Towards the 2020 vision of the baryon content of galaxy groups and clusters
A. Kravtsov, A. Gonzalez, A. Vikhlinin, D. Marrone, A. Zabludoff, D. Nagai, M. Markevitch, B. Benson, S. Golwala, S. Myers, M. Gladders, D. Rudd, A. Evrard, C. Conroy, Steven Allen
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9 pages, Science white paper for the Astro2010 Decadal Survey with extended ref. list, 2 Figures
Groups and clusters of galaxies occupy a special position in the hierarchy of large-scale cosmic structures because they are the largest and the most massive (from ~10^13 Msun to over 10^15 Msun) objects in the universe that have had time to undergo gravitational collapse. The large masses of clusters imply that their contents have been accreted from regions of ~8-40 comoving Mpc in size and should thus be representative of the mean matter content of the universe. During the next decade sensitive multi-wavelength observations should be able to map the radial distributions of all main mass components (stars, cold, warm, and hot gas and total mass) at z<~ 1 out to the virial radius. At the same time, comparative studies of real and simulated cluster samples sould allow us to use clusters as veritable astrophysical laboratories for studying galaxy formation, as well as testing our theoretical models of structure formation and underlying assumptions about fundamental physics governing the universe.
Constraining the Baryon Content of Cosmic Filaments Using Localized Fast Radio Bursts and DESI Imaging Data
School of Physics and Astronomy, Sun Yat-Sen University（中山大学物理学院）；CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area（粤港澳大湾区宇宙线科学中心）
Influence of baryons on the orbital structure of dark matter haloes
我们使用一套最先进的高分辨率宇宙学流体动力学模拟--超大规模模拟（OverWhelmingly Large Simulations，OWLS），研究了在形成过程中由重子在暗物质晕上留下的动力学特征.我们提出了一个详细的研究实施反馈处方的影响，轨道上的暗物质粒子，恒星粒子和subhaloes，分析运行没有反馈，与恒星的反馈和反馈从超大质量黑洞。我们关注的是在z = 0（2）时维里质量约为6 x 10^{13}（~ 7 x 10^{11}）Msun/h的晕的中心区域（0. 25 r_{200}）。我们还研究了这些晕的轨道内容（不同轨道类型的相对分数）如何取决于几个关键参数，如它们的质量，红移和动力学状态。这些模拟的轨道内容的频谱分析的结果进行了比较，并量化的盒，管和不规则轨道的分数的变化。在宇宙学模拟中发现盒形轨道支配着暗物质晕的轨道结构。盒子轨道的分数与中心重子分数之间有很强的相关性。虽然辐射冷却的作用，以减少部分的盒子轨道，强反馈的实施结果在一个类似的轨道分布的暗物质唯一的情况。恒星粒子所描述的轨道内容被发现是非常相似的，从暗物质粒子的轨道，这表明，要么他们已经忘记了自己的动力学历史，或者说，subhaloes带来的恒星是没有偏见的主要分布方面显着。的subhaloes的轨道内容是在广泛的协议，在粒子分布的外部区域看到的。
The evolution of the baryonic content and mass profiles of satellite galaxies in the MTNG simulations
Universidad de Sevilla（塞维利亚大学）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯克，巴斯克科学基金会）；INFN – Istituto Nazionale di Fisica Nucleare, Sezione di Bologna（意大利国家核物理研究所博洛尼部分所）；University of Cambridge（剑桥大学）；Kavli Institute for Cosmology Cambridge（剑桥卡弗里宇宙学研究所）；Durham University（杜伦大学）；Harvard-Smithsonian Center for Astrophysics（哈佛-史密森天体物理中心）；Max Planck Institute for Astrophysics（马克斯·普朗克天体物理研究所）
