CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST
CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST
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DOI：
10.3847/1538-4365/ab510c
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发表时间：
2019-07
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通讯作者：
D. Korytov;Andrew P. Hearin;E. Kovacs;P. Larsen;Esteban Rangel;J. Hollowed;A. Benson;K. Heitmann;Yao-Yuan Mao;A. Bahmanyar;Chihway L. Chang;D. Campbell;J. DeRose;H. Finkel;N. Frontiere;E. Gawiser;S. Habib;B. Joachimi;F. Lanusse;Nan Li;R. Mandelbaum;C. Morrison;J. Newman;A. Pope;E. Rykoff;M. Simet;C. To;V. Vikraman;R. Wechsler;M. White
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作者：
D. Korytov;Andrew P. Hearin;E. Kovacs;P. Larsen;Esteban Rangel;J. Hollowed;A. Benson;K. Heitmann;Yao-Yuan Mao;A. Bahmanyar;Chihway L. Chang;D. Campbell;J. DeRose;H. Finkel;N. Frontiere;E. Gawiser;S. Habib;B. Joachimi;F. Lanusse;Nan Li;R. Mandelbaum;C. Morrison;J. Newman;A. Pope;E. Rykoff;M. Simet;C. To;V. Vikraman;R. Wechsler;M. White
本文介绍了cosmoDC 2，这是一个大型合成星系目录，旨在通过大型综合巡天望远镜（LSST）支持精确的暗能量科学。CosmoDC2是LSST暗能量科学合作组织（LSST DESC）进行的第二次数据挑战（DC2）的起点。该目录是基于一个万亿粒子，（4.225 Gpc）3盒宇宙学N体模拟，外环运行。它覆盖了440度2的天空区域，红移z = 3，并与当代调查的预期数密度相匹配，在r波段的震级深度为28。每个星系的特点是由众多的星系属性，包括恒星质量，形态，光谱能量分布，宽带滤波器的幅度，主机晕信息，和弱透镜剪切。cosmoDC2的大小和复杂性需要一个有效的目录生成方法，我们的方法是基于一种新的混合技术，结合基于数据的经验方法与半解析星系建模。已经实施了广泛的基于观测的验证测试，以确保cosmoDC2能够实现计划的LSST DESC DC2分析的科学目标。本文还代表了cosmoDC2数据集的正式发布，包括一个高效的阅读器，方便与数据的互动。
This paper introduces cosmoDC2, a large synthetic galaxy catalog designed to support precision dark energy science with the Large Synoptic Survey Telescope (LSST). CosmoDC2 is the starting point for the second data challenge (DC2) carried out by the LSST Dark Energy Science Collaboration (LSST DESC). The catalog is based on a trillion-particle, (4.225 Gpc)3 box cosmological N-body simulation, the Outer Rim run. It covers 440 deg2 of sky area to a redshift of z = 3 and matches expected number densities from contemporary surveys to a magnitude depth of 28 in the r band. Each galaxy is characterized by a multitude of galaxy properties including stellar mass, morphology, spectral energy distributions, broadband filter magnitudes, host halo information, and weak lensing shear. The size and complexity of cosmoDC2 requires an efficient catalog generation methodology; our approach is based on a new hybrid technique that combines data-based empirical approaches with semianalytic galaxy modeling. A wide range of observation-based validation tests has been implemented to ensure that cosmoDC2 enables the science goals of the planned LSST DESC DC2 analyses. This paper also represents the official release of the cosmoDC2 data set, including an efficient reader that facilitates interaction with the data.