LAMOST减天光方案研究

Research on sky subtraction for LAMOST

首先参考SDSS(the sloan digital sky survey)的经验,初步确立了大天区面积多目标光纤光谱望远镜二维光纤光谱数据处理流程,完成了LAMOST二维光纤光谱数据处理软件1.0版,并用模拟数据进行了测试,结果表明,该软件能基本满足LAMOST设计要求;其次提出了基于曲面拟合天光谱减天光的方法,并给出了初步的模拟实验,实验结果表明,该方法能更有效消除天光背景空间差异导致的减天光误差.

Based on SDSS, the sky subtraction process from two-dimensional spectroscopy of LAMOST was established. Version 1.0 of 2D spectrum data processing software was also completed, which was tested with simulated data. The result indicates that the process could basically meet the design requirement of LAMOST. Finally, a sky subtraction method was presented based on surface fitting sky spectrum, and the simulation results show that the method can improve the precision of sky subtraction because of spatial variations in the sky background.