12.5.1 WFC3 UVIS Spectral Elements
There are many spectral elements (filters and grism) allowed for HST's WFC3/UVIS. This article provides a list of those spectral elements for the Astronomer's Proposal Tool (APT). |
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Format definitions
Boldface type indicates the name of an APT parameter or a value for a parameter.
Black text indicates an important note.
Magenta text indicates available but unsupported parameters (requires prior approval from STScI).
Red text indicates restricted parameters (for STScI use only).
Brown text indicates text file parameters.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
The UVIS channel has 12 filter wheels with four spectral elements each. Only one spectral element may be specified for an exposure.
The quadrant filters pass light in four discrete bands in different quadrants of the detector. These may be selected just like any other filter, but the selected filter will only produce data in one quadrant of the detector. Exposures with a quad filter must be done with the UVIS-QUAD, UVIS-QUAD-FIX or UVIS-QUAD-SUB aperture. Use of the first two apertures will result in the read out of data from all four quad filters in the slot while the last aperture will result in the read out of only the quadrant of the quad filter specified.
Table 12.22: Spectral Elements for use with WFC3/UVIS
Name | Wheel | Position | Pivot1 Wavelength (Å) | Effective Width2 (Å) | Description |
F200LP | 2 | 3 | 5686.9 | (6500) | Clear; grism reference |
F218W | 3 | 1 | 2183.0 | 351.7 | ISM feature |
F225W | 3 | 2 | 2341.0 | 547.3 | UV Wide |
F275W | 9 | 1 | 2715.3 | 480.8 | UV Wide |
F280N | 4 | 2 | 2796.8 | 22.9 | MgII 2795/2802 |
F300X | 1 | 2 | 2829.8 | 753.0 | Extremely wide UV |
F336W | 4 | 1 | 3361.1 | 553.8 | U, Stromgren u |
F343N | 4 | 3 | 3438.0 | 140.0 | [NeV] 3426 |
F350LP | 11 | 2 | 6812.0 | (4500) | Long Pass |
F373N | 9 | 4 | 3729.6 | 39.2 | [OII] 3726/3728 |
F390M | 8 | 1 | 3893.8 | 210.5 | CaII continuum |
F390W | 11 | 1 | 3904.6 | 953.0 | Washington C |
F395N | 10 | 4 | 3953.7 | 72.9 | CaII H&K (3933/3968) |
F410M | 9 | 2 | 4107.0 | 182.8 | Stromgren ν |
F438W | 10 | 1 | 4318.7 | 676.8 | WFPC2 B |
F467M | 9 | 3 | 4680.7 | 218.0 | Stromgren b |
F469N | 3 | 4 | 4687.5 | 37.2 | HeII 4686 |
F475W | 6 | 1 | 4760.6 | 1488.9 | SDSS g' |
F475X | 10 | 3 | 4917.1 | 2199.6 | Extremely wide blue |
F487N | 2 | 1 | 4870.7 | 48.4 | Hβ4861 |
F502N | 2 | 2 | 5009.0 | 57.8 | [OIII] 5007 |
F547M | 8 | 2 | 5447.0 | 714.0 | Stromgren y |
F555W | 7 | 1 | 5309.8 | 1595.1 | WFPC2 V |
F600LP | 6 | 3 | 8430.2 | (4000) | Long Pass |
F606W | 6 | 2 | 5907.0 | 2304.2 | WFPC2 Wide V |
F621M | 8 | 3 | 6216.7 | 631.0 | 11% passband |
F625W | 5 | 1 | 6254.0 | 1575.4 | SDSS r' |
F631N | 1 | 3 | 6303.0 | 43.1 | [OI] 6300 |
F645N | 4 | 4 | 6451.6 | 85.0 | Continuum |
F656N | 1 | 4 | 6561.1 | 13.9 | Hα 6563 |
F657N | 3 | 3 | 6565.1 | 96.3 | Wide (Hα +[NII]) |
F658N | 11 | 3 | 6585.2 | 23.6 | [NII] 6583 |
F665N | 5 | 2 | 6654.4 | 109.0 | z (Hα + [NII]) |
F673N | 5 | 3 | 6764.5 | 100.5 | [SII] 6717/6731 |
F680N | 5 | 4 | 6878.6 | 323.6 | z (Hα + [NII]) |
F689M | 7 | 4 | 6886.0 | 708.6 | 11% passband |
F763M | 8 | 4 | 7636.3 | 798.6 | 11% passband |
F775W | 10 | 2 | 7733.6 | 1486.0 | SDSS i' |
F814W | 7 | 2 | 8304.7 | 2543.3 | WFPC2 Wide I |
F845M | 6 | 4 | 8468.9 | 886.7 | 11% passband |
F850LP | 7 | 3 | 9756.4 | (1500) | SDSS z' |
F953N | 2 | 4 | 9529.7 | 84.6 | [SIII] 9532 |
| Quadrant Filters (Readout Amplifier included in the Position) | |||||
FQ232N | 12 | 1C | 2326.9 | 32.2 | CII] 2326 |
FQ243N | 12 | 1D | 2420.6 | 34.8 | [Ne IV] 2425 |
FQ378N | 12 | 1B | 3790.9 | 89.2 | z ([OII] 3726) |
FQ387N | 12 | 2A | 3873.0 | 23.1 | [NeIII]3868 |
FQ422M | 12 | 2C | 4217.7 | 113.3 | Blue Continuum |
FQ436N | 12 | 2D | 4366.7 | 35.7 | [OIII] 4363 + Hγ 4340 |
FQ437N | 12 | 1A | 4370.6 | 24.6 | [OIII] 4363 |
FQ492N | 12 | 2B | 4932.1 | 101.0 | z (Hβ) |
FQ508N | 11 | 4A | 5089.7 | 117.9 | z ([OIII] 5007) |
FQ575N | 11 | 4C | 5755.9 | 12.9 | [NII] 5754 |
FQ619N | 12 | 4A | 6197.5 | 61.6 | CH4 6194 |
FQ634N | 12 | 4C | 6347.5 | 66.2 | 6194 continuum |
FQ672N | 11 | 4D | 6716.1 | 14.9 | [SII] 6717 |
FQ674N | 11 | 4B | 6729.5 | 10.0 | [SII] 6731 |
FQ727N | 12 | 4D | 7274.7 | 64.8 | CH4 7270 |
FQ750N | 12 | 4B | 7500.6 | 68.8 | 7270 continuum |
FQ889N | 12 | 3A | 8891.8 | 93.7 | CH4 25 km-agt3 |
FQ906N | 12 | 3C | 9056.7 | 94.0 | CH4 2.5 km-agt |
FQ924N | 12 | 3D | 9246.3 | 89.2 | CH4 0.25 km-agt |
FQ937N | 12 | 3B | 9371.1 | 91.9 | CH4 0.025 km-agt |
| UV Grism | |||||
G280 | 1 | 1 | (2775) | 1850 | UV grism |
1“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.
2Full 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.
3km-agt (km-amagat) is a unit of vertical column density, equal to 2.69 × 1024 molecules/cm2