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IRIS2 Filter Information

Filters

The current filter complement is listed below. All filters are 60mm in diameter, which is required for unvignetted operation at f/8. Most of these filters were purchased as part of the Gemini IR Filter Consortium.

 
IRIS2 Filters -  Profiles & Performance
Filter Start
(µm)
End
(µm)
Cen
(µm)
Width
(nm)
Peak
T/put
(+/-5%)
Count Rate
(e-/s)
for 16th mag star
Approx.
Sky Counts
(e-/s/pix)
Max. Exp. (s)
(<40,000 ADU/pix)
Plot Data Profile
Source
&
Comments
Z 0.996 1.069 1.033 73 70 640 50 3600 Not yet
measured
J 1.164 1.325 1.245 161 85 2360 600 300 OCLI
H 1.485 1.781 1.633 296 85 2860 3200 60 "
Ks 1.982 2.306 2.144 324 95 1940 3900 (W)
8700 (S)
40 (W)
20 (S)
"
K 2.028 2.364 2.196 336 92 1910 4700 (W)
11600 (S)
40 (W)
15 (S)
"
He I 1.075 1.091 1.083 16 50 55 IRIS2
J cont 1.185 1.212 1.201 27 58 440 "
Red leak!
Pa beta 1.264 1.290 1.276 26 61 385 "
Red leak!

H cont 1.548 1.583 1.565 35 80 500 IRIS2
[Fe II] 1.623 1.653 1.633 30 80 500 "
CH4_s 1.531 1.652 1.590 121 90 2200 "
CH4_l 1.616 1.738 1.673 122 97 2200 "
H2 nu=1-0 S(1) 2.085 2.133 2.110 46 72 440 IRIS2
Br gamma 2.136 2.182 2.158 46 75 390 NIRI
H2 nu=2-1 S(1) 2.222 2.268 2.240 46 72 330 NIRI
K cont 2.246 2.283 2.255 37 80 550 NIRI
CO (2-0) bandhead 2.278 2.312 2.295 34 68 440 IRIS2
Spectroscopic Blockers
Jshort 0.954 1.256 1.096 302 80 Custom Sci
Jlong 1.100 1.342 1.220 242 90 "
Hspect 1.445 1.820 1.623 375 90 IRIS2

Return to the main IRIS2 page.

These pages contain information on the functionality of the IRIS2 Infrared Imager and Spectrograph. Pages maintained by Stuart Ryder (sdr -@- aao.gov.au) and Paul Dobbie (pdd -@- aao.gov.au). Page last modified by Paul Dobbie.