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Space Telescope Science Institute |
Cycle 20 Phase II Proposal Instructions |
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, and the image will contain data from all four quad filters in that slot. Exposures with a quad filter must be done with the UVIS-QUAD, UVIS-QUAD-FIX or UVIS-QUAD-SUB aperture.
Wavelength (е) Width2 (е) CaII H&K (3933/3968) WFPC2 B SDSS g' Hβ 4861 WFPC2 V SDSS r' Hα 6563 Wide (Hα +[NII]) z (Hα + [NII]) z (Hα + [NII]) SDSS i' SDSS z' [OIII] 4363 + Hγ 4340 z (Hβ) CH4 6194 CH4 7270 CH4 2.5 km-agt CH4 0.25 km-agt CH4 0.025 km-agt
“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.
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.
The IR channel has a single filter wheel with 17 spectral elements. Only one spectral element may be specified for an exposure.Table 13.6: Spectral Elements for use with WFC3/IR
Pivot1Wavelength (nm) Width2 (nm) Wide Y Wide YJ Wide J Paschenβ continuum Paschenβ (redshifted) Wide JH gap; red grism reference WFC3 H
“Pivot wavelength” is defined as in Table 13.5. All wavelength measurements in this table were made in air.