We examine X-ray scaling relations for massive halos ($M_{500}>10^{12.3}M_\odot$) in the Simba galaxy formation simulation. The X-ray weighted luminosity, $L_X$ vs. $M_{500}$ has power-law slopes $\approx\frac{5}{3}$ and $\approx\frac{8}{3}$ above and below $10^{13.5} M_{\odot}$, deviating from the self-similarity increasingly to low masses. $T_X-M_{500}$ is self-similar above this mass, and slightly shallower below it. Comparing Simba to observed $T_X$ scalings, we find that $L_X$, $L_X$-weighted [Fe/H], and entropies at $0.1 R_{200}$ ($S_{0.1}$) and $R_{500}$ ($S_{500}$) all match reasonably well. $S_{500}-T_X$ is consistent with self-similar expectations, but $S_{0.1}-T_X$ is shallower at lower $T_X$, suggesting the dominant form of heating moves from gravitational shocks in the outskirts to non-gravitational feedback in the cores of smaller groups. Simba matches observations of $L_X$ versus central galaxy stellar mass $M_*$, predicting the additional trend that star-forming galaxies have higher $L_X(M_*)$. The electron density profiles for $M_{500}>10^{14}M_\odot$ halos show a $\sim 0.1R_{200}$ core, but at lower masses the profiles are flat at all radii. $T_X$ profiles are flat for $M_{500}<10^{13}M_{\odot}$, and increasingly centrally peaked with mass. The resulting entropy profiles are centrally depressed for the highest and lowest mass halos but flatter for intermediate-mass halos, with $S_{\rm core}\approx200-400$ keV cm$^2$. Simba's [Fe/H] profile matches observations in the core but over-predicts at larger radii, suggesting overly widespread metal distribution. We show that Simba's bipolar jet AGN feedback is most responsible for increasingly evacuating lower-mass halos, thereby suppressing core densities and raising core entropies to improve agreement with X-ray scaling relations.
Analysis of synthetic OVI absorption associated with galaxy groups in SIMBA and TNG50 simulations
School of Earth and Space Exploration, Arizona State University（亚利桑那州立大学地球与空间探索学院）；Universität Heidelberg, Zentrum für Astronomie, ITA（海德堡大学天文学中心ITA）；Institute for Astronomy, University of Edinburgh, Royal Observatory（爱丁堡大学皇家天文台天体物理研究所）；Department of Physics and Astronomy, University of the Western Cape（西开普大学物理与天文学系）
\textsc{The Three Hundred} project: The \textsc{Gizmo-Simba} run
本文介绍了\textsc{The Three Hundred}项目中的一个新的星系团模拟工具包\textsc{Gizmo-Simba}。\textsc{The Three Hundred}由324个星团的缩放再模拟组成，其中$M_{200}\gtrsim 10^{14.8}M_\odot$来自MultiDark-Planck $N$ -body模拟，使用几个流体动力学和半解析代码运行。\textsc{Gizmo-Simba}套件在非常成功的{ \sc Simba}模拟的基础上增加了一个最先进的星系形成模型，并进行了适度的重新校准，以匹配$z=0$星团恒星特性。比较\textsc{The Three Hundred}变焦运行与\textsc{Gadget-X}，我们发现内在的差异，恒星和气体质量分数的演变，BCG年龄，星系色星等图，与\textsc{Gizmo-Simba}一般提供了一个很好的匹配，以现有的数据在$z \approx 0$。\textsc{Gizmo-Simba}独特的黑洞增长和反馈模型与在中等质量范围内观测到的BH标度关系一致，并预测在目前很少观测到的高质量下斜率略有不同。\textsc{Gizmo-Simba}提供了一个新的和新颖的平台来阐明星系，气体和黑洞的共同演化在密集的宇宙环境。
CAMELS Environments: The Impact of Local Neighbours on Galaxy Evolution across the SIMBA, IllustrisTNG, ASTRID, and Swift-EAGLE Simulations
University of Connecticut（康涅狄格大学）；Korea Institute for Advanced Study（韩国高等研究院）；Yale University（耶鲁大学）；University of Michigan（密歇根大学）；University of Cambridge（剑桥大学）；Flatiron Institute（平顿研究所）
Using the Simba cosmological simulations to measure the planar relation between stellar specific angular momentum, mass and effective surface brightness
What's Missing in AGN Feedback? Lessons learnt from Magneticum, IllustrisTNG and Simba
European Southern Observatory（欧洲南方天文台）；Excellence Cluster ORIGINS（ORIGINS卓越集群）；Universitäts-Sternwarte, Fakultät für Physik, LMU（慕尼黑大学天文台，物理学院）；Instituto de Astrofísica de Andalucía (IAA-CSIC)（安达卢西亚天体物理学研究所）
Investigating the residuals in the $M_\bullet-M_*$ relation using the SIMBA cosmological simulation
Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；the University of Chinese Academy of Sciences（中国科学院大学）；Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理研究所）；Department of Physics, University of Connecticut（康涅狄格大学物理系）
Populating Galaxies Into Halos Via Machine Learning on the Simba Simulation
School of Mathematics and Physics, University of Queensland（昆士兰大学数学与物理学院）；Institute for Astronomy, Royal Observatory, Edinburgh（爱丁堡皇家天文台天体物理研究所）；School of Physical Sciences, National Institute of Science Education and Research, HBNI（印度国家科学教育与研究中心物理科学学院，HBNI）；Departamento de Física Teórica, Universidad Autónoma de Madrid（马德里自治大学理论物理系）；Centro de Investigación Avanzada en Física Fundamental (CIAFF), Facultad de Ciencias, Universidad Autónoma de Madrid（马德里自治大学理学院基础物理高级研究中心）；Department of Physics and Astronomy, University of the Western Cape（西开普大学物理与天文学系）
Black Hole-Galaxy Correlations in Cluster Zoomed-in Simulations: GIZMO-SIMBA and TNG-Cluster
Sun Yat-Sen University（中山大学）；Universidad Autónoma de Madrid（马德里自治大学）；University of Edinburgh（爱丁堡大学）；University of Modena and Reggio Emilia（摩德纳和雷焦艾米利亚大学）；Shanghai Jiao Tong University（上海交通大学）；Peking University（北京大学）
Topological Signatures of AGN Feedback in the Simba Simulations
Nagoya University（名古屋大学）；University of Edinburgh（爱丁堡大学）；University of the Western Cape（西开普大学）；The Institute of Statistical Mathematics（统计数学研究所）；Yunnan University（云南大学）
The CAMELS project: Expanding the galaxy formation model space with new ASTRID and 28-parameter TNG and SIMBA suites
Harvard-Smithsonian Center for Astrophysics（哈佛-史密松天体物理中心）；Carnegie Mellon University（卡内基梅隆大学）；Flatiron Institute（弗莱提荣研究所）；Columbia University（哥伦比亚大学）；University of Connecticut（康涅狄格大学）；Princeton University（普林斯顿大学）；University of California, Riverside（加州大学河滨分校）
Forged by Feedback: Stellar Properties of Brightest Group Galaxies in Cosmological Simulations
University of Victoria（维多利亚大学）；Institute for Astronomy, University of Edinburgh（爱丁堡大学天文研究所）；Indian Institute of Science（印度科学学院）；Aalto University（阿尔托大学）；University of Helsinki（赫尔辛基大学）；University of the Western Cape（西开普大学）
Introducing RAFIKI: Refining AGN Feedback in Kinetic Implementations
School of Earth and Space Exploration, Arizona State University（亚利桑那州立大学地球与空间探索学院）；Institute for Astronomy, Royal Observatory, University of Edinburgh（爱丁堡大学皇家天文台天体物理研究所）；Department of Physics and Astronomy, University of the Western Cape（西开普大学物理与天文学系）；Stellenbosch Institute for Advanced Studies（斯特伦博斯高等研究院）；Department of Physics and Astronomy, University of Victoria（维多利亚大学物理与天文学系）；Leverhulme Visiting Professor（莱弗休姆访问教授）；Centre for Space Research, North-West University（西北大学太空研究中心）；National Institute for Theoretical and Computational Sciences (NITheCS)（国家理论与计算科学研究所）
The impact of feedback on the evolution of gas density profiles from galaxies to clusters: a universal fitting formula from the Simba suite of simulations
