论文标题
LRG在贴花中的聚类DR8足迹：使用光度红移的重孔声振荡的距离约束
The clustering of LRGs in the DECaLS DR8 footprint: distance constraints from baryon acoustic oscillations using photometric redshifts
论文作者
论文摘要
通过利用两点相关函数的楔形方法，分析了从DECAM传统调查（贴花）获得的光度红移样品（以下称为decam遗产调查（贴花））。尽管宇宙学信息高度污染了来自星系图的光度红移中存在的不确定性，但可以在垂直构型上探测角直径距离，其中测量的相关函数被最小化。在先前的工作（Arxiv：1903.09651V2 [Astro-Ph.co]）中研究了基于最小污染的楔形相关函数的合奏，并使用模拟使用了模拟，而提取的宇宙学信息在此阈值中没有偏见。我们采用相同的方法来分析贴花中的LRG样品，这些方法将为靶向DESI足迹的三分之二的光学成像，并测量$ z = 0.69 $和$ z = 0.87 $的角直径距离为$ d_ {a}（0.697） 77 \，\ MathRM {MPC}）（r_ {d}/r_ {d，fid}）$和$ d_ {a}（0.874）=（1680 \ pm 109 \，\ pm 109 \，\ mathrm {mpc}）我们获得$ h_ {0} = 67.59 \ pm5.52 $ km/s/mpc的值，该值支持所有其他BAO结果测量的$ H_0 $，并且与$λ$ CDM模型一致。
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.
