 |
NIFS Gratings
|
Below is a description of the four gratings used in NIFS. Included in this table
are the associated filter for observations with this grating, the central wavelength, spectral range, spectral resolution (2 pixel), and corresponding velocity resolution
achieved by each grating.
The standard NIFS Z, J, H and K-band settings are:
Grating
Name |
Associated Filter |
Central
Wavelength (microns) |
Spectral
Range |
Spectral
Resolution |
Velocity
Resolution (km/s) |
Z |
ZJ |
1.05 |
0.94-1.15 |
4990 |
60.1 |
J |
ZJ |
1.25 |
1.15-1.33 |
6040 |
49.6 |
H |
JH |
1.65 |
1.49-1.80 |
5290 |
56.8 |
K |
HK |
2.20 |
1.99-2.40 |
5290 |
56.7 |
However, the NIFS gratings can also be used with different filter combinations and tunable central wavelengths to reach the inter-band regions where telluric absorption is worse. The possible central wavelengths and associated filters are:
Grating
Name |
Short Wavelength Limit (microns) |
Long Wavelength Limit (microns) |
Short Wavelength Filter |
Long Wavelength Filter |
Z |
0.94 |
1.16 |
ZJ |
ZJ |
J |
1.14 |
1.36 |
ZJ |
JH |
H |
1.48 |
1.82 |
JH |
HK |
K |
1.98 |
2.41 |
HK |
HK |
![[Science Operations home]](sciopshomebtn.gif)
Last update Nov. 2005; Tracy Beck