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 1111.6386astro-ph.CO
收藏

从South Pole望远镜再电离持续时间和定时的宇宙微波背景约束

Cosmic microwave background constraints on the duration and timing of reionization from the South Pole Telescope

O. Zahn, C. L. Reichardt, L. Shaw, A. Lidz, K. A. Aird, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, T. M. Crawford, A. T. Crites, T. de … 展开作者

O. Zahn, C. L. Reichardt, L. Shaw, A. Lidz, K. A. Aird, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, T. M. Crawford, A. T. Crites, T. de Haan, M. A. Dobbs, O. Dore, J. Dudley, E. M. George, N. W. Halverson, G. P. Holder, W. L. Holzapfel, S. Hoover, Z. Hou, J. D. Hrubes, M. Joy, R. Keisler, L. Knox, A. T. Lee, E. M. Leitch, M. Lueker, D. Luong-Van, J. J. McMahon, J. Mehl, S. S. Meyer, M. Millea, J. J. Mohr, T. E. Montroy, T. Natoli, S. Padin, T. Plagge, C. Pryke, J. E. Ruhl, K. K. Schaffer, E. Shirokoff, H. G. Spieler, Z. Staniszewski, A. A. Stark, K. Story, A. van Engelen, K. Vanderlinde, J. D. Vieira, R. Williamson

摘要:

再电离时代是宇宙学结构形成的里程碑,标志着第一个质量足以产生大量电离光子的物体的诞生。再电离的机制和时间尺度在很大程度上仍然未知。测量嵌入大尺度速度流中的电离气泡的CMB多普勒效应(斑片状动力学Sunyaev-Zel'dovich效应)可以限制再电离的持续时间。当结合大规模的CMB极化测量,电离分数的演变可以推断。使用新的多频数据从南极望远镜(SPT),我们表明,电离部分演变相对较快。对于我们的基本前景模型,我们发现在l=3000时,再电离产生的动力学Sunyaev-Zel'dovich功率在CL为95%时为<= 2.1 μ K^2。使用再电离模拟,我们将其转换为Δ z <= 4.4(95%CL)的再电离持续时间的限制。我们发现,这种约束依赖于假设之间的热Sunyaev-Zel'dovich功率和宇宙红外背景(CIB)的角相关性。引入相关度作为一个自由参数,我们发现kSZ功率的极限减弱到<= 4.9 μ K^2,这意味着Δ z <= 7.9(95% CL)。我们结合的SPT约束的时间再电离与WMAP 7测量的综合光学深度探测宇宙电离的历史。我们发现,在没有tSZ-CIB相关性的假设下,再电离在z > 7.2时以95% CL结束,而在允许相关性时,z>5.8。从完整的SPT数据集结合即将到来的赫歇尔和普朗克数据的改进的约束应该检测到扩展的再电离在> 95%CL提供Δ z >= 4。(略)

英文摘要:

The epoch of reionization is a milestone of cosmological structure formation, marking the birth of the first objects massive enough to yield large numbers of ionizing photons. The mechanism and timescale of reionization remain largely unknown. Measurements of the CMB Doppler effect from ionizing bubbles embedded in large-scale velocity streams (the patchy kinetic Sunyaev-Zel'dovich effect) can constrain the duration of reionization. When combined with large-scale CMB polarization measurements, the evolution of the ionized fraction can be inferred. Using new multi-frequency data from the South Pole Telescope (SPT), we show that the ionized fraction evolved relatively rapidly. For our basic foreground model, we find the kinetic Sunyaev-Zel'dovich power sourced by reionization at l=3000 to be <= 2.1 micro K^2 at 95% CL. Using reionization simulations, we translate this to a limit on the duration of reionization of Delta z <= 4.4 (95% CL). We find that this constraint depends on assumptions about the angular correlation between the thermal Sunyaev-Zel'dovich power and the cosmic infrared background (CIB). Introducing the degree of correlation as a free parameter, we find that the limits on kSZ power weaken to <= 4.9 micro K^2, implying Delta z <= 7.9 (95% CL). We combine the SPT constraint on the duration of reionization with the WMAP7 measurement of the integrated optical depth to probe the cosmic ionization history. We find that reionization ended with 95% CL at z > 7.2 under the assumption of no tSZ-CIB correlation, and z>5.8 when correlations are allowed. Improved constraints from the full SPT data set in conjunction with upcoming Herschel and Planck data should detect extended reionization at >95% CL provided Delta z >= 4. (abbreviated)

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。

↑