LIRIS
Long-slit Intermediate Resolution Infrared Spectrograph for the WHT
OBSERVING MODES
IMAGING MODE

The plate scale is 0.25"/pixel which provide a square FOV of 4.27 arcmin.
A set of 12 broad and narrow band filters will be available, plus a passband filter for spectroscopy. The filters were acquired via a consortium lead by  Dr. A. Tokunaga. Most filters were provided by Infrared Engineering, except the filters J, H and Ks which were provided by OCLI.
 

Filter Name
Cut-on
(in microns)
Cut-off
(in microns)
Transmission Curve



Warm Cold Data
Z 0.996 1.069   
J 1.170 1.330
H 1.470 1.780
K_s 1.990 2.310
Br-gamma 2.150 2.190
J-continuum
1.222
1.240

K-continuum 2.245 2.285
H-continuum 1.564 1.590
Pa-beta
1.285
1.305

[FeII] 1.632 1.660
H2 v=1-0 2.106 2.138
H2 v=2-1 2.22 2.262
CH4_l 1.62 1.75
He I 2.043 2.073
Bandpass 1.4 2.5

SPECTROSCOPY MODE
 

GRISMS

Low resolution grisms:



Material
l_ini
l_fin
Order
Resolution 
C_9754 0.887 1.531 1 960
C_9754 1.388 2.419 1 945



Wavelength calibration:

Grism
Ar Lamp
Xe Lamp
Sky lines
LR_ZJ
lr_zj_ar_ima
Line Maps:
jpg/
ps
lr_zj_xe_frame
Line Maps:
jpg/
ps

Line Maps:
jpg/
ps
LR_HK
frame_lr_hk_ar
Line Maps:
jpg/
ps
frame_lr_hk_xe
Line Maps:
jpg/
ps

Line Maps:
jpg/
ps


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Last modified: 08/03/02
Page mantained by: Jose Acosta and Mary Barreto