Table 4
Summary of continuum signal-to-noise (S/N) obtained per two-pixel resolution element for simulated J-band spectroscopy (texp = 10 h, R = 4000 and 10 000).
| R = 4000 | R = 10 000 | ||||||||
Seeing =  @ ZD = 35° |
Seeing =  @ ZD = 0° |
Seeing = @ ZD = 35° |
Seeing = @ ZD = 0° |
||||||
| JVEGA | Z | NGS good | NGS poor | NGS good | NGS poor | NGS good | NGS poor | NGS good | NGS poor |
|
|
|||||||||
| 20.75 | 0.0 | 266 ± 22 | 219 ± 16 | 306 ± 15 | 307 ± 40 | 163 ± 12 | 138 ± 6 | 192 ± 10 | 177 ± 7 |
| −1.0 | 260 ± 23 | 231 ± 29 | 329 ± 24 | 308 ± 28 | 169 ± 8 | 140 ± 9 | 200 ± 18 | 178 ± 9 | |
| 21.25 | 0.0 | 209 ± 26 | 173 ± 20 | 261 ± 24 | 221 ± 26 | 126 ± 13 | 100 ± 6 | 148 ± 10 | 136 ± 9 |
| −1.0 | 203 ± 18 | 170 ± 19 | 234 ± 21 | 227 ± 23 | 124 ± 11 | 101 ± 6 | 155 ± 11 | 134 ± 12 | |
| 21.75 | 0.0 | 143 ± 16 | 122 ± 20 | 180 ± 14 | 167 ± 16 | 92 ± 7 | 74 ± 5 | 110 ± 10 | 102 ± 3 |
| −1.0 | 140 ± 11 | 122 ± 7 | 184 ± 23 | 160 ± 14 | 89 ± 6 | 75 ± 6 | 111 ± 7 | 101 ± 7 | |
| 22.25 | 0.0 | 106 ± 9 | 84 ± 6 | 137 ± 14 | 127 ± 24 | 64 ± 6 | 50 ± 2 | 80 ± 7 | 69 ± 5 |
| −1.0 | 99 ± 10 | 81 ± 5 | 129 ± 20 | 114 ± 10 | 62 ± 4 | 50 ± 5 | 78 ± 6 | 72 ± 6 | |
| 22.75 | 0.0 | 71 ± 7 | 60 ± 6 | 98 ± 10 | 84 ± 4 | 45 ± 3 | 35 ± 2 | 55 ± 4 | 53 ± 5 |
| −1.0 | 72 ± 11 | 58 ± 8 | 96 ± 14 | 79 ± 7 | 44 ± 3 | 35 ± 2 | 55 ± 4 | 49 ± 2 | |
| 23.25 | 0.0 | 54 ± 5 | 40 ± 5 | 65 ± 8 | 62 ± 6 | 30 ± 2 | 24 ± 2 | 38 ± 3 | 35 ± 2 |
| −1.0 | 50 ± 8 | 39 ± 7 | 62 ± 6 | 56 ± 10 | 30 ± 2 | 23 ± 2 | 38 ± 2 | 36 ± 2 | |
| 23.75 | 0.0 | 35 ± 4 | 27 ± 3 | 45 ± 6 | 40 ± 3 | − | − | − | − |
| −1.0 | 32 ± 5 | 27 ± 4 | 40 ± 4 | 39 ± 5 | − | − | − | − | |
Notes. The quoted magnitudes are after scaling by the estimated uncertainties in the simulated PSFs (see Sect. 2.1 for further discussion and for details on the configurations of natural guide stars, “NGS”).
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