Simulations have been performed for all Science Cases using the OPTIMOS-EVE Instrument model (see RD13). More detailed Figures can be found in RD13 illustrating that OPTIMOS-EVE is compliant with each Science Case demand.
Figure 9 Simulated results for the OPTIMOS-EVE SC1 and SC2 (excerpt from RD13). Results of the simulations are shown on the right panel(s) for each Science Case (see description in the text).
For the SC1 (mode MO-HR), simulations (Fig. 9, upper-right) give the radial velocity precision as a function of the S/N ratio in the VIS arm (blue solid line) and in the NIR arm (red solid line: with a 80 nm wide spectra range; red dashed line: with a 160 nm wide spectral range, i.e. using a larger number of detectors). Simulations show that for K=19 star, the S/N ratio reaches 100 for 1-hour exposure. For the SC2 (mode MO-MR), Fig.9 (bottom-right) shows a simulated spectrum in MO-LR mode for a red giant star in NGC 5128 (at a radius of 5×Re) corresponding to 50 hours of integration. The simulated spectrum has S/N=6.5, and by using the numerous Fe I and Ti II lines, one may determine the radial velocity and the mean metallicity with an accuracy of a few km s-1 and about 0.3 dex, respectively.
Figure 10 Simulated results for the OPTIMOS-EVE SC3 (excerpt from RD13). Results of the simulations are shown on the right panels (see description in the text).
For the SC3 (mode MO-LR), 82 galaxies at z=8.8 (m(AB)=28, f(Lya)= 10-19 ergs/cm2/s) have been simulated all over the FOV, assuming an exposure time of 40 hours with GLAO. The middle panels (Fig. 10) show the Lyman alpha line (S/N averaging to 8) detected after sky background subtraction in different fibres (black line) and the input spectrum is shown as reference (red line). Sky emission lines have not been subtracted. The right panel shows the OPTIMOS-EVE FOV and the observational setup. The sky has been sampled with 120 fibres (half of the total number of available MO bundles; see open circles). The 82 simulated galaxies are shown as blue stars, while the red stars correspond to the fibres shown in the left panels.
Figure 11 Simulated results for the OPTIMOS-EVE SC4 and SC5 (excerpt from RD13). Results of the simulations are shown on the right panel(s) for each Science Case (see description in the text).
For the SC4 (mode LI), simulations show (Fig. 11, middle-upper panel) the stellar distribution of a galaxy at z=3 from an hydrodynamic model of a merger. The velocity field over the 100kpc internal halo is recovered (upper-right panel, S/N from 3 to 100) after a spatial binning of 4x4 spaxels (10 hrs of integration). For the SC5 (mode MI): the simulated spectrum (Fig. 11, bottom-right panel) of a m(AB)=24 compact Lyman Break Galaxy is obtained by binning over four spaxels in 10 hours of integration (the scale is in erg/s/cm²/A). A zoom on absorption lines is shown on the bottom with a scale in S/N, which is sufficient to perform this science case.
The OPTical Multi Object Spectrograph 'Extreme Visual Explorer' for the European - Extremely Large Telescope - Consortium partners: GEPI, NOVA, RAL, NBI, INAF, AIP, LSW, IAG, LNA, ON
