Please, note that this list is obsolete and it is kept here only for historic reasons. See the list filters are currently available with NIRC2 in this link.
Below is a list of filters that have been ordered for NIRC-2 through a consortium with other observatories. Note that the special "HK notch" filter has a "notch" of low transmission that matches the 1.8 micron atmospheric water absorption band. The notch has half-power points of 1.80 and 1.98 microns.
|
Filter
name |
Wavelength (microns)
|
status
|
||
|---|---|---|---|---|
|
cut-on
|
center
|
cut-off
|
||
|
Z
|
0.996
|
1.033
|
1.069
|
|
|
H2O ice
|
2.974
|
3.050
|
3.126
|
|
|
CH4_s
|
1.520
|
1.570
|
1.620
|
|
|
CH4_l
|
1.640
|
1.690
|
1.740
|
|
|
Filter
name |
Wavelength (microns)
|
status
|
||
|---|---|---|---|---|
|
cut-on
|
center
|
cut-off
|
||
|
He I_A
|
1.075
|
1.083
|
1.091
|
|
|
Pa-gamma
|
1.086
|
1.094
|
1.102
|
|
|
J-continuum
|
1.198
|
1.207
|
1.216
|
|
|
Pa-beta
|
1.272
|
1.282
|
1.292
|
rec'd.
|
|
He I_B
|
2.043
|
2.059
|
2.073
|
|
|
H2 v=1-0
|
2.106
|
2.122
|
2.138
|
|
|
H2 v=2-1
|
2.231
|
2.248
|
2.265
|
rec'd.
|
|
CO (2-0)
|
2.292
|
2.316
|
2.340
|
rec'd.
|
|
PAH
|
3.270
|
3.295
|
3.320
|
|
|
Br-alpha cont
|
3.960
|
3.990
|
4.020
|
|
|
Br-alpha
|
4.022
|
4.052
|
4.082
|
|
|
Filter
name |
Wavelength (microns)
|
status
|
||
|---|---|---|---|---|
|
cut-on
|
center
|
cut-off
|
||
|
HK notch
|
1.48
1.98 |
1.89
|
1.80
2.30 |
|
|
Blocker
|
2.5
|
rec'd.
|
||