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Filters

T-ReCS contains up to 20 filters mounted in two wheels. This page describes the current set of filters.


Filter Name Central lambda
(µm)
lambda Range
(50% trans., µm)
Trans. Curve Trans. Data Temp
(K)
Notes
N' 11.2 10.1 - 12.5 10  
N (broad 10um) 10.36 7.70 - 12.97 15  
Si-1 7.73 7.39 - 8.08 77  
Si-2 8.74 8.35 - 9.13 77  
Si-3 9.69 9.22 - 10.15 77  
Si-4 10.38 9.87 - 10.89 77  
Si-5 11.66 11.09 - 12.22 77  
Si-6 12.33 11.74 - 12.92 77  
[Ar III] 8.99 8.93 - 9.06 10 (a)
[S IV] 10.52 10.37 - 10.54 10  
[Ne II] 12.81 12.68 - 12.91 10   
[Ne II] cont 13.10 12.95 - 13.17 10 (b)
PAH 8.6um 8.59 8.38 - 8.81 10 (c)
PAH 11.3um 11.30 10.98 - 11.59 10   
Qa 18.30 17.57 - 19.08 25  
Qb 24.56 23.62 - 25.54 25  
Q (broad 20.8um) 20.68 17.41 - 25.40 25 (d)
 
K 2.19 1.98 - 2.39 77 (e)
L 3.85 3.56 - 4.14 77 (e)
M 4.68 4.39 - 4.96 77 (e)

The temperature is that of the filter measurement (there is only a very small change in bandpass between 77K and the operating temperature). 

Notes:

(a) Also used as continuum reference for PAH 8.6um filter.

(b) Normally used as continuum reference for [NeII] filter.

(c) Also used as continuum reference for [Ar III] filter

(d) The Q-broad filter is only recommended for spectroscopy mode. Use with imaging mode will result in saturated images given the width of the band.

(e) The K, L and M filters are useful for target acquisition (of bright targets) but are not routinely available for science observations due to the low detector efficiency at short wavelengths.