Sky subtraction with fibres

Details Sky subtraction with fibres Sky subtraction with fibres

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257....1w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 1, July 1, 1992, p. 1-10. Research supported b

Physics

Optics

41

Astronomical Spectroscopy, Faint Objects, Fiber Optics, Night Sky, Light Scattering, Spectrographs

Scientific paper

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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