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WFC3 Filters

WFC3 contains a large compliment 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 SYNPHOT 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: UVIS, IR.

UVIS

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 (XLS, 41.0KB) are described in this Excel workbook.

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

Figures giving the total WFC3 system throughput, including the flight detector, optics and filters.

IR

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

Figures giving the total WFC3 system throughput, including the flight detector, optics and filters.

Relevant ISRs

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.