arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2309.04412astro-ph.CO
收藏

基于ACT-DR4 CMB引力透镜与DES-Y3宇宙剪切互相关的宇宙学研究

Cosmology from Cross-Correlation of ACT-DR4 CMB Lensing and DES-Y3 Cosmic Shear

S. Shaikh, I. Harrison, A. van Engelen, G. A. Marques, T. M. C. Abbott, M. Aguena, O. Alves, A. Amon, R. An, D. Bacon, N. Battaglia, M. R. Becker, G. M. Bernste… 展开作者

S. Shaikh, I. Harrison, A. van Engelen, G. A. Marques, T. M. C. Abbott, M. Aguena, O. Alves, A. Amon, R. An, D. Bacon, N. Battaglia, M. R. Becker, G. M. Bernstein, E. Bertin, J. Blazek, J. R. Bond, D. Brooks, D. L. Burke, E. Calabrese, A. Carnero Rosell, J. Carretero, R. Cawthon, C. Chang, R. Chen, A. Choi, S. K. Choi, L. N. da Costa, M. E. S. Pereira, O. Darwish, T. M. Davis, S. Desai, M. Devlin, H. T. Diehl, P. Doel, C. Doux, J. Elvin-Poole, G. S. Farren, S. Ferraro, I. Ferrero, A. Ferté, B. Flaugher, J. Frieman, M. Gatti, G. Giannini, S. Giardiello, D. Gruen, R. A. Gruendl, G. Gutierrez, J. C. Hill, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. M. Huffenberger, D. Huterer, D. J. James, M. Jarvis, N. Jeffrey, H. T. Jense, K. Knowles, J. Kim, D. Kramer, O. Lahav, S. Lee, M. Lima, N. MacCrann, M. S. Madhavacheril, J. L. Marshall, J. McCullough, Y. Mehta, J. Mena-Fernández, R. Miquel, J. J. Mohr, K. Moodley, J. Myles, A. Navarro-Alsina, L. Newburgh, M. D. Niemack, Y. Omori, S. Pandey, B. Partridge, A. Pieres, A. A. Plazas Malagón, A. Porredon, J. Prat, F. J. Qu, N. Robertson, R. P. Rollins, A. Roodman, S. Samuroff, C. Sánchez, E. Sanchez, D. Sanchez Cid, L. F. Secco, N. Sehgal, E. Sheldon, B. D. Sherwin, T. Shin, C. Sifón M. Smith, E. Suchyta, M. E. C. Swanson, G. Tarle, M. A. Troxel, I. Tutusaus, C. Vargas, N. Weaverdyck, P. Wiseman, M. Yamamoto, J. Zuntz

AI总结:

本研究通过测量ACT-DR4的CMB引力透镜与DES-Y3宇宙剪切的角互功率谱,去除热SZ效应污染并考虑相关系统误差,得到S₈=0.782±0.059的物质涨落幅度约束,验证了先验合理性,为后续联合分析奠定基础。

摘要:

宇宙微波背景(CMB)弱引力透镜与星系弱引力透镜的互相关,为获取宇宙学与天体物理参数的稳健约束提供了一种途径,可降低对影响单巡天项目的特定系统误差的敏感性。我们测量了阿塔卡马宇宙学望远镜(Atacama Cosmology Telescope,ACT)DR4的CMB引力透镜,与暗能量巡天(Dark Energy Survey,DES)Y3数据测得的星系弱引力透镜之间的角互功率谱。我们的基线分析使用了由ACT-DR4和$\textit{Planck}$数据推导的CMB会聚图,其中大部分由热苏尼亚耶夫-泽尔多维奇效应导致的污染已被去除,从而避免了互相关中的重要系统误差。在建模中,我们考虑了测光不确定度、乘性剪切偏差和星系内禀对齐的冗余参数。得到的互功率谱信噪比为7.1,且通过了一组零假设检验。我们利用该谱,在对冗余参数设置有信息量且依据充分的先验的条件下,推断出物质分布的涨落幅度($S_8 \boldsymbol{\u2261} σ_8 (Ω_{\rm m}/0.3)^{0.5} = 0.782\boldsymbol{\u00b1} 0.059$)。我们还通过大幅放宽这些先验并检验所得后验分布的一致性,来探究先验的有效性,结果显示二者一致,不过此时约束相对较弱。这一互相关测量结果将随着新的ACT-DR6引力透镜图得到显著提升,并将成为DES与ACT联合6x2pt分析的核心组成部分。

英文摘要:

Cross-correlation between weak lensing of the Cosmic Microwave Background (CMB) and weak lensing of galaxies offers a way to place robust constraints on cosmological and astrophysical parameters with reduced sensitivity to certain systematic effects affecting individual surveys. We measure the angular cross-power spectrum between the Atacama Cosmology Telescope (ACT) DR4 CMB lensing and the galaxy weak lensing measured by the Dark Energy Survey (DES) Y3 data. Our baseline analysis uses the CMB convergence map derived from ACT-DR4 and $\textit{Planck}$ data, where most of the contamination due to the thermal Sunyaev Zel'dovich effect is removed, thus avoiding important systematics in the cross-correlation. In our modelling, we consider the nuisance parameters of the photometric uncertainty, multiplicative shear bias and intrinsic alignment of galaxies. The resulting cross-power spectrum has a signal-to-noise ratio $= 7.1$ and passes a set of null tests. We use it to infer the amplitude of the fluctuations in the matter distribution ($S_8 \equiv σ_8 (Ω_{\rm m}/0.3)^{0.5} = 0.782\pm 0.059$) with informative but well-motivated priors on the nuisance parameters. We also investigate the validity of these priors by significantly relaxing them and checking the consistency of the resulting posteriors, finding them consistent, albeit only with relatively weak constraints. This cross-correlation measurement will improve significantly with the new ACT-DR6 lensing map and form a key component of the joint 6x2pt analysis between DES and ACT.

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。

↑