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Tabular Reference Data
Space Telescope Science Institute
Cycle 21 Phase II Proposal Instructions
help@stsci.edu
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Chapter 11: Advanced Camerafor Surveys (ACS) > 11.4 Tabular Reference Data
11.4 Tabular Reference Data
11.4.1 Spectral Elements for WFC
11.4.2 Permitted Filter Combinations
11.4.3 Ramp Filter Wavelength Ranges
11.4.4 Spectral Elements for ACS/SBC
11.4.5 Allowed Combinations of Aperture, Spectral Element & Readout
11.4.1 Spectral Elements for WFC
Table 11.2: Spectral Elements for use with ACS/WFC Configurationa
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 deg
ACS/WFC
1
9
POL60UV
UV polarizer 60 deg
ACS/WFC
1
10
POL120UV
UV polarizer 120 deg
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
Hα
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
Hα ramp
ACS/WFC
2
6
FR716N
Hα ramp
ACS/WFC
2
6
FR782N
Hα ramp
ACS/WFC
2
8
POL0V
visible polarizer 0 deg
ACS/WFC
2
10
POL60V
visible polarizer 60 deg
ACS/WFC
2
12
POL120V
visible polarizer 120 deg
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
a. Note: 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 11.4). The visible polarizers (POL0V, POL60V, POL120V) must be used with a spectral element on wheel 1 except for: F850LP, F892N, POL0UV, POL60UV, and POL120UV.
11.4.2 Permitted Filter Combinations
Only a subset of possible combinations of spectral elements are permitted. In the following tables, an "S" indicates combinations that are supported. Combinations marked with "O" are permitted ONLY for Mode = ACQ exposures and are intended for use with bright targets.
Table 11.3: Permitted WFC filter combinations for Mode = ACCUM
 
Filter Wheel 1 Spectral Element
F555W
F775W
F625W
F550M
F850LP
POL0UV
POL60UV
POL120UV
F892N
F606W
F502N
G800L
F658N
F475W
 
Filter Wheel 2 Spectral Element
F660N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
F814W
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR388N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR423N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR462N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
F435W
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR656N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR716N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR782N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
POL0V
 
S
 
 
 
 
 
 
 
S
 
 
 
S
 
POL60V
 
S
 
 
 
 
 
 
 
S
 
 
 
S
 
POL120V
 
S
 
 
 
 
 
 
 
S
 
 
 
S
 
PR200L
 
 
 
 
 
 
 
 
 
 
 
 
 
 
F344N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR914M
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR853N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR931N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR459M
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR647M
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR1016N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR505N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR551N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FR601N
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
11.4.3 Ramp Filter Wavelength Ranges
Table 11.4: Wavelength Ranges for the WFCRamp Filters
Name
Minimum Wavelength (е)
Maximum Wavelength (е)
WFC FOV location
FR388N
3710
4049
middle
FR423N
4049
4420
inner
FR462N
4420
4824
outer
FR505N
4824
5266
middle
FR551N
5266
5748
inner
FR601N
5748
6274
outer
FR656N
6274
6848
middle
FR716N
6848
7474
inner
FR782N
7474
8158
outer
FR853N
8158
8905
inner
FR931N
8905
9719
outer
FR1016N
9719
10609
outer
FR459M
3810
5366
middle
FR647M
5366
7574
inner
FR914M
7574
10709
middle
11.4.4 Spectral Elements for ACS/SBC
Table 11.5: Spectral Elements for use with the ACS/SBC Configuration
Wheel
Position
Name
Description
3
2
F115LP
MgF2
3
3
F125LP
CaF2
3
5
F140LP
BaF2
3
6
F150LP
crystal quartz
3
8
F165LP
Suprasil
3
9
F122M
Ly-α
3
11
PR130L
CaF2 PRISM
3
12
PR110L
LiF2 PRISM
11.4.5 Allowed Combinations of Aperture, Spectral Element & Readout
Table 11.6: Allowed Aperture, Spectral Element & Readout Combinations
Aperture
Allowed Spectral Elements1
Readout
WFC
F S
full frame2
WFC-FIX
F
full frame
WFC1
F S
full frame2
WFC1-FIX
F
full frame
WFC2
F S
full frame2
WFC2-FIX
F
full frame
WFCENTER
F
full frame
WFC1-CTE
F
full frame
WFC1-512
F
subarray fixed by STScI
WFC1-1K
F
subarray fixed by STScI
WFC1-2K
F
subarray fixed by STScI
WFC1-IRAMP
F I
full frame
WFC1-MRAMP
F M S
full frame
WFC2-MRAMP
F M S
full frame
WFC2-ORAMP
F O
full frame
WFC1-IRAMPQ
F I
subarray fixed by STScI
WFC1-MRAMPQ
F M S
subarray fixed by STScI
WFC2-ORAMPQ
F O
subarray fixed by STScI
1
F = normal WFC filters and G800L
 S = small elements (polarizers and F892N)
I = inner ramp filter segments
M = middle ramp filter segments
O = outer ramp filter segments

2
A subarray fixed by STScI will apply to WFC, WFC1, WFC2 when a small spectral element (polarizer of F892N) is selected.

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