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Design drivers for a wide-field multi-object spectrograph for the William Herschel Telescope | | Marc Balcells
; Chris R. Benn
; David Carter
; Gavin B. Dalton
; Scott C. Trager
; Sofia Feltzing
; Marc A. W. Verheijen
; Matt Jarvis
; Will Percival
; Don C. Abrams
; Tibor Agocs
; Anthony G. A. Brown
; Diego Cano
; Chris Evans
; Amina Helmi
; Ian J. Lewis
; Ross McLure
; Reynier F. Peletier
; Ismael Perez-Fournon
; Ray M. Sharples
; Ian A. J. Tosh
; Ignacio Trujillo
; Nic Walton
; Kyle B. Westfall
; | | Date: |
3 Aug 2010 | | 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 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. | | Source: | arXiv, 1008.0600 | | Services: | Forum | Review | PDF | Favorites | |
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