Studying the dynamical and thermal structure of the hot gaseous component in galaxy clusters by means of unprecedentedly detailed synthetic observations of advanced cosmological, hydrodynamical simulations

通过先进宇宙学、流体动力学模拟的前所未有的详细综合观测，研究星系团中热气体成分的动力学和热结构

• 批准号: 223765867
• 负责人: Privatdozent Dr. Klaus Dolag
• 金额: --
• 依托单位: Max-Planck-Institut für extraterrestrische Physik (MPE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/223765867?language=en
• 关键词: Studying; dynamical; thermal; structure; hot

Being the largest gravitationally-bound objects in the Universe, clusters can be treated as cosmological probes to constrain the underlying cosmological model. Additionally, they also represent optimal laboratories to study the baryonic physics and its interplay with structure formation.Especially when observed in at X-ray wavelength, the hot, diffuse intracluster gas (ICM) filling their potential well allows us to infer valuable information on the intrinsic structure, dynamical and evolutionary status, as well as on the thermal and chemical properties of the ICM itself. Future X-ray missions, such as ASTRO-H and ATHENA, are expected to provide very detailed insights into the properties of the ICM, with a very high precision in X-ray spectroscopy not yet reached so far. Moreover, the X-ray eROSITA all-sky survey and the follow-up missions of various current and ongoing surveys (like SPT, DES, EUCLID, etc.), will provide us with vast catalogs of X-ray detected clusters, increasing enormously the statistics for studies on scaling relations and cosmic evolution, and for cluster-based cosmological investigations.To keep the pace with observational improvements, virtual observations of numerical hydro-simulations are required, which are able to simulate very large cosmic volumes with a variety of physical processes describing the baryonic component. This will enable us to pursue forefront studies on large-scale structures and galaxy clusters, with a so-far unaccomplished accuracy. With special attention for X-ray observations, we will employ a novel X-ray photon simulator, PHOX, capable to efficiently generate synthetic observations from both huge and high-resolution simulation outputs. By means of this tool, in particular, we propose here to investigate the X-ray emission from simulated galaxy clusters, in order to deeply study the velocity field and thermo-dynamical structure of the ICM and make predictions on the detectability of these properties with the up-coming X-ray missions. This will permit, for instance, to constrain the scatter of scaling relations, study the covariance between X-ray observables and investigate the effects of Dark Energy cosmologies on the estimation of cluster global properties.

作为宇宙中最大的引力束缚天体，星系团可以被视为宇宙学探针来约束基本的宇宙学模型。特别是当在X射线波段观测时，充满其势阱的热的、弥散的团内气体（ICM）使我们能够推断出有关ICM本身的内在结构、动力学和演化状态以及热性质和化学性质的有价值的信息。未来的X射线任务，如ASTRO-H和ATHENA，预计将提供对ICM性质的非常详细的了解，X射线光谱学迄今尚未达到非常高的精度。此外，X射线eROSITA全天空调查和各种当前和正在进行的调查（如SPT，DES，欧几里得等）的后续任务，将为我们提供大量的X射线探测到的星系团星表，极大地增加了标度关系和宇宙演化研究的统计数据，并为基于星系团的宇宙学调查，为了跟上观测改进的步伐，需要虚拟观测的数值流体模拟，它能够模拟非常大的宇宙体积与各种物理过程描述重子分量。这将使我们能够对大尺度结构和星系团进行最前沿的研究，其精度迄今为止还没有达到。特别关注X射线观测，我们将采用一种新型的X射线光子模拟器PHOX，能够有效地从巨大和高分辨率的模拟输出中生成合成观测。通过这个工具，特别是，我们建议在这里调查模拟星系团的X射线辐射，以深入研究ICM的速度场和热力学结构，并预测这些属性的可探测性与即将到来的X射线任务。这将允许，例如，限制尺度关系的分散，研究X射线观测值之间的协方差，并调查暗能量宇宙学对集群全局属性估计的影响。

项目成果

Gravitational lensing in WDM cosmologies: the cross-section for giant arcs

• DOI: 10.1093/mnras/stu705
• 发表时间: 2014-04
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: H. Mahdi;M. V. Beek;P. Elahi;G. Lewis;C. Power;M. Killedar

Cluster strong lensing: a new strategy for testing cosmology with simulations

团簇强透镜：通过模拟测试宇宙学的新策略

• DOI: 10.1017/s1743921314010916
• 期刊: Proceedings of the International Astronomical Union
• 作者: Killedar;Borgani;Fabjan;Granato;Meneghetti;Planelles;Ragone-Figueroa
• 通讯作者: Ragone-Figueroa

Simulation-based marginal likelihood for cluster strong lensing cosmology

基于模拟的星团强透镜宇宙学边际似然

• DOI: 10.1093/mnras/stx2262
• 发表时间: 2018
• 期刊: arXiv: Cosmology and Nongalactic Astrophysics
• 作者: Killedar;Borgani;Fabjan;Granato;Meneghetti;Planelles;Ragone-Figueroa
• 通讯作者: Ragone-Figueroa

The overlooked potential of Generalized Linear Models in astronomy, I: Binomial regression

• DOI: 10.1016/j.ascom.2015.04.002
• 发表时间: 2014-09
• 期刊: Astron. Comput.
• 作者: R. S. Souza;E. Cameron;M. Killedar;J. Hilbe;R. Vilalta;U. Maio;V. Biffi;B. Ciardi;J. Riggs