grnd perf

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.

Longpass filters
Wide filters 1
Wide filters 2
Medium filters
Narrow filters 1
Narrow filters 2
Narrow filters 3

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.

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.

Wide filters 1
Wide filters 2
Medium filters
Narrow 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.

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