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arXiv 2602.21058astro-ph.COastro-ph.GA
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为即将到来的大规模HI星系调查模拟21厘米发射线

Simulations of the 21cm emission line for upcoming large-scale HI galaxy surveys

ETH Zürich(苏黎世联邦理工学院);Observatoire de la Côte d’Azur, Laboratoire J-L Lagrange(蔚蓝海岸天文台J-L拉格朗日实验室);University of the Western Cape(西开普敦大学);INAF - Astronomical Observatory of Trieste(意大利国家天体物理研究所的里雅斯特天文台);IFPU - Institute for Fundamental Physics of the Universe(宇宙基础物理研究所);Centre for Astrophysics Research, University of Hertfordshire(赫特福德大学天体物理学研究中心);EPFL - Institute of Physics, Laboratory for Galaxy Evolution(洛桑联邦理工学院物理系星系演化实验室);Tianjin Normal University(天津师范大学)

Joël Mayor, Marta Spinelli, Gabriella De Lucia, Robert Yates, Alexandre Refregier, Fabio Fontanot, Lizhi Xie, Michaela Hirschmann

AI总结:

本文提出了一种框架,用于模拟大规模HI星系调查中的21厘米发射线,结合半分析模型和并合树,以预测HI可观察量并支持未来SKA天文台的调查。

摘要:

即将来临的SKA天文台星系调查将能够检测到前所未有的中性氢(HI)体积范围,其科学回报将严重依赖于HI可观察量的预测模型。在本工作中,我们提出了一种框架,用于在这样的大规模HI星系调查中模拟中性氢21厘米发射线。该框架被开发为一个模块化层,建立在半分析模型之上。特别是,我们使用Galaxy Evolution and Assembly(GAEA)和L-Galaxies半分析模型作为基础,结合Millennium模拟套件中的并合树。我们通过本地宇宙观测验证了该框架,展示了与速度函数和广义Tully-Fisher关系的一致性。基于GAEA和L-Galaxies的预测表现出相互一致性,尽管其底层物理预设不同。我们构建了包含前向建模选择函数、倾角效应和红移变宽的模拟星系目录,再现了ALFALFA调查中HI选定星系的统计分布。最后,我们为未来SKA天文台HI星系调查提供了红移分布预测。该框架为解释即将来临的大规模无线电调查和研究HI线可观察量作为宇宙学探针提供了灵活的工具。

英文摘要:

Upcoming galaxy surveys with the SKA Observatory will detect neutral hydrogen (HI) across unprecedented volumes, and their scientific return will crucially depend on predictive models for HI observables. In this work, we present a framework to simulate the neutral hydrogen 21cm emission line in such large-scale HI galaxy surveys. This framework is developed as a modular layer that builds on semi-analytical models. In particular we use as bases the Galaxy Evolution and Assembly (GAEA) and L-Galaxies semi-analytical models, coupled to merger trees from the Millennium Simulation suite. We validate our framework against local Universe observations, demonstrating consistency with velocity functions, and generalised Tully-Fisher relations. Predictions based on GAEA and L-Galaxies exhibit mutual consistency despite the distinct underlying physical prescriptions. We construct mock galaxy catalogues that incorporate forward-modelled selection functions, inclination effects, and redshift broadening, reproducing the statistical distributions of HI-selected galaxies in the ALFALFA survey. Finally, we present redshift distribution forecasts for future SKA Observatory HI galaxy surveys. This framework offers a flexible tool for interpreting upcoming large-scale radio surveys and studying HI line observables as cosmological probes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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