论文标题
在模拟的H $α$ Galaxy Redshift调查中的聚类来自Nancy Grace Roman Space望远镜
Clustering in the Simulated H$α$ Galaxy Redshift Survey from Nancy Grace Roman Space Telescope
论文作者
论文摘要
We present a realistic 2000 deg$^{2}$ H$α$ galaxy mock catalog with $1<z<2$ for the Nancy Grace Roman Space Telescope galaxy redshift survey, the High Latitude Spectroscopic Survey (HLSS), created using Galacticus, a semi-analytical galaxy formation model, and high resolution cosmological N-body simulations.星系聚类可以通过重子振荡（BAO）和红移空间失真（RSD）测量来探测暗能量和测试重力。使用我们逼真的模拟作为模拟的罗马HLSS数据，以及使用使用Ezmock创建的大量近似模拟计算的协方差矩阵，我们研究了使用相同的分析技术用于分析真实数据的相同分析技术的BAO和RSD测量的预期精度和准确性。我们发现，仅罗马H $α$星系调查就可以用2 \％的不确定性，3-6 \％不确定性的哈勃参数测量角直径距离，而在四个红船中的每一个中，每个不确定性的线性生长参数具有7 \％的不确定性。我们的现实预测说明了罗马银河调查在探测暗能和测试重力的性质方面的力量。
We present a realistic 2000 deg$^{2}$ H$α$ galaxy mock catalog with $1<z<2$ for the Nancy Grace Roman Space Telescope galaxy redshift survey, the High Latitude Spectroscopic Survey (HLSS), created using Galacticus, a semi-analytical galaxy formation model, and high resolution cosmological N-body simulations. Galaxy clustering can probe dark energy and test gravity via baryon acoustic oscillation (BAO) and redshift space distortion (RSD) measurements. Using our realistic mock as the simulated Roman HLSS data, and a covariance matrix computed using a large set of approximate mocks created using EZmock, we investigate the expected precision and accuracy of the BAO and RSD measurements using the same analysis techniques used in analyzing real data. We find that the Roman H$α$ galaxy survey alone can measure the angular diameter distance with 2\% uncertainty, the Hubble parameter with 3-6\% uncertainty, and the linear growth parameter with 7\% uncertainty, in each of four redshift bins. Our realistic forecast illustrates the power of the Roman galaxy survey in probing the nature of dark energy and testing gravity.
