F25NDQ - NUV-MAMA

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Description

The F25NDQ mode with the NUV-MAMA detector provides broad-band imaging with attenuation factors that vary between 10-1 and 10-4 with respect to similar broad-band imaging filters (e.g., 25MAMA, F25QTZ). The full field of view is 25 arcsec × 25 arcsec, but the F25NDQ filter is unique in that it is divided into four quadrants, each having a different neutral density factor. Thus, the field of view for each quadrant is 12 arcsec × 12 arcsec. 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 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 13.83), so observers for whom the exact locations of the quadrant boundaries are important should consult the Help Desk.


Aperture

Pivot λ (Å)

FWHM (Å)

AB mag zero point

Speak

Bλ

R80 (arcsec)

Flux in 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

λ

F25NDQ1

F25NDQ2

F25NDQ3

F25NDQ4

F25NDQ1

F25NDQ2

F25NDQ3

F25NDQ4

1200

3.67e+11

5.89e+10

4.88e+09

2.39e+08

1.32e-02

2.12e-03

1.76e-04

8.60e-06

1300

1.31e+12

1.77e+11

1.43e+10

1.02e+09

4.41e-02

5.94e-03

4.82e-04

3.44e-05

1400

2.47e+12

3.10e+11

2.36e+10

2.19e+09

7.74e-02

9.68e-03

8.37e-04

6.85e-05

1500

3.51e+12

4.40e+11

3.88e+10

3.30e+09

1.03e-01

1.29e-02

1.14e-03

9.66e-05

1600

4.11e+12

5.01e+11

4.36e+10

3.96e+09

1.13e-01

1.37e-02

1.20e-03

1.09e-04

1700

4.63e+12

5.44e+11

4.63e+10

4.49e+09

1.19e-01

1.40e-02

1.20e-03

1.16e-04

1800

5.29e+12

6.40e+11

5.46e+10

5.28e+09

1.29e-01

1.56e-02

1.33e-03

1.29e-04

1900

6.61e+12

7.50e+11

6.66e+10

6.02e+09

1.53e-01

1.73e-02

1.54e-03

1.39e-04

2000

8.77e+12

9.27e+11

8.26e+10

6.57e+09

1.92e-01

2.03e-02

1.81e-03

1.44e-04

2100

1.11e+13

1.15e+12

9.97e+10

6.79e+09

2.32e-01

2.41e-02

2.08e-03

1.42e-04

2200

1.30e+13

1.37e+12

1.21e+11

7.47e+09

2.60e-01

2.73e-02

2.41e-03

1.49e-04

2300

1.41e+13

1.53e+12

1.45e+11

9.04e+09

2.69e-01

2.91e-02

2.76e-03

1.72e-04

2400

1.48e+13

1.69e+12

1.73e+11

1.17e+10

2.71e-01

3.10e-02

3.17e-03

2.13e-04

2500

1.56e+13

1.91e+12

2.10e+11

1.56e+10

2.75e-01

3.35e-02

3.68e-03

2.73e-04

2600

1.67e+13

2.18e+12

2.60e+11

2.10e+10

2.82e-01

3.69e-02

4.39e-03

3.54e-04

2700

1.72e+13

2.44e+12

3.16e+11

2.71e+10

2.80e-01

3.96e-02

5.41e-03

4.41e-04

2800

1.72e+13

2.60e+12

3.62e+11

3.33e+10

2.69e-01

4.07e-02

5.67e-03

5.23e-04

2900

1.47e+13

2.19e+12

3.20e+11

3.39e+10

2.23e-01

3.32e-02

4.85e-03

5.13e-04

3000

1.18e+13

1.68e+12

2.45e+11

3.06e+10

1.74e-01

2.46e-02

3.59e-03

4.49e-04

3100

6.12e+12

8.23e+11

1.20e+11

1.72e+10

8.68e-02

1.17e-02

1.70e-03

2.44e-04

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