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arXiv 2604.04867astro-ph.CO
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利用DESI DR2和ACT DR6测量DESI追迹者的银河系-速度功率谱:通过运动学Sunyaev-Zeldovich效应

Measurement of the galaxy-velocity power spectrum of DESI tracers with the kinematic Sunyaev-Zeldovich effect using DESI DR2 and ACT DR6

Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Perimeter Institute for Theoretical Physics(理论物理前沿研究所);Berkeley Center for Cosmological Physics, Department of Physics, University of California, Berkeley(加州大学伯克利分校物理系宇宙学物理中心);Center for Cosmology and AstroParticle Physics, The Ohio State University(俄亥俄州立大学宇宙学与天体粒子物理中心);Department of Physics, The Ohio State University(俄亥俄州立大学物理系);Department of Physics, Boston University(波士顿大学物理系);Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano(米兰大学阿尔多·庞特莫利物理系);INAF-Osservatorio Astronomico di Brera(意大利国家天体物理研究所布雷拉天文台);Department of Physics & Astronomy, University College London(伦敦大学学院物理与天文学系)
Edmond Chaussidon, Selim C. Hotinli, Simone Ferraro, Kendrick Smith, Xinyi Chen, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. Cuceu, A. de la M… 展开作者

Edmond Chaussidon, Selim C. Hotinli, Simone Ferraro, Kendrick Smith, Xinyi Chen, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. Cuceu, A. de la Macorra, B. Dey, P. Doel, A. Font-Ribera, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, J. Guy, H. K. Herrera-Alcantar, K. Honscheid, C. Howlett, D. Huterer, M. Ishak, R. Joyce, D. Kirkby, A. Kremin, O. Lahav, M. Landriau, L. Le Guillou, M. Manera, A. Meisner, R. Miquel, S. Nadathur, J. A. Newman, N. Palanque-Delabrouille, W. J. Percival, F. Prada, I. Pérez-Ràfols, G. Rossi, L. Samushia, E. Sanchez, D. Schlegel, M. Schubnell, H. Seo, J. Silber, D. Sprayberry, G. Tarlé, B. A. Weaver, C. Yèche, R. Zhou

AI总结:

利用DESI DR2和ACT DR6数据,通过运动学Sunyaev-Zeldovich效应重建银河系速度场,发现LRGB、ELG和QSO的速度-银河系交叉相关性,以及首次检测到速度-速度相关性,并约束局部型原初非高斯性PNG。

摘要:

高分辨率CMB温度图与星系调查的联合分析为通过运动学Sunyaev-Zeldovich(kSZ)效应重建底层物质分布的径向速度场提供了一种独特方法。利用Atacama Cosmology Telescope(ACT)DR6和Dark Energy Spectroscopic Instrument(DESI)DR2的数据,我们对亮红星系(LRGs)、发射线星系(ELGs)和类星体(QSOs)进行了径向速度重建。利用光谱数据,我们能够可靠地建模前景污染,并报告其对主要可观测变量影响极小。我们检测到LRGs的速度-银河系交叉相关性在17.0σ水平,首次在ELGs中达到8.3σ,QSOs中达到6.8σ。我们还首次利用LRGs检测到速度-速度相关性在3.1σ水平,以及迄今为止最高累积的kSZ效应检测在20.8σ水平。与之前的成果相似,我们发现kSZ信号的幅度低于我们假设的Battaglia模型预测和电子剖面。结合这些新观测结果,我们获得了局部型原初非高斯性(PNG)的约束:f_{\rm NL}^{\rm loc} = 15.9_{-34.4}^{+34.6}(68%置信度),这是迄今为止从速度场中得出的最紧约束。本文所展示的测量在最大的尺度上(k<0.004~Mpc^{-1})已经表现出比银河系自相关更低的噪声,突显了这些观测在未来的CMB实验如Simons Observatory中的关键作用。

英文摘要:

Joint analyses of high-resolution CMB temperature maps with galaxy surveys provide a unique way to reconstruct the radial velocity field of the underlying matter distribution via the kinematic Sunyaev-Zeldovich (kSZ) effect. Using data from the Atacama Cosmology Telescope (ACT) DR6 and the Dark Energy Spectroscopic Instrument (DESI) DR2, we present radial velocity reconstructions for luminous red galaxies (LRGs), emission-line galaxies (ELGs), and quasars (QSOs). Leveraging the spectroscopic data, we are able to reliably model the foreground contamination and report a negligible impact on our main observables. We detect the velocity-galaxy cross-correlation at $17.0σ$ for LRGs, and for the first time, at $8.3σ$ for ELGs and $6.8σ$ for QSOs. We further report the first detection of the velocity-velocity correlation using LRGs at $3.1σ$, as well as the highest cumulative detection of the kSZ effect to date at $20.8 σ$. Similarly to previous results, we find a lower amplitude of the kSZ signal compared to our fiducial halo model prediction and electron profile assuming a Battaglia profile. Combining these new observables, we obtain constraints on local-type primordial non-Gaussianity (PNG): $f_{\rm NL}^{\rm loc} = 15.9_{-34.4}^{+34.6}$ at 68\% confidence, which represents the tightest constraint to date derived from the velocity field. The measurements presented here already exhibit lower noise on a per-mode basis than the galaxy auto-correlation on the largest scales, $k<0.004~\rm{Mpc^{-1}}$, highlighting the key role these observables will play in the context of future CMB experiments such as the Simons Observatory.

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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