在DECaLS DR8足迹中LRG的成簇：使用光度红移的来自重子声学振荡的距离约束
The clustering of LRGs in the DECaLS DR8 footprint: distance constraints from baryon acoustic oscillations using photometric redshifts
摘要：
利用两点相关函数的楔形方法，对DECam遗产巡天（DECaLS）获得的发光红星系（Luminous Red Galeries，以下简称LRGs）的光度红移样本进行了分析，以探测宇宙距离。虽然宇宙学的信息是高度污染的光度红移从星系图中存在的不确定性，角直径的距离可以探测在垂直的配置，其中测量的相关函数是最小的污染。在先前的工作（arXiv：1903.09651v2 [astro-ph.CO]）中，使用模拟研究了基于具有最小污染的给定阈值的楔形相关函数的集合，并且提取的宇宙学信息在该阈值内是无偏的。我们应用相同的方法分析来自DECaLS的LRG样品，其将提供用于靶向三分之二的DESI足迹的光学成像，并测量$z=0.69$和$z=0.87$处的角直径距离为$D_{A}(0.697)=(1499 \pm 77\,\mathrm{Mpc})(r_{d}/r_{d,fid})$和$D_{A}(0.874)=(1680 \pm 109\,\mathrm{Mpc})(r_{d}/r_{d,fid})$，分数误差分别为5.14%和6.48%。我们得到了一个$H_{0}=67.59\pm5.52$ km/s/Mpc的值，它支持了所有其他BAO结果测量的$H_0$，并且与$Λ$ CDM模型一致。
英文摘要：
A photometric redshift sample of Luminous Red Galaxies (hereafter LRGs) obtained from The DECam Legacy Survey (DECaLS) is analysed to probe cosmic distances by exploiting the wedge approach of the two-point correlation function. Although the cosmological information is highly contaminated by the uncertainties existing in the photometric redshifts from the galaxy map, an angular diameter distance can be probed at the perpendicular configuration in which the measured correlation function is minimally contaminated. An ensemble of wedged correlation functions selected up to a given threshold based on having the least contamination was studied in the previous work (arXiv:1903.09651v2 [astro-ph.CO]) using simulations, and the extracted cosmological information was unbiased within this threshold. We apply the same methodology for analysing the LRG sample from DECaLS which will provide the optical imaging for targeting two-thirds of the DESI footprint and measure the angular diameter distances at $z=0.69$ and $z=0.87$ to be $D_{A}(0.697)=(1499 \pm 77\,\mathrm{Mpc})(r_{d}/r_{d,fid})$ and $D_{A}(0.874)=(1680 \pm 109\,\mathrm{Mpc})(r_{d}/r_{d,fid})$ with a fractional error of 5.14% and 6.48% respectively. We obtain a value of $H_{0}=67.59\pm5.52$ km/s/Mpc which supports the $H_0$ measured by all other BAO results and is consistent with $Λ$CDM model.
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