LAMOST星系红移巡天的数值模拟研究:(Ⅰ)理论模型及模拟样本构造  

Mock LAMOST Galaxy Redshift Surveys:(Ⅰ) Methodology

作　　者：冯珑珑[1] 褚耀泉[1] 杨小虎[1] 

机构地区：[1]中国科学技术大学天体物理中心,合肥230026

出　　处：《天体物理学报》2000年第3期238-258,共21页

基　　金：国家自然科学基金

摘　　要：基于N体数值模拟技术，给出在各种宇宙学模型框架下，产生LAMOST红移巡天的模拟样本的方法．在模拟样本构造中，采用双参数的tagrange偏袒模型，并结合LAMOST的设计，考虑了径向选择效应及巡天几何的限制；同时还根据星系形态和环境的关系，进一步对模拟样本的星系形态进行分类．选择APM的亮星系样本对模型进行检验，并通过计算其角相关函数和模型进行比较．计算结果表明，对包括所有形态的星系样本，模拟样本给出了和观测相符的结果，而对基于Postman和Geller的形态一环境关系所得到的不同形态的模拟星系分布，模拟样本中的椭圆星系和透镜星系不足以解释APM亮星系样本中的成团强度，即强偏袒效应．最后，从实测角度出发，对采用的模拟方法和样本进行评估．For a wide range of cold dark matter models of galaxy formation, we present a general method for constructing mock LAMOST galaxy redshift surveys using cosmological N-body simulation. We use the two-parameter Lagrangian biased model for the construction, take into account the radial selection and survey geometry and use a local morphology-density relation to assign morphological types to the galaxies. We test the mock samples by comparing their angular correlation functions both for the whole catalogue and for different morphological types with those of the APM bright galaxy catalogue. The result shows an excellent agreement between the mock catalogue as a whole and the observations; but the E/SO galaxies of the mock sample are unable to reproduce the overall amplitude of the observed correlation. The mock catalogue should be useful when designing redshift surveys and provide a valuable aid in developing new statistical estimators and algorithm for quantifying the large scale structure of the universe.

关 键 词：LAMOST星系 宇宙大尺度结构 红移巡天 

分 类 号：P159[天文地球—天文学]