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Strategies for spectroscopy on Extremely Large Telescopes - II. Diverse-field spectroscopy

Murray, G.J; Allington-Smith, J.R


J.R Allington-Smith


The fields of view of Extremely Large Telescopes will contain vast numbers of spatial sampling elements (spaxels) as their adaptive optics systems approach the diffraction limit over wide fields. Since this will exceed the detection capabilities of any realistic instrument, the field must be dilutely sampled to extract spectroscopic data from selected regions of interest. The scientific return will be maximized if the sampling pattern provides an adaptable combination of separated independent spaxels and larger contiguous subfields, seamlessly combining integral-field and multiple-object spectroscopy. We illustrate the utility of this diverse-field spectroscopy (DFS) to cosmological studies of galaxy assembly. We show how to implement DFS with an instrument concept: the Celestial Selector. This integrates highly multiplexed monolithic fibre systems and switching networks of the type currently available in the telecommunications industry. It avoids bulky moving parts, whose limitations were noted in Paper I. In Paper III, we will investigate the optimization of such systems by varying the input–output mapping.


Murray, G., & Allington-Smith, J. (2009). Strategies for spectroscopy on Extremely Large Telescopes - II. Diverse-field spectroscopy. Monthly Notices of the Royal Astronomical Society, 399(1), 209-218.

Journal Article Type Article
Publication Date Sep 1, 2009
Deposit Date Nov 29, 2012
Publicly Available Date Jan 4, 2013
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 399
Issue 1
Pages 209-218
Keywords Instrumentation, Spectrographs,


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