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arXiv 2103.14121astro-ph.CO
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z_eff = 0.11时BAO角标度与SDSS蓝星系

BAO angular scale at z_eff = 0.11 with the SDSS blue galaxies

E. de Carvalho, A. Bernui, F. Avila, C. P. Novaes, J. P. Nogueira-Cavalcante

摘要:

我们使用斯隆数字巡天(SDSS)的蓝星系样本作为宇宙学示踪剂,测量了局域宇宙中的横向重子声振荡(BAO)信号。该方法对宇宙学模型的依赖性较弱,适用于在薄红移仓中进行二维分析,以研究$z {\in} [0.105, 0.115]$区间的SDSS数据。我们在$z_{eff} = 0.11$检测到横向BAO信号$θ_{BAO} = 19.8^° {\pm} 1.05^°$,具有统计学意义$2.2 σ$。此外,我们进行测试,确认这个角BAO签名的鲁棒性。在大量对数正态模拟的支持下,我们的误差分析包括统计和系统贡献。此外,考虑到普朗克合作组织计算的声音视界尺度$r_{s}^{Planck}$和这里获得的$θ_{BAO}$值,我们获得了角直径距离的测量值$D_{A}(0.11) = 258.31 {\pm} 13.71 \,Mpc/h$。此外,结合低红移下的$θ_{BAO}$测量和文献中报道的其他BAO角标度数据,我们对一些λ冷暗物质($Λ$ CDM)模型的宇宙学参数进行了统计分析。

英文摘要:

We measure the transverse baryon acoustic oscillations (BAO) signal in the local Universe using a sample of blue galaxies from the Sloan Digital Sky Survey (SDSS) survey as a cosmological tracer. The method is weakly dependent on a cosmological model and is suitable for 2D analyses in thin redshift bins to investigate the SDSS data in the interval $z {\in} [0.105, 0.115]$. We detect the transverse BAO signal $θ_{BAO} = 19.8^° {\pm} 1.05^°$ at $z_{eff} = 0.11$, with a statistical significance of $2.2 σ$. Additionally, we perform tests that confirm the robustness of this angular BAO signature. Supported by a large set of log-normal simulations, our error analyses include statistical and systematic contributions. In addition, considering the sound horizon scale calculated by the Planck Collaboration, $r_{s}^{Planck}$, and the $θ_{BAO}$ value obtained here, we obtain a measurement of the angular diameter distance $D_{A}(0.11) = 258.31 {\pm} 13.71 \,Mpc/h$. Moreover, combining this $θ_{BAO}$ measurement at low redshift with other BAO angular scale data reported in the literature, we perform statistical analyses for the cosmological parameters of some Lambda cold dark matter ($Λ$CDM) type models.

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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