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arXiv 2407.07152astro-ph.COastro-ph.GA
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来自ACT与DESI测光星系的运动学Sunyaev-Zel'dovich观测:低红移与中红移处存在强重子反馈的证据

Evidence for large baryonic feedback at low and intermediate redshifts from kinematic Sunyaev-Zel'dovich observations with ACT and DESI photometric galaxies

B. Hadzhiyska, S. Ferraro, B. Ried Guachalla, E. Schaan, J. Aguilar, N. Battaglia, J. R. Bond, D. Brooks, E. Calabrese, S. K. Choi, T. Claybaugh, W. R. Coulton,… 展开作者

B. Hadzhiyska, S. Ferraro, B. Ried Guachalla, E. Schaan, J. Aguilar, N. Battaglia, J. R. Bond, D. Brooks, E. Calabrese, S. K. Choi, T. Claybaugh, W. R. Coulton, K. Dawson, M. Devlin, B. Dey, P. Doel, A. J. Duivenvoorden, J. Dunkley, G. S. Farren, A. Font-Ribera, J. E. Forero-Romero, P. A. Gallardo, E. Gaztañaga, S. Gontcho Gontcho, M. Gralla, L. Le Guillou, G. Gutierrez, J. Guy, J. C. Hill, R. Hložek, K. Honscheid, S. Juneau, T. Kisner, A. Kremin, M. Landriau, R. H. Liu, T. Louis, N. MacCrann, A. de Macorra, M. Madhavacheril, M. Manera, A. Meisner, R. Miquel, K. Moodley, J. Moustakas, T. Mroczkowski, S. Naess, J. Newman, M. D. Niemack, G. Niz, L. Page, N. Palanque-Delabrouille, B. Partridge, W. J. Percival, F. Prada, F. J. Qu, G. Rossi, E. Sanchez, D. Schlegel, M. Schubnell, N. Sehgal, H. Seo, C. Sifón, D. Spergel, D. Sprayberry, S. Staggs, G. Tarlé, C. Vargas, E. M. Vavagiakis, B. A. Weaver, E. J. Wollack, R. Zhou, H. Zou

AI总结:

本文利用ACT的kSZ效应叠加DESI亮红星系样本,以13σ显著性发现气体比暗物质更延展,表明低中红移处重子反馈较强,支持高反馈模型,为校准模拟和缓解S8张力提供新途径。

摘要:

宇宙学观测的最新进展为研究重子相对于底层物质的分布提供了前所未有的机会。在这项工作中,我们表明气体比暗物质分布更为延展,并且在 $z \lesssim 1$ 处重子反馈的量级不利于低反馈模型(例如最先进的流体动力学模拟 IllustrisTNG),而更倾向于高反馈模型(例如原始 Illustris 模拟)。这对于弥合理论与观测之间的差距以及理解星系形成和演化具有重要意义。此外,更好地掌握重子与暗物质之间的联系对未来的宇宙学分析至关重要,而目前我们对重子反馈的有限认识正阻碍着这些分析。在此,我们利用阿塔卡马宇宙学望远镜(ACT)测量运动学Sunyaev-Zel'dovich(kSZ)效应,并将其叠加在暗能量光谱仪(DESI)成像巡天的亮红星系(LRG)样本上。这是首次使用测光红移来重建星系速度的分析。由于DESI成像巡天包含大量星系,这是迄今为止信噪比最高的叠加kSZ测量:我们以13$σ$的显著性探测到信号,发现强有力的证据表明气体比暗物质分布更弥散,并且与一些常用的最先进流体动力学模拟相比,更倾向于较大的反馈。我们的工作开辟了利用kSZ效应重新校准大型流体动力学模拟的可能性。此外,我们的发现指出了一条缓解弱引力透镜巡天与宇宙微波背景(CMB)实验之间不一致(例如“低 $S_8$”张力)的途径,并为天体物理学中长期存在的谜团(例如“缺失重子”问题)提供了启示。

英文摘要:

Recent advances in cosmological observations have provided an unprecedented opportunity to investigate the distribution of baryons relative to the underlying matter. In this work, we show that the gas is more extended than the dark matter, and the amount of baryonic feedback at $z \lesssim 1$ disfavors low-feedback models such as that of state-of-the-art hydrodynamical simulation IllustrisTNG compared with high-feedback models such as that of the original Illustris simulation. This has important implications for bridging the gap between theory and observations and understanding galaxy formation and evolution. Furthermore, a better grasp of the baryon-dark matter link is critical to future cosmological analyses, which are currently impeded by our limited knowledge of baryonic feedback. Here, we measure the kinematic Sunyaev-Zel'dovich (kSZ) effect from the Atacama Cosmology Telescope (ACT), stacked on the luminous red galaxy (LRG) sample of the Dark Energy Spectroscopic Instrument (DESI) imaging survey. This is the first analysis to use photometric redshifts for reconstructing galaxy velocities. Due to the large number of galaxies comprising the DESI imaging survey, this is the highest signal-to-noise stacked kSZ measurement to date: we detect the signal at 13$σ$, finding strong evidence that the gas is more spread out than the dark matter, as well as a preference for larger feedback compared to some commonly used state-of-the-art hydrodynamical simulations. Our work opens up the possibility of recalibrating large hydrodynamical simulations using the kSZ effect. In addition, our findings point towards a way of alleviating inconsistencies between weak lensing surveys and cosmic microwave background (CMB) experiments, such as the `low $S_8$' tension, and shed light on long-standing enigmas in astrophysics, such as the `missing baryon' problem.

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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