E. Carretti, V. Vacca, S. P. O'Sullivan, G. H. Heald, C. Horellou, H. J. A. Rottgering, A. M. M. Scaife, T. W. Shimwell, A. Shulevski, C. Stuardi, T. Vernstrom
我们使用来自LOFAR两米巡天数据发布2(LoTSS DR 2)的144 MHz旋转测量(RM)目录来测量低密度环境中河外RM(RRM:剩余RM)和源的偏振分数($p$)随红移的演化。我们还通过与NRAO VLA Sky Survey RM目录的交叉匹配在1.4 GHz处进行了相同的测量。我们发现,RRM与红移是平坦的,在144 MHz,但是,一旦红移校正,它显示出在高意义的演变。此外,$p$随着红移而演化,在$z\sim2$处减少$\sim$ 8倍。比较144-MHz和1.4-GHz的数据,我们发现,所观察到的RRM和$p$是最有可能有一个起源本地的源在1.4-GHz的,而宇宙网丝的起源是在144-MHz的青睐。如果我们将整个信号归因于细丝,我们推断每细丝的平均静止帧RRM为RRM_{0,f} = 0.71 \pm 0.07 rad m^{-2},每细丝的磁场为B_f = 32 \pm 3 nG。这与基于同步辐射叠加的互补方法获得的估计一致,并且如果原始磁场被天体物理源场播种放大,则与宇宙学模拟一致。对RRM_{0,f}的测量支持了暗条中存在扩散重子气体的说法。我们还估计了丝条磁湍流的保守上限σ_{ RRM_{0,f} } =0.039 \pm 0.001 rad m^{-2},认为有序磁场分量在丝条中占主导地位.
英文摘要:
We used the Rotation Measure (RM) catalogue derived from the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS DR2) at 144-MHz to measure the evolution with redshift of the extragalactic RM (RRM: Residual RM) and the polarization fraction ($p$) of sources in low density environments. We also measured the same at 1.4-GHz by cross-matching with the NRAO VLA Sky Survey RM catalogue. We find that RRM versus redshift is flat at 144-MHz, but, once redshift-corrected, it shows evolution at high significance. Also $p$ evolves with redshift with a decrement by a factor of $\sim$8 at $z\sim2$. Comparing the 144-MHz and 1.4-GHz data, we find that the observed RRM and $p$ are most likely to have an origin local to the source at 1.4-GHz, while a cosmic web filament origin is favoured at 144-MHz. If we attribute the entire signal to filaments, we infer a mean rest frame RRM per filament of RRM_{0,f} = 0.71 \pm 0.07 rad m^{-2} and a magnetic field per filament of B_f = 32 \pm 3 nG. This is in agreement with estimates obtained with a complementary method based on synchrotron emission stacking, and with cosmological simulations if primordial magnetic fields are amplified by astrophysical source field seeding. The measurement of an RRM_{0,f} supports the presence of diffuse baryonic gas in filaments. We also estimated a conservative upper limit of the filament magnetic turbulence of σ_{ RRM_{0,f}} =0.039 \pm 0.001 rad m^{-2}, concluding that the ordered magnetic field component dominates in filaments.
Distinguishing the nature of dark matter by mapping cosmic filaments from Lyman-alpha emission
Beijing Normal University(北京师范大学);Zhengzhou University(郑州大学);Chinese Academy of Sciences(中国科学院);Westlake University(西湖大学);Anqing Normal University(安庆师范大学)
The alignment of satellite systems with cosmic filaments in the SDSS DR12
星系和它们的卫星都是在宇宙网中形成的:宇宙中物质的大规模多尺度分布。已知周围的大尺度结构(LSS)能够影响星系的形成,例如晕或星系的自旋和形状与LSS相关,并且这种相关性取决于晕的质量或星系的形态。在这项工作中,我们使用SDSS DR 12构建的组和细丝目录来研究卫星系统和它们所在的大尺度细丝之间的相关性。我们发现,卫星的分布是显着相关的细丝,即卫星系统的主轴优先与最近的细丝的脊柱对齐。对于系统远离细丝脊柱的情况,发现更强的对准信号,而靠近细丝脊柱的系统显示出明显更弱的对准。我们的研究结果表明,卫星是沿着纤维吸积,这与以前的工作。这种远离暗条脊的情况有助于我们理解暗条的形成以及本宇宙中特殊的卫星分布。
A 15 Mpc rotating galaxy filament at redshift z = 0.032
Institute of Astronomy, University of Cambridge(剑桥大学天文学研究所);Astrophysics, Department of Physics, University of Oxford(牛津大学物理系天体物理学);Department of Physics and Astronomy, University of the Western Cape(西开普敦大学物理与天文学系);Department of Physics and Electronics, Rhodes University(罗德岛大学物理与电子学系);South African Radio Astronomy Observatory(南非射电天文台);Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire(赫特福德大学物理、天文学与数学学院天体物理研究中心);School of Physics, H.H. Wills Physics Laboratory, Tyndall Avenue, University of Bristol(布里斯托大学H.H.威尔斯物理实验室);Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh(爱丁堡大学皇家天文台天文学研究所);The Inter-University Institute for Data Intensive Astronomy (IDIA), Department of Astronomy, University of Cape Town(开普敦大学天文学系数据密集型天文学跨大学研究所)
发现红移 z = 0.032 处 15 Mpc 的旋转星系丝状结构,揭示星系角动量与宇宙网结构的关系及早期演化特征。
Tracing Galaxy Bias Through the Cosmic Web: The Role of Filaments
Universidad Técnica Federico Santa María(弗雷德里克·Santa Maria 技术大学);Pontificia Universidad Católica de Valparaíso(瓦爾帕萊索天主教大學);The University of Tokyo(東京大學);University of Pennsylvania(賓夕法尼亞大學);The Abdus Salam International Center for Theoretical Physics(阿卜杜斯·薩拉姆國際理論物理中心);Universidad Nacional de Córdoba(科爾多瓦國立大學);CONICET-UNC(阿根廷國家科學技術研究委員會-科爾多瓦大學)
Universal Dark-matter Density Profiles of Cosmic Filaments
Peking University(北京大学);Tsinghua University(清华大学);Space Telescope Science Institute(太空望远镜科学研究所);New Mexico State University(新墨西哥州立大学);Simon Fraser University(西蒙菲莎大学);University of California, Santa Cruz(加州大学圣克鲁兹分校)
Zippers and Twisters: Planes of Satellite Galaxies Emerge from Whirling and Shocking Gas Streams in the Cosmic Web
Johns Hopkins University(约翰斯·霍普金斯大学);NYC College of Technology, City University of New York(纽约市立大学学院技术学院);Graduate Center, City University of New York(纽约市立大学研究生中心);Institut d’Astrophsyique de Paris, UMR 7095, CNRS, UPMC Univ.(巴黎天体物理研究所);Kyung Hee University(庆熙大学);LSST-DA Catalyst Fellowship, LSST Discovery Alliance(LSST-DA催化剂奖学金,LSST发现联盟);Centre for Astrophysics Research, University of Hertfordshire(赫特福德大学天体物理学研究中心)
Star-forming galaxies in the cosmic web in the last 11 Gyr
Observatoire Astronomique de Strasbourg, UMR 7550, CNRS, Université de Strasbourg(斯特拉斯堡天文台);Institute for Astronomy, University of Edinburgh(爱丁堡大学天体物理研究所);Department of Physics and Astronomy, University of the Western Cape(西开普大学物理与天文学系)
The impact of cosmic filaments on starburst galaxies across cosmic times
Observatoire Astronomique de Strasbourg, UMR 7550, CNRS, Université de Strasbourg(斯特拉斯堡天文台,法国国家科学研究中心,斯特拉斯堡大学);Institut d’Astrophysique de Paris, UMR 7095, CNRS, Sorbonne Université(巴黎天体物理研究所,法国国家科学研究中心,索邦大学);SRON Netherlands Institute for Space Research(荷兰空间研究所);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡普坦天文研究所);European Space Agency/ESTEC(欧洲空间局/欧洲空间研究与技术中心);Leiden Observatory, Leiden University(莱顿大学莱顿天文台);Aix Marseille Univ, CNRS, CNES, LAM(艾克斯-马赛大学,法国国家科学研究中心,法国国家太空研究中心);The University of Texas at Austin(德克萨斯大学奥斯汀分校);Department of Physics, University of California, Santa Barbara(加州大学圣塔芭芭拉分校物理系);Cosmic Dawn Center (DAWN)(宇宙黎明中心);Institute for Computational Cosmology, Department of Physics, Durham University(杜伦大学物理系计算宇宙学研究所)
The impact of cosmic filaments on the abundance of satellite galaxies
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);The Kavli Institute for Astronomy and Astrophysics, Peking University(北京大学科维理天文与天体物理研究所);Astrophysics Center, Tianjin Normal University(天津师范大学天文中心);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学天文与空间前沿研究院);School of Physics and Laboratory of Zhongyuan Light, Zhengzhou University(郑州大学物理学院与中原之光实验室)