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Title:
Sky subtraction with fibres
Authors:
Wyse, Rosemary F. G.; Gilmore, Gerard
Affiliation:
AA(Johns Hopkins University, Baltimore, MD), AB(Cambridge University Institute of Astronomy, England)
Publication:
Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 257, no. 1, July 1, 1992, p. 1-10. Research supported by NSF and Alfred P. Sloan Foundation. (MNRAS Homepage)
Publication Date:
07/1992
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, FAINT OBJECTS, FIBER OPTICS, NIGHT SKY, LIGHT SCATTERING, SPECTROGRAPHS
Bibliographic Code:
1992MNRAS.257....1W

Abstract

The fundamental intrinsic limit to sky subtraction in general, set by the inherent lumpiness of the astronomical sky, is determined, and a practical algorithm which allows data from fiber-fed spectrographs to be sky-subtracted with both precision and reliability close to this limit is presented. The general considerations discussed are of relevance to all techniques of faint-object spectroscopy, including long-slit and multislit systems. Precise and reliable sky subtraction is found to be possible with fiber systems without requiring a significant overhead in observing time, providing a factor of two potential gain in observing efficiency by obviating the perceived need for beamswitching techniques.

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