Shi Zhi-Xin, Comte Georges, Luo A-Li, Tu Liang-Ping, Zhao Yong-Heng, Wu Fu-Chao
Guang Pu Xue Yu Guang Pu Fen Xi. 2014 Nov;34(11):3132-5.
At present, most sky-subtraction methods focus on the full spectrum, not the particular location, especially for the backgroud sky around [OIII] line which is very important to low redshift quasars. A new method to precisely subtract sky lines in local region is proposed in the present paper, which sloves the problem that the width of Hβ-[OIII] line is effected by the backgroud sky subtraction. The exprimental results show that, for different redshift quasars, the spectral quality has been significantly improved using our method relative to the original batch program by LAMOST. It provides a complementary solution for the small part of LAMOST spectra which are not well handled by LAMOST 2D pipeline. Meanwhile, This method has been used in searching for candidates of double-peaked Active Galactic Nuclei.
目前，大多数天空扣除方法关注的是全光谱，而非特定位置，特别是对于低红移类星体而言非常重要的[OIII]线周围的背景天空。本文提出了一种在局部区域精确扣除天空谱线的新方法，该方法解决了Hβ-[OIII]线宽度受背景天空扣除影响的问题。实验结果表明，对于不同红移的类星体，使用我们的方法相对于LAMOST原始批处理程序，光谱质量有了显著提高。它为LAMOST二维管道处理效果不佳的一小部分LAMOST光谱提供了一种补充解决方案。同时，该方法已被用于搜索双峰活动星系核的候选体。
