Strategies for spectroscopy on Extremely Large Telescope. III - Remapping switched fibre systems

摘要

We explore the use of remapping techniques to improve the efficiency ofhighly-multiplexed fibre systems for astronomical spectroscopy. This isparticularly important for the implementation of Diverse Field Spectroscopy(DFS, described in Paper II) using highly-multiplexed monolithic fibre systems(MFS). Diverse Field Spectroscopy allows arbitrary distributions of targetregions to be addressed to optimise observing efficiency when observingcomplex, clumpy structures such as protoclusters which will be increasinglyaccessible to Extremely Large Telescopes (ELTS). We show how the adoption ofvarious types of remapping between the input and output of a Monolithic FibreSystems can allow contiguous regions of spatial elements to be selected usingonly simple switch arrays. Finally we show how this compares in efficiency withintegral-field and multiobject spectroscopy by simulations using artificial andreal catalogues of objects. With the adoption of these mapping strategies, DFSoutperforms other techniques when addressing a range of realistic targetdistributions. These techniques are also applicable to bio-medical science andwere in fact inspired by it.