Dark Energy Survey Year 1 results: measurement of the baryon acoustic oscillation scale in the distribution of galaxies to redshift 1
Dark Energy Survey Year 1 results: measurement of the baryon acoustic oscillation scale in the distribution of galaxies to redshift 1
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DOI：
10.1093/mnras/sty3351
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发表时间：
2019-03-01
影响因子：
4.8
通讯作者：
Zhang, Y.
中科院分区：
文献类型：
--
作者：
Abbott, T. M. C.;Abdalla, F. B.;Zhang, Y.
我们目前的角直径距离测量所获得的重子声学振荡（BAO）规模的星系分布从第一年的暗能量调查数据。我们考虑了一个超过130万个星系的样本，分布在1336度（2）的足迹上，0.6 < z（照片）< 1，典型的红移不确定度为0.03（1 + z）。这个样本的选择，在配套文件中充分描述，使用颜色/幅度选择，优化数密度和红移不确定性之间的权衡。我们调查的BAO信号的投影聚类使用三个公约，角分离，共动横向分离，和球谐函数。此外，我们比较了基于模板和机器学习光度红移测定的结果。我们使用1800个模拟来近似我们的样本，以产生协方差矩阵，并使我们能够验证我们的距离尺度测量方法。我们测量的角直径距离，D-A，在我们的样品除以BAO功能，r（d）的真实物理尺度的有效红移。我们获得了接近4%的距离测量D-A（z（eff）= 0.81）/r（d）= 10.75 +/- 0.43。这些结果与最近许多其他实验结果支持的平A冷暗物质和谐宇宙学模型是一致的。
We present angular diameter distance measurements obtained by locating the baryon acoustic oscillations (BAO) scale in the distribution of galaxies selected from the first year of Dark Energy Survey data. We consider a sample of over 1.3 million galaxies distributed over a footprint of 1336 deg(2) with 0.6 < z(photo) < 1 and a typical redshift uncertainty of 0.03(1 + z). This sample was selected, as fully described in a companion paper, using a colour/magnitude selection that optimizes trade-offs between number density and redshift uncertainty. We investigate the BAO signal in the projected clustering using three conventions, the angular separation, the comoving transverse separation, and spherical harmonics. Further, we compare results obtained from template-based and machine-learning photometric redshift determinations. We use 1800 simulations that approximate our sample in order to produce covariance matrices and allow us to validate our distance scale measurement methodology. We measure the angular diameter distance, D-A, at the effective redshift of our sample divided by the true physical scale of the BAO feature, r(d). We obtain close to a 4 per cent distance measurement of D-A (z(eff )= 0.81)/r(d) = 10.75 +/- 0.43. These results are consistent with the flat A cold dark matter concordance cosmological model supported by numerous other recent experimental results.