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LAMOST Spectrograph Response Curves: Stability and Application to flux calibration | | Bing Du
; A-Li Luo
; Zhong-Rui Bai
; Xiao Kong
; Jian-Nan Zhang
; Yan-Xin Guo
; Neil James Cook
; Wen Hou
; Hai-Feng Yang
; Yin-Bi Li
; Yi-Han Song
; Jian-Jun Chen
; Fang Zuo
; Ke-Fei Wu
; Meng-Xin Wang
; You-Fen Wang
; Yong-Heng Zhao
; | | Date: |
24 Nov 2016 | | Abstract: | The task of flux calibration for LAMOST (Large sky Area Multi-Object
Spectroscopic Telescope) spectra is difficult due to many factors. For example,
the lack of standard stars, flat fielding for large field of view, and
variation of reddening between different stars especially at low galactic
latitudes etc. Poor selection, bad spectral quality, or extinction uncertainty
of standard stars not only might induce errors to the calculated spectral
response curve (SRC), but also might lead to failures in producing final 1D
spectra. In this paper, we inspected spectra with Galactic latitude |b|>=60
degree and reliable stellar parameters, determined through the LAMOST Stellar
Parameter Pipeline (LASP), to study the stability of the spectrograph. To
guarantee the selected stars had been observed by each fiber, we selected
37,931 high quality exposures of 29,000 stars from LAMOST DR2, and more than 7
exposures for each fiber. We calculated the SRCs for each fiber for each
exposure, and calculated the statistics of SRCs for spectrographs with both the
fiber variations and time variations. The result shows that the average
response curve of each spectrograph (henceforth ASPSRC) is relatively stable
with statistical errors <= 10%. From the comparison between each ASPSRC and the
SRCs for the same spectrograph obtained by 2D pipeline, we find that the
ASPSRCs are good enough to use for the calibration. The ASPSRCs have been
applied to spectra which were abandoned by LAMOST 2D pipeline due to the lack
of standard stars, increasing the number of LAMOST spectra by 52,181 in DR2.
Comparing those same targets with SDSS, the relative flux differences between
SDSS spectra and that of LAMOST spectra with the ASPSRC method are less than
10%, which underlines that the ASPSRC method is feasible for LAMOST flux
calibration. | | Source: | arXiv, 1611.8216 | | Services: | Forum | Review | PDF | Favorites | |
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