Overview | Science Cases | Simulations | Filters/Gratings | Team | IRIS ETC |
Each IRIS science case prefers specific filters for both the imager and the spectrograph. A cost effectiveness of the IRIS design is for the imager and spectrograph to operate simulataneously and share common filters. A great amount of care in the selection of filters is performed to determine the tradeoffs with field of view and spectral resolution in the spectrograph, as well as optimization of the imaging bands. For instance, optimizing narrowband filter (1%) wavelength ranges for imaging first light galaxies and for given redshift regimes for both CaII Triplet and CO bandheads in the spectrograph will play a critical role in the investigation. Selecting 5% narrowband filter bandpasses in both optimal atmospheric and astrophysical regimes has been performed for optimizing wavelength with field of view of the spectrograph.
Filter | Min λ Filter | Max λ Filter | Bandpass |
---|---|---|---|
Zbb | 0.8107 | 0.9967 | 20 |
Ybb | 0.933 | 1.151 | 20 |
Jbb | 1.135 | 1.389 | 20 |
Hbb | 1.474 | 1.8 | 20 |
Kbb | 1.975 | 2.412 | 20 |
ZN1 | 0.826 | 0.869 | 5 |
ZN2 | 0.8602 | 0.905 | 5 |
ZN3 | 0.8958 | 0.9424 | 5 |
ZN4 | 0.9329 | 0.9814 | 5 |
YN1 | 0.9714 | 1.0219 | 5 |
YN2 | 1.0116 | 1.0641 | 5 |
YN3 | 1.0533 | 1.108 | 5 |
JN1 | 1.156 | 1.2153 | 5 |
JN2 | 1.2031 | 1.2648 | 5 |
JN3 | 1.2521 | 1.3163 | 5 |
JN4 | 1.3031 | 1.3699 | 5 |
HN1 | 1.474 | 1.5495 | 5 |
HN2 | 1.534 | 1.6126 | 5 |
HN3 | 1.5965 | 1.6783 | 5 |
HN4 | 1.6615 | 1.7467 | 5 |
HN5 | 1.7292 | 1.8178 | 5 |
KN1 | 1.96 | 2.0604 | 5 |
KN2 | 2.0398 | 2.1443 | 5 |
KN3 | 2.1229 | 2.2317 | 5 |
KN4 | 2.2094 | 2.3226 | 5 |
KN4.5 | 2.275 | 2.385 | 5 |
KN5 | 2.2993 | 2.4172 | 5 |
Filter | Min λ Filter | Max λ Filter | Bandpass |
---|---|---|---|
Z | 0.83 | 0.925 | 11 |
Y | 0.97 | 1.07 | 10 |
J | 1.166 | 1.33 | 13 |
H | 1.485 | 1.781 | 18 |
Ks | 1.99 | 2.3 | 14.5 |
K | 2 | 2.4 | 18 |
CaII Trip | 0.8473 | 0.8688 | 2.5 |
HeI | 1.0776 | 1.1049 | 2.5 |
Pa-Beta | 1.275 | 1.308 | 2.5 |
FeII | 1.637 | 1.679 | 2.5 |
Br-Gamma | 2.155 | 2.21 | 2.5 |
CO | 2.2877 | 2.346 | 2.5 |
HeI | 1.0776 | 1.0884 | 1 |
J Cont | 1.2072 | 1.2193 | 1 |
Pab | 1.275 | 1.288 | 1 |
H Cont | 1.5725 | 1.5883 | 1 |
FeII | 1.637 | 1.654 | 1 |
H2 | 2.11 | 2.132 | 1 |
K Cont | 2.133 | 2.154 | 1 |
Brg | 2.155 | 2.177 | 1 |
H2 | 2.251 | 2.273 | 1 |
CO | 2.276 | 2.302 | 1 |
J Methane | 1.109 | 1.144 | 1 |
J Off | 1.225 | 1.295 | 1 |
H Methane | 1.617 | 1.687 | 1 |
H Off | 1.543 | 1.613 | 1 |
H +K | 1.5720 | 2.4120 | 43 |
Y+J | 0.9250 | 1.3400 | 37 |
IRIS uses several gratings in the Integral Field Spectrograph. Currently gratings with resolutions 4000, 8000, 10000 are being considered for the instrument. Depending on the resolution and the mode selected (Lenslet/Slicer) different combinations of Filters can be used with the instrument. The spaxels and FOV available is also depend on these modes. These combinations are shown in the following table.
# | Groove Density | Slicer Filter and Spaxels | Lenslet Filter and Spaxels | Resolution | ||
---|---|---|---|---|---|---|
1 | 365 | Zbb | Slicer 88x 45 | Zn1-Zn4 | Lenslet 128x128 | 4000 |
2 | 317 | Ybb | Slicer 88x 45 | Yn1-Yn4 | Lenslet 128x128 | 4000 |
3 | 262 | Jbb | Slicer 88x 45 | Jn1-Jn4 | Lenslet 128x128 | 4000 |
4 | 203 | Hbb | Slicer 88x 45 | Hn1-Hn5 | Lenslet 128x128 | 4000 |
5 | 151 | Kbb | Slicer 88x 45 | Kn1-Kn5 | Lenslet 128x128 | 4000 |
6 | 166 | H+K | Lenslet 16x128 | 4000 | ||
7 | 292 | Y+J | Lenslet 16x128 | 4000 | ||
8 | 748 | Zn1-Zn4 | Slicer 88x 45 | Zbb | Lenslet 16x128 | 8000 |
9 | 650 | Yn1-Yn4 | Slicer 88x 45 | Ybb | Lenslet 16x128 | 8000 |
10 | 536 | Jn1-Jn4 | Slicer 88x 45 | Jbb | Lenslet 16x128 | 8000 |
11 | 415 | Hn1-Hn5 | Slicer 88x 45 | Hbb | Lenslet 16x128 | 8000 |
12 | 323 | Kn1-Kn3 | Slicer 88x 45 | Kbb | Lenslet 16x128 | 8000 |
13 | 292 | Kn4-Kn5 | Slicer 88x 45 | Kbb | Lenslet 16x128 | 8000 |
14 | 310 | Kn1-Kn5 | Slicer 88x 45 | Kbb | Lenslet 16x128 | 8000 |
15 | 932 | Zbb | Lenslet 16x128 | 10000 | ||
16 | 808 | Ybb | Lenslet 16x128 | 10000 | ||
17 | 667 | Jbb | Lenslet 16x128 | 10000 | ||
18 | 515 | Hbb | Lenslet 16x128 | 10000 | ||
19 | 384 | Kbb | Lenslet 16x128 | 10000 |