12.5.2 WFC3 IR Spectral Elements
There are many spectral elements (filters and grisms) allowed for HST's WFC3/IR. 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 IR channel has a single filter wheel with 17 spectral elements and one blank element. Only one spectral element may be specified for an exposure.
Table 12.23: Spectral Elements for use with WFC3/IR
Name | Position | Pivot1 Wavelength (nm) | Effective Width2 (nm) | Description |
F098M | 6 | 982.93 | 169.48 | Blue grism reference |
F105W | 5 | 1048.95 | 292.30 | Wide Y |
F110W | 4 | 1141.40 | 503.40 | Wide YJ |
F125W | 2 | 1245.90 | 301.50 | Wide J |
F126N | 15 | 1258.26 | 11.83 | [FeII] |
F127M | 11 | 1273.64 | 68.79 | H2O/CH4 continuum |
F128N | 12 | 1283.30 | 13.54 | Paschenβ |
F130N | 13 | 1300.62 | 13.28 | Paschenβ continuum |
F132N | 14 | 1319.04 | 13.07 | Paschenβ (redshifted) |
F139M | 10 | 1383.80 | 64.58 | H2O/CH4 line |
F140W | 8 | 1392.10 | 399.00 | Wide JH gap; red grism reference |
F153M | 9 | 1533.31 | 68.78 | H2O and NH3 |
F160W | 1 | 1540.52 | 287.88 | WFC3 H |
F164N | 17 | 1645.13 | 17.48 | [FeII] |
F167N | 16 | 1667.26 | 17.16 | [FeII] continuum |
G102 | 7 | (1025) | 250 | Blue high-resolution grism |
G141 | 3 | (1410) | 600 | Red low-resolution grism |
BLANK (restricted) | 0 | N/A | N/A | Blank (opaque) |
1“Pivot wavelength” is defined in Table 12.22: Spectral Elements for use with WFC3/UVIS. All wavelength measurements in this table were made in air.
2Full width at 50% of peak transmission.