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arXiv 2501.09147astro-ph.CO
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来自UNIONS星系团弱透镜轮廓的宇宙学

Cosmology from UNIONS weak lensing profiles of galaxy clusters

University of Edinburgh(爱丁堡大学);Waterloo Centre for Astrophysics, University of Waterloo(滑铁卢大学天体物理中心);Department of Physics and Astronomy, University of Waterloo(滑铁卢大学物理与天文系);Institute for Astronomy, University of Hawaii(夏威夷大学天文研究所);Université Paris Cité, Université Paris-Saclay, CEA, CNRS, AIM(巴黎西岱大学、巴黎萨克雷大学、法国原子能委员会、法国国家科学研究中心、天体物理学与信息研究所);McWilliams Center for Cosmology, Carnegie Mellon University(卡内基梅隆大学麦克威廉斯宇宙学中心);Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing(波鸿鲁尔大学物理与天文学院、天文研究所(AIRUB)、德国宇宙学透镜中心);Perimeter Institute for Theoretical Physics(理论物理珀利默研究所);IRFU, CEA, Université Paris-Saclay(法国原子能委员会塞瓦耶研究物理研究所、巴黎萨克雷大学);NRC Herzberg Astronomy and Astrophysics Research Centre(加拿大国家研究委员会赫茨伯格天体物理学研究中心);Department of Physics and Astronomy, University of British Columbia(不列颠哥伦比亚大学物理与天文系)
Charlie T. Mpetha, James E. Taylor, Yuba Amoura, Roan Haggar, Thomas de Boer, Sacha Guerrini, Axel Guinot, Fabian Hervas Peters, Hendrik Hildebrandt, Michael J.… 展开作者

Charlie T. Mpetha, James E. Taylor, Yuba Amoura, Roan Haggar, Thomas de Boer, Sacha Guerrini, Axel Guinot, Fabian Hervas Peters, Hendrik Hildebrandt, Michael J. Hudson, Martin Kilbinger, Tobias Liaudat, Alan McConnachie, Ludovic Van Waerbeke, Anna Wittje

AI总结:

本研究利用UNIONS弱透镜数据测量星系团内落区质量轮廓,对宇宙学参数Ωm和σ8给出约束,并测量回溅半径,有望将星系团丰度约束改进2倍以上。

摘要:

宇宙学信息编码在星系团的结构中。在物质较少且初始密度扰动较大的宇宙中,星系团形成得更早,有更多时间吸积物质,导致其内落区域更加延展。因此,测量内落区域的平均质量分布提供了一种新颖的宇宙学检验。内落区域在很大程度上对重子物理不敏感,并且比诸如浓度等其他星系团形成时间度量提供了更干净的结构检验。我们考虑了来自三个公开星系团目录的星系团样本:eROSITA源的光谱识别(SPIDERS)目录、元目录M2C中通过X射线和Sunyaev-Zeldovich效应选择的星系团,以及暗能量光谱仪器(DESI)遗留巡天中识别的星系团。利用来自紫外近红外光学北方巡天(UNIONS)的初步形状目录,我们推导了每个样本的超额表面质量密度轮廓。然后,我们将最完整的DESI遗留样本的平均轮廓与覆盖一系列$Ω_{\rm m}$和$σ_8$的模拟套件的预测进行比较,获得约束$Ω_{\rm m}=0.34\pm 0.06$和$σ_8=0.77 \pm 0.04$。我们还测量了SPIDERS、M2C和DESI遗留成像巡天星系团的平均(共动)回溅半径,分别为$1.39^{+0.21}_{-0.18} {\rm cMpc}$、$1.77^{+0.20}_{-0.18} {\rm cMpc}/h$和$1.42^{+0.11}_{-0.12} {\rm cMpc}/h$。使用最终的UNIONS形状目录和DESI中光谱观测到的完整星系团样本进行此分析,我们预计可以将当前最佳星系团丰度研究的约束改进2倍或更多。

英文摘要:

Cosmological information is encoded in the structure of galaxy clusters. In Universes with less matter and larger initial density perturbations, clusters form earlier and have more time to accrete material, leading to a more extended infall region. Thus, measuring the mean mass distribution in the infall region provides a novel cosmological test. The infall region is largely insensitive to baryonic physics, and provides a cleaner structural test than other measures of cluster assembly time such as concentration. We consider cluster samples from three publicly available galaxy cluster catalogues: the Spectroscopic Identification of eROSITA Sources (SPIDERS) catalogue, the X-ray and Sunyaev-Zeldovich effect selected clusters in the meta-catalogue M2C, and clusters identified in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey. Using a preliminary shape catalogue from the Ultraviolet Near Infrared Optical Northern Survey (UNIONS), we derive excess surface mass density profiles for each sample. We then compare the mean profile for the DESI Legacy sample, which is the most complete, to predictions from a suite of simulations covering a range of $Ω_{\rm m}$ and $σ_8$, obtaining constraints of $Ω_{\rm m}=0.34\pm 0.06$ and $σ_8=0.77 \pm 0.04$. We also measure mean (comoving) splashback radii for SPIDERS, M2C and DESI Legacy Imaging Survey clusters of $1.39^{+0.21}_{-0.18} {\rm cMpc}$, $1.77^{+0.20}_{-0.18} {\rm cMpc}/h$ and $1.42^{+0.11}_{-0.12} {\rm cMpc}/h$ respectively. Performing this analysis with the final UNIONS shape catalogue and the full sample of spectroscopically observed clusters in DESI, we can expect to improve on the best current constraints from cluster abundance studies by a factor of 2 or more.

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