nIFTy Cosmology: the clustering consistency of galaxy formation models
Arnau Pujol, Ramin A. Skibba, Enrique Gaztañaga, Andrew Benson, Jeremy Blaizot, Richard Bower, Jorge Carretero, Francisco J. Castander, Andrea Cattaneo, Sofia A… 展开作者
Arnau Pujol, Ramin A. Skibba, Enrique Gaztañaga, Andrew Benson, Jeremy Blaizot, Richard Bower, Jorge Carretero, Francisco J. Castander, Andrea Cattaneo, Sofia A. Cora, Darren J. Croton, Weiguang Cui, Daniel Cunnama, Gabriella De Lucia, Julien E. Devriendt, Pascal J. Elahi, Andreea Font, Fabio Fontanot, Juan Garcia-Bellido, Ignacio D. Gargiulo, Violeta Gonzalez-Perez, John Helly, Bruno M. B. Henriques, Michaela Hirschmann, Alexander Knebe, Jaehyun Lee, Gary A. Mamon, Pierluigi Monaco, Julian Onions, Nelson D. Padilla, Frazer R. Pearce, Chris Power, Rachel S. Somerville, Chaichalit Srisawat, Peter A. Thomas, Edouard Tollet, Cristian A. Vega-Martínez, Sukyoung K. Yi
We present a clustering comparison of 12 galaxy formation models (including Semi-Analytic Models (SAMs) and Halo Occupation Distribution (HOD) models) all run on halo catalogues and merger trees extracted from a single ΛCDM N-body simulation. We compare the results of the measurements of the mean halo occupation numbers, the radial distribution of galaxies in haloes and the 2-Point Correlation Functions (2PCF). We also study the implications of the different treatments of orphan (galaxies not assigned to any dark matter subhalo) and non-orphan galaxies in these measurements. Our main result is that the galaxy formation models generally agree in their clustering predictions but they disagree significantly between HOD and SAMs for the orphan satellites. Although there is a very good agreement between the models on the 2PCF of central galaxies, the scatter between the models when orphan satellites are included can be larger than a factor of 2 for scales smaller than 1 Mpc/h. We also show that galaxy formation models that do not include orphan satellite galaxies have a significantly lower 2PCF on small scales, consistent with previous studies. Finally, we show that the 2PCF of orphan satellites is remarkably different between SAMs and HOD models. Orphan satellites in SAMs present a higher clustering than in HOD models because they tend to occupy more massive haloes. We conclude that orphan satellites have an important role on galaxy clustering and they are the main cause of the differences in the clustering between HOD models and SAMs.
Galaxy formation in the Planck cosmology - IV. Mass and environmental quenching, conformity and clustering
我们在Henriques et al.(2015)的星系形成模拟中研究了恒星形成的猝灭随红移、环境和恒星质量的变化,该模拟在两个千禧年模拟中实现了慕尼黑半解析模型(L-GALAXIES)的更新版本,并将其扩展到普朗克宇宙学。在这个模型中,大质量星系被活动星系核的反馈淬灭,这取决于黑洞和热气体的质量,因此间接地取决于恒星的质量。此外,任何质量的卫星星系都可以通过气体的冲压压力或潮汐剥离以及通过抑制气体流入而熄灭。这种组合的过程产生淬火效率,这取决于恒星质量,主机晕质量,环境密度,距离组中心和组中心星系性质的方式同意定性与观察。一些差异仍然存在于密集的区域和靠近群体中心的地方,那里的淬火似乎仍然太有效。此外,虽然大质量星系的平均恒星年龄与观测结果一致,但假设的活动星系核反馈模型允许在后期有太多的恒星形成。活动星系核的反馈和环境效应在密度较高的环境中更强,这一事实导致了中心星系和卫星星系的淬灭之间的相关性,这大致再现了晕内观察到的一致性趋势。
4MOST Cosmology Redshift Survey (CRS): Clustering Properties of CRS Bright Galaxy and Luminous Red Galaxy Target Catalogues
University of Sussex(萨塞克斯大学);Ecole Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院);Univ Lyon, Univ Lyon1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574(里昂大学、里昂第一大学、里昂高等师范学院、法国国家科学研究中心、里昂天体物理研究中心);Durham University(杜伦大学);Monash University(蒙纳士大学)
Clustering of emission line galaxies with IllustrisTNG -- II. cosmology challenge with anisotropic correlation functions and ELG-halo connections
Center for Frontier Science, Chiba University(千叶大学前沿科学中心);Department of Physics, Graduate School of Science, Chiba University(千叶大学理学研究科物理系);RIKEN Center for Advanced Intelligence Project(理化学研究所先进智能项目中心);Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo Institutes for Advanced Study(东京大学高等研究院宇宙物理数学研究所卡弗里);Academia Sinica Institute of Astronomy and Astrophysics(中央研究院天文及天文物理研究所)
Towards Accurate Modelling of Galaxy Clustering on Small Scales: Testing the Standard $Λ\mathrm{CDM}$ + Halo Model
用晕模型解释星系的小尺度成团现象可以阐明星系与暗物质晕之间的联系。不幸的是,建模通常不够准确,无法在统计上排除模型。因此,很难使用小尺度编码的信息来测试宇宙学模型或探测星系-晕连接的微妙特征。在本文中,我们试图推动晕模型的"准确"的制度,完全数值模拟为基础的方法和统计和系统误差的仔细治疗。通过我们的前向建模方法,我们可以将聚类统计纳入传统的两点统计之外。我们使用这种建模方法来测试标准的$Λ\mathrm{CDM}$+晕模型对SDSS DR 7星系的聚类。具体地说,我们使用投影关联函数,群多重性函数和星系数密度作为约束条件。我们发现,虽然模型分别拟合每个统计量,但它很难同时拟合它们。添加组统计量会导致对模型进行更严格的测试,并对模型参数进行更严格的约束。我们探讨了不同的晕定义和宇宙学模型的影响,发现改变宇宙学有显着的差异。我们尝试的最成功的模型(普朗克宇宙学与Mvir晕)匹配的低光度星系的集群,但表现出2.3 $σ$张力与发光星系的集群,从而提供了证据,"标准"晕模型需要扩展。这项工作打开了大门,增加有趣的自由光环模型,并包括额外的聚类统计作为约束。
Cosmology with one galaxy: An analytic formula relating $Ω_{\rm m}$ with galaxy properties
New York University(纽约大学);City University of New York(纽约市立大学);Flatiron Institute(平顿研究所);Princeton University(普林斯顿大学);University of California, Berkeley(加州大学伯克利分校);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室)
Learning cosmology and clustering with cosmic graphs
Computer Vision Center - Universitat Autònoma de Barcelona(巴塞罗那自治大学计算机视觉中心);Center for Computational Astrophysics, Flatiron Institute(熨斗研究所计算天体物理学中心);Princeton University(普林斯顿大学)
The 4MOST-Cosmology Redshift Survey: Target Selection of Bright Galaxies and Luminous Red Galaxies
École Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院);University of Sussex(萨塞克斯大学);Univ Lyon, Univ Lyon1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574(里昂大学、里昂第一大学、巴黎高等师范学院、法国国家科学研究中心、里昂天体物理研究中心);Nicolaus Copernicus University(尼古拉·哥白尼大学);University of Tartu(塔尔图大学);Polish Academy of Sciences(波兰科学院)
Joint Geometric and Dynamical Constraints on Cosmology from Anisotropies in Galaxy Intrinsic-Alignment Correlations
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)(中央研究院天文及天文物理研究所);Kavli IPMU (WPI), UTIAS, The University of Tokyo(卡弗里宇宙物理学起源研究所(世界顶级学术研究中心)、东京大学宇宙射线研究所)