ISAAC Imaging Modes

SW Imaging (SWI1) - 0.98-2.5 µm

The pixel scale is 0.1484 arcsec/pixel and the field 2.5 arcmin x 2.5 arcmin.

Click on the filter name to download the transmission curve.

SW Filters (Imaging)
Name
 Line 
Central wavelength (µm)
Width (µm)
Width (%)
SZ
1.06
0.13
13
Js  
1.24
0.16
13
J  
1.25
0.29
23
H  
1.65
0.3
18
Ks  
2.16
0.27
13
NB 1.06  
1.06
0.01
1.0
NB 1.08
He I
1.08
0.016
1.5
NB 1.19  
1.19
0.01
0.8
NB 1.21  
1.21
0.018
1.5
NB 1.26
Fe II
1.26
0.019
1.5
NB 1.28
P beta
1.28
0.019
1.5
NB 1.64
Fe II
1.64
0.025
1.5
NB 1.71  
1.71
0.026
1.5
NB 2.07
He I
2.07
0.026
1.5
NB 2.09  
2.09
0.02
1.0
NB 2.13
H2 S1
2.13
0.028
1.3
NB 2.17
Br gamma
2.17
0.028
1.3
NB 2.19  
2.19
0.03
1.3
NB 2.25  
2.25
0.03
1.3
NB 2.29  
2.29
0.03
1.3
NB 2.34
CO
2.34
0.03
1.3

Use the Exposure Time Calculator (ETC) for performance estimates.

SW Polarimetry (SWP1) - 0.9-2.5 µm

The Wollaston prism for polarimetry has the same scale as for imaging and gives a beam separation of ~ 22 arcsec.  It is used with a special mask which has 3 slots of 20 arcsec wide and can be combined with all the broad band filters plus the narrow band 1.06, 1.187, 2.09 and 2.195 filters.

LW imaging (LWI3)- 1-5 µm

The pixel scale is 0.1478 arcsec / pixel. The maximum field of view is 151 arcsec x 151 arcsec.

Click on the filter name to download the transmission curve.

LW Filters (Imaging) 
Name
Line 
Central wavelength (µm)
Width (µm)
Width (%)
NB 3.21  
3.21
0.05
1.6
NB 3.28
PAH
3.28
0.05
1.6
J+Block  
1.25
 
 
H  
1.65
0.3
18
Ks  
2.16
0.27
13

Use the Exposure Time Calculator (ETC) for performance estimates.

LW imaging (LWI4)- 3-5 µm

The scale is 0.0709 arcsec / pixel. The maximum field of view is 73 arcsec x 73 arcsec.

Click on the filter name to download the transmission curve.

LW Filters (Imaging) 
Name
Line 
Central wavelength (µm)
Width (µm)
Width (%)
L  
3.78
0.58
15
NB M  
4.66
0.10
2
NB 3.80

3.80
0.06
1.6
NB 4.07
Br alpha
4.07
0.07
1.7

Use the Exposure Time Calculator (ETC) for performance estimates.