The selection function of the LAMOST Spectroscopic Survey of the Galactic Anti-centre
The selection function of the LAMOST Spectroscopic Survey of the Galactic Anti-centre
复制标题
银河系反中心LAMOST光谱巡天的选择函数
DOI：
10.1093/mnras/sty454
复制
发表时间：
2018-05-01
影响因子：
4.8
通讯作者：
Tian, Z. -J.
中科院分区：
文献类型：
--
作者：
Chen, B. -Q.;Liu, X. -W.;Tian, Z. -J.
本文详细分析了LAMOST星系反中心光谱测量(LSS-GAC)的选择函数。LSS-GAC的设计目的是获得银河系反中心300多万颗恒星的低分辨率光谱。第二版LSS-GAC增值星表(LSS-GAC DR2)包含恒星参数，包括径向速度、大气参数、元素丰度和从LSS-GAC在2011年至2014年期间瞄准的140万颗独特恒星的180万个光谱推导出的绝对星等。对于许多使用这个数据库的研究，比如那些调查银河系化学动力学结构的研究，对调查的选择功能的详细了解是必不可少的。在这篇文章中，我们描述了如何充分详细地评估LSS-GAC的选择函数，并用LSS-GAC DR2中发布的可靠参数为所有光谱测量提供选择函数校正。这些结果将作为LSS-GAC增值目录中的新条目发布，可用于纠正用于各种目的的科学研究的目录的选择效果。
We present a detailed analysis of the selection function of the LAMOST Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC). LSS-GAC was designed to obtain low resolution optical spectra for a sample of more than 3 million stars in the Galactic anti-centre. The second release of value-added catalogues of the LSS-GAC (LSS-GAC DR2) contains stellar parameters, including radial velocity, atmospheric parameters, elemental abundances and absolute magnitudes deduced from 1.8 million spectra of 1.4 million unique stars targeted by the LSS-GAC between 2011 and 2014. For many studies using this database, such as those investigating the chemodynamical structure of the Milky Way, a detailed understanding of the selection function of the survey is indispensable. In this paper, we describe how the selection function of the LSS-GAC can be evaluated to sufficient detail and provide selection function corrections for all spectroscopic measurements with reliable parameters released in LSS-GAC DR2. The results, to be released as new entries in the LSS-GAC value-added catalogues, can be used to correct the selection effects of the catalogue for scientific studies of various purposes.