INGRID Narrow Band Filters


INGRID will have ten narrow band filters available for observations at Cassegrain and Nasmyth (for ELECTRA/NAOMI) foci.  All filters were purchased in collaboration with the Gemini filter buying consortium (headed by Alan Tokunaga) and are specified for adaptive optics observations unless noted. See also the INGRID broad band filters.

Important note: the filter transmission curves as presented below were measured at room temperature. The actual centre wavelengths at the operational temperature of INGRID are shifted 10-20 nm shortwards. Follow the links in the first column of the table for information on the individual filters.


 
Filter Name
Availability
Cut On Wavelength
(microns)
Central Wavelength
(microns)
Cut Off Wavelength
(microns)
Comments
He I_A
On order
1.075
1.083
1.091
-
Pa-gamma
On order
1.086
1.094
1.102
-
J-continuum
On order
1.198
1.207
1.216
-
Pa-beta
On order
1.272
1.282
1.292
-
H-continuum
Currently available
1.558
1.570
1.582
-
[FeII]
Currently available
1.632
1.644
1.656
-
H2 v=1-0
Currently available
2.106
2.122
2.138
-
Br-gamma
Currently available
2.150
2.173
2.182
-
H2 v=2-1
Currently available
2.231
2.248
2.265
-
K-continuum
Currently available
2.253
2.270
2.287
-
Last edited: 29 March 2001
Email: knapen [at] ing.iac.es