University(利物浦约翰摩尔斯大学天体物理研究所);Cosmic Origins Of Life (COOL) Research DAO(宇宙生命起源(COOL)研究去中心化自治组织);Rhodes University(罗德岛大学);Institute for Research in Fundamental Sciences (IPM)(基础科学研究所);Tata Institute of Fundamental Research(塔塔基础研究所);Masaryk University(马萨里克大学);Charles University(查理大学)
Unlocking the Full Potential of SKAO Extra-galactic Science with High-multiplex Optical Spectroscopy
University of Edinburgh(爱丁堡大学);University of Bristol(布里斯托大学);University of Hertfordshire(赫特福德大学);University of Oxford(牛津大学);North-West University(西北大学);ASTRON, the Netherlands Institute for Radio Astronomy(荷兰射电天文研究所(ASTRON));University of Groningen(格罗宁根大学);University Catholic of Lyon(里昂天主教大学)
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)
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Guizhou Radio Astronomical Observatory, Guizhou University(贵州大学贵州射电天文台);University of Oxford(牛津大学);International Centre for Radio Astronomy Research (ICRAR), University of Western Australia(西澳大利亚大学国际射电天文学研究中心);Institute of Astronomy, University of Cambridge(剑桥大学天文学研究所);Queen's University(女王大学)
Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);Joint Institute for VLBI ERIC (JIVE)(甚长基线干涉测量欧洲研究共同体联合研究所);Leiden University(莱顿大学);China Three Gorges University(三峡大学);University of Tasmania(塔斯马尼亚大学);The University of Western Australia(西澳大学);University of Science and Technology of China(中国科学技术大学);Chalmers University of Technology(查尔姆斯理工大学)
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 University of Adelaide(阿德莱德大学);The University of Sydney(悉尼大学);Monash University(莫纳什大学);SKA Observatory(平方公里阵列射电望远镜天文台);CSIRO ARRC;Australian National University(澳大利亚国立大学);Western Sydney University(西悉尼大学);Curtin University(科廷大学);Tata Institute of Fundamental Research(塔塔基础研究所);McGill University(麦吉尔大学)
The 10-15 GHz radio continuum survey of the Galactic Plane with SKAO
West Virginia University(西弗吉尼亚大学);University of Geneva(日内瓦大学);Korea Astronomy and Space Science Institute (KASI)(韩国天体宇宙科学研究所);Tata Institute of Fundamental Research(塔塔基础研究所);Royal Observatory Edinburgh(爱丁堡皇家天文台);National Astronomical Observatory of Japan(日本国立天文台);Indian Institute of Space Science and Technology (IIST)(印度空间科学与技术学院);Université Paris-Saclay(巴黎萨克雷大学);University of Leeds(利兹大学);University of Manchester(曼彻斯特大学);University of Kent(肯特大学);Univ. Bordeaux(波尔多大学);Univ. Grenoble Alpes(格勒诺布尔阿尔卑斯大学);Max Planck Institute for Astronomy(马克斯·普朗克天文学研究所);Aix Marseille Univ(艾克斯-马赛大学);Sorbonne Université(索邦大学);Observatoire de Paris(巴黎天文台);University of Central Florida(中佛罗里达大学);University of Puerto Rico(波多黎各大学);Nicolaus Copernicus University in Toruń(托伦哥白尼大学);Chinese Academy of Sciences(中国科学院);Rhodes University(罗德斯大学);University of Vienna(维也纳大学);Chalmers University of Technology(查尔姆斯理工大学);Peking University(北京大学)
Spatio-kinematical structure of the Galactic Nuclear Stellar Disk revealed in VLBI astrometry of circumstellar masers
Kagoshima University(鹿儿岛大学);Nagoya University(名古屋大学);Joint Institute for VLBI ERIC(甚长基线干涉测量欧洲研究基础设施国际研究所);Leiden University(莱顿大学);University of Western Australia(西澳大学)
Small-scale Magnetic Fields in the Milky Way and Nearby Galaxies
Australian National University(澳大利亚国立大学);University of Vienna(维也纳大学);Chalmers University of Technology(查尔姆斯理工大学);The University of Calgary(卡尔加里大学);University of Florence(佛罗伦萨大学);Oberlin College(欧柏林学院);Dunlap Institute for Astronomy and Astrophysics(邓拉普天文与天体物理研究所);Canadian Institute for Theoretical Astrophysics, University of Toronto(多伦多大学加拿大理论天体物理研究所);Radboud University(拉德堡德大学)
Simulated Faraday Rotation Measures toward High Galactic Latitudes
研究了银河系高纬度地区的银河系磁场(GMF)引起的法拉第旋转测度(RM)。RM来自于GMF的全局、规则分量以及湍流、随机分量。前者基于观测,后者基于磁流体动力学湍流模拟数据。对于大量不同的GMF模型,我们产生模拟RM地图周围的银河系极点和计算各种统计量的RM地图。我们发现,观测到的银河系南北两极的RM中位数,$\sim 0.0\pm 0.5 {\rm rad m^{-2}}$和$\sim +6.3\pm 0.5 {\rm rad m^{-2}}$,很难用我们的许多替代GMF模型来解释。观察到的RM的标准差$\sim 9 {\rm rad m^{-2}}$明显大于模拟RM的标准差。观测到的RM的二阶结构函数是远远大于模拟RM,特别是在小角度尺度。我们讨论其他可能的贡献RM向高银河系纬度。除了观测误差和本征RM的背景射电源对RM的观察,我们认为,RM由于星系际磁场可能占相当大的一部分,所观察到的RM。最后,我们注意到,再现所观察到的中位数可能需要额外的组件或/和结构的GMF是不存在于我们的模型。
Identification and Study of Irregular Radio Sources with SKA Continuum Surveys
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Guangxi Normal University(广西师范大学);Xiamen University(厦门大学);Jadavpur University(贾达普大学);Zhejiang University(浙江大学)