10.5.1 ACS WFC Spectral Elements
There are many spectral elements (filters and polarizers) allowed for HST's ACS/WFC. This article provides a list of those spectral elements for the Astronomer’s Proposal Tool (APT). |
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Table 10.3: Spectral Elements for use with ACS/WFC Configuration1
Wheel | Position | Name | Description | Allowed Configurations |
---|---|---|---|---|
1 | 2 | F555W | Johnson V | ACS/WFC |
1 | 3 | F775W | SDSS i | ACS/WFC |
1 | 4 | F625W | SDSS r | ACS/WFC |
1 | 5 | F550M | narrow V | ACS/WFC |
1 | 6 | F850LP | SDSS z | ACS/WFC |
1 | 8 | POL0UV | UV polarizer 0° | ACS/WFC |
1 | 9 | POL60UV | UV polarizer 60° | ACS/WFC |
1 | 10 | POL120UV | UV polarizer 120° | ACS/WFC |
1 | 11 | F892N | methane | ACS/WFC |
1 | 12 | F606W | broad V | ACS/WFC |
1 | 13 | F502N | O III | ACS/WFC |
1 | 14 | G800L | GRISM | ACS/WFC |
1 | 15 | F658N | Ha | ACS/WFC |
1 | 16 | F475W | SDSS g | ACS/WFC |
2 | 2 | F660N | N II | ACS/WFC |
2 | 3 | F814W | Johnson I | ACS/WFC |
2 | 4 | FR388N | O II Ramp | ACS/WFC |
2 | 4 | FR423N | O II Ramp | ACS/WFC |
2 | 4 | FR462N | O II Ramp | ACS/WFC |
2 | 5 | F435W | Johnson B | ACS/WFC |
2 | 6 | FR656N | Ha ramp | ACS/WFC |
2 | 6 | FR716N | Ha ramp | ACS/WFC |
2 | 6 | FR782N | Ha ramp | ACS/WFC |
2 | 8 | POL0V | visible polarizer 0° | ACS/WFC |
2 | 10 | POL60V | visible polarizer 60° | ACS/WFC |
2 | 12 | POL120V | visible polarizer 120° | ACS/WFC |
2 | 16 | FR914M | Broad Ramp | ACS/WFC |
2 | 16 | FR853N | IR Ramp | ACS/WFC |
2 | 16 | FR931N | IR Ramp | ACS/WFC |
2 | 17 | FR459M | Broad Ramp | ACS/WFC |
2 | 17 | FR647M | Broad Ramp | ACS/WFC |
2 | 17 | FR1016N | IR Ramp | ACS/WFC |
2 | 18 | FR505N | O III Ramp | ACS/WFC |
2 | 18 | FR551N | O III Ramp | ACS/WFC |
2 | 18 | FR601N | O III Ramp | ACS/WFC |
1For available but unsupported parameters (CLEAR)
Normally only one spectral element may be specified for an exposure. The exceptions are:
The polarizers must be used with another spectral element. This is required to maintain focus. The UV polarizers (POL0UV, POL60UV, POL120UV) must be used with a spectral element on wheel 2 except for: POL0V, POL60V, POL120V, and any inner or outer ramp filter segment (see Table 10.5: Wavelength Ranges for the WFC Ramp Filters. The visible polarizers (POL0V, POL60V, POL120V) must be used with a spectral element on wheel 1 except for: F850LP, F892N, POL0UV, POL60UV, and POL120UV.
For restricted parameters
Related Links
10.5.2 ACS WFC Permitted Filter Combinations
10.5.3 ACS WFC Ramp Filter Ranges
10.5.4 ACS WFC Allowed Combinations of Aperture, Spectral Element, and Readout
10.5.5 ACS SBC Spectral Elements
10.5.6 ACS Aperture Coordinate System