On the radial velocity calibrations in the LAMOST medium-resolution spectroscopic survey of nebulae  

作　　者：Juan-Juan Ren Hong Wu Chao-Jian Wu Wei Zhang Jian-Jun Chen Chih-Hao Hsia Fan Yang Chao Liu Jian-Rong Shi Yu-Zhong Wu Hui Zhu Bin Li Zhong-Rui Bai Hao Tian Yong-Hui Hou 

机构地区：[1]CAS Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]State Key Laboratory of Lunar and Planetary Sciences,Macao University of Science and Technology,Taipa,Macao,China [5]University of Chinese Academy of Sciences,Beijing 100049,China [6]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China [7]University of Science and Technology of China,Hefei 230026,China [8]Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing 210042,China [9]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Astronomy and Astrophysics》2021年第3期1-14,共14页天文和天体物理学研究（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2017YFA0402704);the National Natural Science Foundation of China(Grant Nos.11903048,12090041,12090040,11833006,12073051,11733006,11403061,U1531118,11973060,U1631131 and 11873057);the NAOC Nebula Talents Program and the Key Research Program of Frontier Sciences,CAS(Grant No.QYZDYSSW-SLH007);supports from The Science and Technology Development Fund,Macao SAR(file No.061/2017/A2 and 0007/2019/A);Faculty Research Grants of the Macao University of Science and Technology(program No.FRG-19-004-SSI);Guoshoujing Telescope(the Large Sky Area MultiObject Fiber Spectroscopic Telescope,LAMOST)is a National Major Scientific Project built by the Chinese Academy of Sciences;Funding for the project has been provided by the National Development and Reform Commission。

摘　　要：Accurate radial velocity determinations of optical emission lines(i.e.,[NⅡ]λλ6548,6584,Hαand[SⅡ]λλ6717,6731)are very important for investigating the kinematic and dynamic properties of nebulae.The second stage survey program of Large sky Area Multi-Object fiber Spectroscopic Telescope(LAMOST)has started a sub-survey of nebulae(MRS-N)which will spectroscopically observe the optical emission lines of a large sample of nebulae near the Galactic plane.Until now,15 MRS-N plates have been observed from September 2017 to June 2019.Based on fitting the sky emission lines in the red band spectra of MRS-N,we investigate the precision of wavelength calibration and find there are systematic deviations of radial velocities(RVs)from~0.2 to 4 km s^(-1) for different plates.Especially for the plates obtained in March 2018,the systematic deviations of RVs can be as large as~4 km s^(-1),which then go down to~0.2-0.5 kms^(-1) at the end of 2018 and January 2019.An RV calibration function is proposed for these MRS-N plates,which can simultaneously and successfully calibrate the systematic deviations and improve the precision of RVs.

关 键 词：ISM:general ISM:kinematics and dynamics technique:spectroscopic technique:radial velocities 

分 类 号：P14[天文地球—天体物理]