WFC3IR Minimum Exposure Times and Subarrays

The WFC3/IR imaging and spectroscopy ETC assume full frame for the WFC3 IR calculations. The minimum exposure time warnings are triggered assuming a full frame observation. IR subarrays have shorter minimum exposure times and users should check the WFC3 Instrument Handbook for specific information. See http://www.stsci.edu/hst/wfc3/documents/handbooks/currentIHB/c07_ir08.html#374740

WFC3 Filters and Dispersers

The following tables show the filter and disperser properties.

WFC3 UVIS Filters and Grism

Name [1] Description [2] Pivot (A) [3] Width (A) [4] Peak Transmission
UVIS Long-Pass (LP) and Extremely Wide (X) Filters
F200LP Clear; grism reference 5686.9
0.98
F300X Extremely wide UV 2829.8 753.0 0.53
F350LP Long pass 6812.0
0.98
F475X Extremely wide blue 4917.1 2199.6 0.94
F600LP Long pass 8430.2
0.99
F850LP SDSS z 9756.4
0.96
UVIS Wide-Band(W) Filters
F218W ISM feature 2183.0 351.7 0.23
F225W UV wide 2341.0 547.3 0.32
F275W UV wide 2715.3 480.8 0.46
F336W U, Stromgren u 3361.1 553.8 0.75
F390W Washington C 3904.6 953.0 0.96
F438W WFPC2 B 4318.7 676.8 0.84
F475W SDSS g 4760.6 1488.9 0.92
F555W WFPC2 V 5309.8 1595.1 0.95
F606W WFPC2 Wide V 5907.0 2304.2 0.99
F625W SDSS r 6254.0 1575.4 0.95
F775W SDSS i 7733.6 1486.0 0.85
F814W WFPC2 Wide I 8304.7 2543.3 0.97
UVIS Medium-Band (M) Filters
F390M Ca II continuum 3893.8 210.5 0.88
F410M Stromgren v 4107.0 182.8 0.98
FQ422M Blue continuum 4217.7 113.3 0.69
F467M Stromgren b 4680.7 218.0 0.98
F547M Stromgren y 5447.0 714.0 0.88
F621M 11% passband 6216.7 631.0 0.99
F689M 11% passband 6886.0 708.6 0.94
F763M 11% passband 7636.3 798.6 0.97
F845M 11% passband 8468.9 886.7 0.96
UVIS Narrow-Band (N) Filters
FQ232N C II] 2326 2326.9 32.2 0.12
FQ243N [Ne IV] 2425 2420.6 34.8 0.15
F280N Mg II 2795/2802 2796.8 22.9 0.27
F343N [Ne V] 3426 3438.0 140.0 0.78
F373N [O II] 3726/3728 3729.6 39.2 0.78
FQ378N z ([O II] 3726) 3790.9 89.2 0.83
FQ387N [Ne III] 3868 3873.0 23.1 0.72
F395N Ca II 3933/3968 3953.7 72.9 0.86
FQ436N H 4340 + [O III] 4363 4366.7 35.7 0.67
FQ437N [O III] 4363 4370.6 24.6 0.70
F469N He II 4686 4687.5 37.2 0.69
F487N H 4861 4870.7 48.4 0.85
FQ492N z (H) 4932.1 101.0 0.85
F502N [O III] 5007 5009.0 57.8 0.87
FQ508N z ([O III] 5007) 5089.7 117.9 0.87
FQ575N [N II] 5754 5755.9 12.9 0.78
FQ619N CH4 6194 6197.5 61.6 0.89
F631N [O I] 6300 6303.0 43.1 0.86
FQ634N 6194 continuum 6347.5 66.2 0.88
F645N Continuum 6451.6 85.0 0.86
F656N H 6562 6561.1 13.9 0.86
F657N Wide H + [N II] 6565.1 96.3 0.90
F658N [N II] 6583 6585.2 23.6 0.92
F665N z (H + [N II]) 6654.4 109.0 0.90
FQ672N [S II] 6717 6716.1 14.9 0.89
F673N [S II] 6717/6731 6764.5 100.5 0.91
FQ674N [S II] 6731 6729.5 10.0 0.68
F680N z (H + [N II]) 6878.6 323.6 0.95
FQ727N CH4 7270 7274.7 64.8 0.89
FQ750N 7270 continuum 7500.6 68.8 0.85
FQ889N CH4 25 km-agt [5] 8891.8 93.7 0.90
FQ906N CH4 2.5 km-agt 9056.7 94.0 0.92
FQ924N CH4 0.25 km-agt 9246.3 89.2 0.94
FQ937N CH4 0.025 km-agt 9371.1 91.9 0.91
F953N [S III] 9532 9529.7 84.6 0.90
UVIS Grism (G)
G280 UV Grism
1850 0.4
[1]The spectral-element naming convention is as follows for both the UVIS and IR channels. All filter names begin with F, and grisms with G; if the filter is part of a four-element quad mosaic, a Q follows F. Then there is a three-digit number giving the nominal effective wavelength of the bandpass, in nm (UVIS channel) or nm/10 (IR channel). (For long-pass filters, the number is instead the nominal blue cut-off wavelength in nm.) Finally, for the filters, one or two letters indicate the bandpass width: X (extremely wide), LP (long pass), W (wide), M (medium), or N (narrow).
[2]Filters intended for imaging in a red-shifted bandpass are given descriptions similar to the following: “z (H + [N II])”.
[3]“Pivot wavelength” is a measure of the effective wavelength of a filter (see A. Tokunaga & W. Vacca 2006, PASP, 117, 421). It is calculated here based only on the filter transmission. Values are approximate for the long-pass filters. All wavelength measurements in this table were made in air.
[4]Full width at 50% of peak transmission for wide and medium bands, and at 10% of peak transmission for narrow bands. For long-pass filters, the widths are approximate and include convolution with the detector QE.
[5]km-agt (km-amagat) is a unit of vertical column density, equal to 2.69e24 molecules/cm^2

WFC3 IR Channel Filters and Grisms

Name [6] Description Pivot [7] (nm) Width [8] (nm) Peak Transmission
IR Wide-Band(W) Filters
F105W Wide Y 1048.95 292.30 0.98
F110W Wide YJ 1141.40 503.40 0.99
F125W Wide J 1245.90 301.50 0.98
F140W Wide JH gap; red grism reference 1392.10 399.00 0.99
F160W WFC3 H 1540.52 287.88 0.98
IR Medium-Band(M) Filters
F098M Blue grism reference 982.93 169.48 0.97
F127M H2O/CH4 continuum 1273.64 68.79 0.98
F139M H2O/CH4 line 1383.80 64.58 0.98
F153M H2O and NH3 1533.31 68.78 0.98
IR Narrow-Band(N) Filters
F126N [Fe II] 1258.26 11.83 0.90
F128N Paschen 1283.30 13.54 0.94
F130N Paschen continuum 1300.62 13.28 0.96
F132N Paschen (redshifted) 1319.04 13.07 0.91
F164N [Fe II] 1645.13 17.48 0.93
F167N [Fe II] continuum 1667.26 17.16 0.93
IR Grisms (G)
G102 “Blue” high-resolution grism
250
G141 “Red” low-resolution grism
600
[6]See Footnote 1 of UVIS table for naming conventions.
[7]“Pivot wavelength” is defined as in Table 6.2. All wavelength measurements in this table were made in air.
[8]Full width at 50% of peak transmission.