Accurate Sky Continuum Subtraction with Fibre-fed Spectrographs
Abstract
Fibre-fed spectrographs now have throughputs equivalent to slit spectrographs. However, the sky subtraction accuracy that can be reached has often been pinpointed as one of the major issues associated with the use of fibres. Using technical time observations with FLAMES-GIRAFFE, two observing techniques, namely dual staring and cross beam-switching, were tested and the resulting sky subtraction accuracy reached in both cases was quantified. Results indicate that an accuracy of 0.6% on sky subtraction can be reached, provided that the cross beam-switching mode is used. This is very encouraging with regard to the detection of very faint sources with future fibre-fed spectrographs, such as VLT/MOONS or E-ELT/MOSAIC.
Cite
@article{arxiv.1302.3620,
title = {Accurate Sky Continuum Subtraction with Fibre-fed Spectrographs},
author = {Yanbin Yang and Myriam Rodrigues and Mathieu Puech and Hector Flores and Frederic Royer and Karen Disseau and Thiago Gonçalves and François Hammer and Michele Cirasuolo and Chris Evans and Gianluca Li Causi and Roberto Maiolino and Claudio Melo},
journal= {arXiv preprint arXiv:1302.3620},
year = {2013}
}
Comments
to appear in ESO Messenger, March 2013