Abstract
A novel method is presented for the wavelength calibration of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The proposed method combines the arc lines and night sky lines, and can achieve high performance. Firstly, the initial wavelength calibration is performed by employing arc lines. Afterwards, the centroids of sky lines are calculated by the initial calibration results and adjusted by the gravity method iteratively. Finally, the ultimate wavelength calibration is obtained by fitting the centroids of arc lines and sky lines with their corresponding wavelengths. Experiments are performed on the data observed by LAMOST, and the results of the proposed method are more accurate than that of the calibration only by arc lines or sky lines. The calibration sky lines are dense in the red channel (5,700–9,000 Å) of LAMOST, but only a few ones are in the blue channel (3,700–5,900 Å). The new method achieves excellent results in the red channel as the substantial sky lines are employed, and the calibration accuracy of the blue channel is also enhanced in some degree by the scare sky lines.
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Acknowledgement
The authors acknowledge support from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope project team. This work was funded by National Science Foundation of China (NSFC grant 11078016).
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Wang, S., Qin, H. & Ye, Z. Wavelength calibration by combining arc and night sky lines for LAMOST. Exp Astron 28, 195–208 (2010). https://doi.org/10.1007/s10686-010-9198-x
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DOI: https://doi.org/10.1007/s10686-010-9198-x