Design drivers for a wide-field multi-object spectrograph for the William Herschel Telescope




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НазваниеDesign drivers for a wide-field multi-object spectrograph for the William Herschel Telescope
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Design drivers for a wide-field multi-object spectrograph for the William Herschel Telescope


Marc Balcells1a,b, Chris R. Benna, David Carterc, Gavin B. Daltond,e, Scott C. Tragerf, Sofia Feltzingi, Marc A. W. Verheijenf, Matt Jarvisg, Will Percivalh, Don C. Abramsa, Tibor Agocsa, Anthony G. A. Brownk, Diego Canoa, Chris Evansl, Amina Helmif, Ian J. Lewisd, Ross McLurel, Reynier F. Peletierf, Ismael Pérez-Fournonb, Ray M. Sharplesm, Ian A. J. Toshe, Ignacio Trujillob, Nic Waltonj, Kyle B. Westfallf


aIsaac Newton Group of Telescopes, Apartado 321, 38700 Santa Cruz de La Palma, Canary Islands, Spain;

bInstituto de Astrofísica de Canarias, C/ Vía Láctea S/N, 38200 La Laguna, Tenerife, Spain, and Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Spain;

cAstrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, Wirral, CH41 1LD, UK;

dPhysics Department, University of Oxford, Keble Road, Oxford, OX1 3RH, UK;

eSTFC-Rutherford-Appleton Laboratory, HSIC, Didcot, OX11 0QX, UK;

fKapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands;

gCentre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, Hatfield, AL10 9AB, UK;

hInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, UK;

iLund Observatory, Box 43, SE-221 00 Lund, Sweden;

jInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK;

kLeiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA  Leiden, The Netherlands;

lUK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK;

mCentre for Advanced Instrumentation, University of Durham, South Road, Durham DH1 3LE, UK


Abstract

Wide-field multi-object spectroscopy is a high priority for European astronomy over the next decade. Most 8-10m telescopes have a small field of view, making 4-m class telescopes a particularly attractive option for wide-field instruments. We present a science case and design drivers for a wide-field multi-object spectrograph (MOS) with integral field units for the 4.2-m William Herschel Telescope (WHT) on La Palma. The instrument intends to take advantage of a future prime-focus corrector and atmospheric-dispersion corrector (Agocs et al, this conf.) that will deliver a field of view 2 deg in diameter, with good throughput from 370 to 1,000 nm.  The science programs cluster into three groups needing three different resolving powers R: (1) high-precision radial-velocities for Gaia-related Milky Way dynamics, cosmological redshift surveys, and galaxy evolution studies (R = 5,000), (2) galaxy disk velocity dispersions (R = 10,000) and (3) high-precision stellar element abundances for Milky Way archaeology (R = 20,000). The multiplex requirements of the different science cases range from a few hundred to a few thousand, and a range of fibre-positioner technologies are considered. Several options for the spectrograph are discussed, building in part on published design studies for E-ELT spectrographs.  Indeed, a WHT MOS will not only efficiently deliver data for exploitation of important imaging surveys planned for the coming decade, but will also serve as a test-bed to optimize the design of MOS instruments for the future E-ELT.

    Keywords: Spectrograph, multi-object, science requirements, optical design



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