WFC3 Filters
WFC3 contains a large complement of filters; 63 in the UVIS channel, and 17 in the IR channel. Below, we give basic characteristics for each filter. Reported transmittance values are for the filters only, and do not include HST optics or detector effects. Actual transmission data for all filters can be found on the WFC3 CDBS ftp site. See the STSYNPHOT site for information on how to use these data.
For transmission curves that include all HST optics and detector QE, see the throughputs page, or the Instrument Handbook.
There are 48 filter slots in the UVIS WF/PC Selectable Optical Filter Assembly (SOFA) wheels. Five of those slots are occupied by "quad filters;" each quad filter contains four different spectral elements. One slot is occupied by a grism for low resolution slitless spectroscopy from about 200 to 400 nm. The other filters have a variety of bandwidths using the WFPC2, Sloan, Washington, and Stromgen photometric systems. The positions of the filters within the SOFA are described here .
Plots and tables listed below contain the throughput for the individual filters ONLY. For system throughput curves that include HST optics and detector QE, see the throughputs page or the links below this table.
Filter Name | Description | Peak Wavelength | FWHM | Transmittance |
---|---|---|---|---|
Very Broad | ||||
F200LP | very broad | 2775 | 0.35 | |
F300X | very broad | 2775 | 0.35 | |
F350LP | very broad | 3500 | 0.95 | |
F475X | very broad | 3800 | 0.83 | |
F600LP | very broad | 6000 | 0.97 | |
F850LP | SDSS z | 8320 | 2000 | 0.59 |
Wide | ||||
F218W | ISM feature | 2175 | 300 | 0.30 |
F225W | UV | 2250 | 500 | 0.24 |
F275W | UV | 2750 | 500 | 0.30 |
F336W | U Stromgren u | 3375 | 550 | 0.68 |
F390W | Washington C | 3900 | 1000 | 0.84 |
F438W | WFPC2 B | 4320 | 695 | 0.76 |
F475W | SDSS g | 4750 | 1520 | 0.81 |
F555W | WFPC2 V | 5410 | 1605 | 0.80 |
F606W | WFPC2 Wide V | 5956 | 2340 | 0.87 |
F625W | SDSS r | 6250 | 1550 | 0.89 |
F775W | SDSS i | 7760 | 1470 | 0.82 |
F814W | WFPC2 Wide I | 8353 | 2555 | 0.93 |
Medium | ||||
F390M | medium blue | 3900 | 200 | 0.79 |
F410M | Stromgren v | 4105 | 190 | 0.61 |
F467M | Stromgren b | 4675 | 230 | 0.75 |
F547M | Stromgren y | 5475 | 710 | 0.78 |
F621M | 11% filter | 6212 | 640 | 0.85 |
F689M | 11% filter | 6886 | 710 | 0.88 |
F763M | 11% filter | 7630 | 780 | 0.91 |
F845M | 11% filter | 8454 | 870 | 0.92 |
Narrow | ||||
F280N | Mg II 2795/2802 | 2798 | 42 | 0.18 |
F343N | [NeV ] 3426 | 3426 | 228 | 0.69 |
F373N | [O II ] 3726/29 | 3732 | 38 | 0.76 |
F395N | Ca II H&K | 3950 | 61 | 0.84 |
F469N | He II 4686 | 4686 | 32 | 0.67 |
F487N | HBeta 4861 | 4867 | 45 | 0.83 |
F502N | [O III ] 5007 | 5013 | 47 | 0.83 |
F631N | [O I ] 6300++[S III ] | 6306 | 54 | 0.79 |
F645N | Continuum | 6455 | 82 | 0.78 |
F656N | H Alpha 6563 | 6563 | 14 | 0.80 |
F657N | Wide H Alpha +[N III ] | 6573 | 94 | 0.83 |
F658N | [N II ] 6583 | 6585 | 20 | 0.70 |
F665N | Redshifted (H Alpha +[N II ]) | 6654 | 94 | 0.88 |
F673N | [S II ] 6717,31 | 6731 | 77 | 0.75 |
F680N | Redshifted (H Alpha +[N II ]) | 6902 | 288 | 0.93 |
F953N | [S III ] 9532 | 9532 | 64 | 0.87 |
Quads | ||||
F232N | [C II ] 2326 | 2326 | 36 | 0.10 |
F243N | [Ne IV ] 2425 | 2425 | 36 | 0.13 |
F378N | Redshifted ([O II ] 3727) | 3780 | 80 | 0.78 |
F387N | [Ne III ] 3869 | 3869 | 26 | 0.67 |
F422M | continuum | 4220 | 108 | 0.61 |
F436N | [O III ] 4363+H | 4364 | 30 | 0.65 |
F437N | [O III ]4363 | 4368 | 26 | 0.64 |
F492N | Redshifted H Beta | 4924 | 78 | 0.84 |
F508N | Redshifted [O III ] 5007 | 5081 | 112 | 0.83 |
F575N | [N II ] 5755 | 5755 | 12 | 0.77 |
F619N | CH4 6194 | 6194 | 62 | 0.88 |
F634N | 6194 cont.+ | 6340 | 63 | 0.75 |
F672N | [S II ] 6717 | 6716 | 14 | 0.87 |
F674N | [S II ] 6731 | 6731 | 14 | 0.63 |
F727N | CH4 7270 | 7270 | 73 | 0.73 |
F750N | 7270 cont. | 7504 | 75 | 0.74 |
F889N | 25/km-agt | 8890 | 89 | 0.84 |
F906N | 2.5/km-agt | 9060 | 91 | 0.85 |
F924N | 0.25/km-agt | 9240 | 92 | 0.81 |
F937N | 0.025/km-agt | 9370 | 94 | 0.81 |
Grism | ||||
G280 | UV grism | 2775 | 1850 | 0.40 |
There are 18 filter slots in the IR channel. Fifteen of them span broad- and medium-band wavelengths that range from 800nm to 1900nm. Two are grisms for slitless spectroscopy, and there is one blank position.
Plots and tables listed below contain the throughput for the individual filters ONLY. For system throughput curves that include HST optics and detector QE, see the throughputs page or the links below this table.
NOTE: These filter throughput measurements were made in air, not vacuum.
Filter Name | Description | Peak Wavelength (microns) | FWHM (microns) | Transmittance |
---|---|---|---|---|
Broad-band | ||||
F105W | Wide Z | 1.050 | 0.3000 | 0.94 |
F110W | Wide J | 1.150 | 0.5000 | 0.96 |
F125W | J | 1.250 | 0.3000 | 0.94 |
F140W | J/H boundary | 1.40 | 0.4 | 0.95 |
F160W | H Short | 1.545 | 0.2900 | 0.94 |
Medium Band | ||||
F098M | Blue Grism Ref | 0.985 | 0.1700 | 0.92 |
F127M | Water/CH_4 continuum | 1.270 | 0.0700 | 0.88 |
F139M | Water/CH_4 line | 1.385 | 0.0700 | 0.87 |
F153M | H_20 and NH_3 | 1.530 | 0.0700 | 0.88 |
Narrow-band | ||||
F126N | FeII | 1.259 | 0.0126 | 0.86 |
F128N | Paschen b | 1.284 | 0.0128 | 0.90 |
F130N | Paschen b continuum | 1.301 | 0.0130 | 0.92 |
F132N | Redshifted Paschen b | 1.320 | 0.0132 | 0.81 |
F164N | Fe II | 1.646 | 0.0165 | 0.90 |
F167N | Fe II - continuum | 1.668 | 0.0167 | 0.91 |
Grisms | ||||
G102 | Blue High Res Grating | 0.95 | 0.2500 | 0.71 |
G141 | Red Low Res Grism | 1.40 | 0.6000 | 0.73 |
ISR 2012-01: Proposal 11923-UVIS Filter Wedge Check
E. Sabbi 05 Jan 2012
ISR 2010-12: Proposal 11913-IR Filter Wedge Check
Sabbi, MacKenty & Borders 24 Aug 2010
ISR 2010-04: Amplitude of fringing in WFC3/UVIS narrowband red filters
M. Wong 18 May 2010
ISR 2008-49: WFC3 TV3 Testing: Red Leak Checks for the UV Filters
T. Brown 11 Dec 2008
ISR 2008-08: WFC3 TV3 Testing: UVIS Filtered Throughput
T. Brown 30 Apr 2008
ISR 2007-24: WFC3 TV2 Testing: UVIS Filtered Throughput
T. Brown 26 Oct 2007
ISR 2007-09: UVIS Channel Filter Ghosts after Filter Replacement
T. Brown 25 Apr 2007
ISR 2007-02: Performance of the WFC3 Replacement IR Filters
S. Baggett, R. Boucarut, R. Telfer, J. Kim Quijano, M. Quijada 15 Feb 2007
ISR 2007-01: Performance of WFC3 Replacement UVIS Filters
S. Baggett, R. Boucarut, R. Telfer, J. Kim Quijano, M. Quijada 17 Jan 2007
Replacing the F093W Filter with the F140W
(WFC3-2006-04, 427Kb PDF), T. Brown and S.Baggett, 25 Sept 2006.
Filter Throughputs for WFC3 SYNPHOT Support
(WFC3-2006-03, 1970Kb PDF), T. Brown, 21 Sept 2006.
WFC3 IR Filters: Measured Throughput and Comparison to Specifications
(WFC3-2003-07, 672Kb PDF), O.Lupie, R.Boucarut, T.Pham, M.Quijada. July 2003.
WFC3 UVIS Filters: Measured Throughput and Comparison to Specifications
(WFC3-2003-02, 141Kb PDF), O.Lupie, R.Boucarut. 11 Feb 2003.
Wide Field Camera #3 IR and UVIS Filter Wheel Slot Assignments
(WFC3-2002-10, 389Kb PDF), O. Lupie. 30 Jun 2002.
WFC3 H Band Filter Optimization
(WFC3-2001-13, 455Kb PDF), O. Lupie. 20 Aug 2001.
ISR 2000-09: Wide Field Camera #3 Filter Selection Process - Part III: WFC3 IR Filter Requirements
O. Lupie, R. Boucarut 21 Aug 2000
ISR 2000-08: Wide Field Camera #3 Filter Selection Process - Part II: Compendium of Community Input
O. Lupie, C. Hanley, J. Nelan 12 May 2000
ISR 2000-07: Wide Field Camera #3 Filter Selection Process - Part I: HST Historical Filter Usage
O. Lupie, C. Hanley 13 Apr 2000