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Cosmic Ray Removal in Fiber Spectroscopic Image

Publications of the Astronomical Society of the Pacific, 2017-02, Vol.129 (972), p.24004-024004 [Peer Reviewed Journal]

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Title:
Cosmic Ray Removal in Fiber Spectroscopic Image
Author: Bai, Zhongrui ; Zhang, Haotong ; Yuan, Hailong ; Carlin, Jeffrey L. ; Li, Guangwei ; Lei, Yajuan ; Dong, Yiqiao ; Yang, Huiqin ; Zhao, Yongheng ; Cao, Zihuang
Subjects: techniques: image processing
Is Part Of: Publications of the Astronomical Society of the Pacific, 2017-02, Vol.129 (972), p.24004-024004
Description: Single-exposure spectra in large spectral surveys are valuable for time domain studies such as stellar variability, but there is no available method to eliminate cosmic rays for single-exposure, multi-fiber spectral images. In this paper, we describe a new method to detect and remove cosmic rays in multi-fiber spectroscopic single exposures. Through the use of two-dimensional profile fitting and a noise model that considers the position-dependent errors, we successfully detect as many as 80% of the cosmic rays and correct the cosmic ray polluted pixels to an average accuracy of 97.8%. Multiple tests and comparisons with both simulated data and real LAMOST data show that the method works properly in detection rate, false detection rate, and validity of cosmic ray correction.
Publisher: The Astronomical Society of the Pacific
Language: English
Identifier: ISSN: 0004-6280
EISSN: 1538-3873
DOI: 10.1088/1538-3873/129/972/024004
Source: Alma/SFX Local Collection

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