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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 14

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F25NDQ - NUV-MAMA

Description

The F25NDQ mode with the NUV-MAMA detector provides broad band imaging with attenuation factors varying between 10-1 and 10-4. The full field of view is 25 X 25 arcsec, but the F25NDQ filter is unique in that it is divided into four quadrants, each having a different neutral density factor. In clockwise order starting from the upper left these are F25NDQ1, F25NDQ2, F25NDQ3, and F25NDQ4, where the number appended to each name is the approximate dex ND factor. The R80 and central pixel flux are unmeasured but assumed to be approximately the same as produced by the F25SRF2 filter.

Recommended Uses

Recommended for broad-band imaging of bright objects which require attenuation of between 10-1 and 10-4 to meet NUV-MAMA bright-object limits.

Special Considerations

If a target would violate BOP restrictions in any quadrant of the F25NDQ aperture, the restrictions regarding pointing close to objects violating safety limits discussed in Chapter 7 and STIS ISR 2000-01 will apply. Also the dividing lines between the quadrants are somewhat displaced from the center of the detector and are not quite parallel to the detector edges (see Figure 13.82), so observers for whom the exact locations of the quadrant boundaries are important should consult help@stsci.edu.

Aperture
pivot
FWHM
AB mag
zeropoint
Speak
B
R80
Flux central
pixel
F25NDQ1
2277.46
1126
21.583
1.86e+13
1263
0.32
8%
F25NDQ2
2318.08
1036
19.326
2.82e+12
1098
0.32
8%
F25NDQ3
2417.84
756
16.906
3.92e+11
889
0.32
8%
F25NDQ4
2450.14
607
14.207
3.63e+10
814
0.32
8%

Figure 14.34: F25NDQ Integrated System Througputs.


 

Table 14.14: Throughputs and Sensitivities for F25NDQ NUV-MAMA quadrants.
Sensitivities
 
Throughputs
F25NDQ1
F25NDQ2
F25NDQ3
F25NDQ4
 
F25NDQ1
F25NDQ2
F25NDQ3
F25NDQ4
1200
4.51e+11
7.44e+10
6.39e+09
2.77e+08
1.65e-02
2.73e-03
2.34e-04
1.02e-05
1300
1.83e+12
2.48e+11
1.99e+10
1.41e+09
6.19e-02
8.39e-03
6.73e-04
4.79e-05
1400
3.10e+12
3.87e+11
3.35e+10
2.75e+09
9.73e-02
1.22e-02
1.05e-03
8.65e-05
1500
3.88e+12
4.88e+11
4.31e+10
3.65e+09
1.14e-01
1.43e-02
1.26e-03
1.07e-04
1600
4.19e+12
5.12e+11
4.46e+10
4.05e+09
1.15e-01
1.41e-02
1.23e-03
1.11e-04
1700
4.56e+12
5.32e+11
4.53e+10
4.40e+09
1.18e-01
1.38e-02
1.17e-03
1.14e-04
1800
4.95e+12
6.03e+11
5.12e+10
4.97e+09
1.21e-01
1.47e-02
1.25e-03
1.22e-04
1900
6.43e+12
7.30e+11
6.50e+10
5.90e+09
1.49e-01
1.69e-02
1.51e-03
1.37e-04
2000
9.21e+12
9.73e+11
8.69e+10
6.94e+09
2.03e-01
2.14e-02
1.91e-03
1.53e-04
2100
1.21e+13
1.26e+12
1.08e+11
7.38e+09
2.54e-01
2.64e-02
2.27e-03
1.55e-04
2200
1.43e+13
1.50e+12
1.32e+11
8.11e+09
2.85e-01
3.00e-02
2.63e-03
1.62e-04
2300
1.54e+13
1.67e+12
1.58e+11
9.83e+09
2.95e-01
3.19e-02
3.02e-03
1.88e-04
2400
1.64e+13
1.88e+12
1.92e+11
1.29e+10
3.01e-01
3.45e-02
3.52e-03
2.37e-04
2500
1.72e+13
2.10e+12
2.30e+11
1.71e+10
3.03e-01
3.69e-02
4.05e-03
3.00e-04
2600
1.79e+13
2.34e+12
2.78e+11
2.24e+10
3.03e-01
3.96e-02
4.71e-03
3.80e-04
2700
1.83e+13
2.59e+12
3.36e+11
2.88e+10
2.98e-01
4.23e-02
5.47e-03
4.69e-04
2800
1.86e+13
2.82e+12
3.92e+11
3.61e+10
2.92e-01
4.44e-02
6.16e-03
5.67e-04
2900
1.56e+13
2.50e+12
3.70e+11
3.61e+10
2.37e-01
3.79e-02
5.61e-03
5.48e-04
3000
1.33e+13
2.21e+12
3.41e+11
3.47e+10
1.95e-01
3.24e-02
5.01e-03
5.08e-04
3100
6.31e+12
1.07e+12
1.72e+11
1.78e+10
8.95e-02
1.52e-02
2.44e-03
2.53e-04

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