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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

  

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Last update Nov. 2005; Tracy Beck