CCD Long-Pass Imaging F28X50LP

Description

The F28X50LP mode is useful for deep imaging longward of 5500 Å. The field of view is 28" × 50". The ACS/WFC with the F814W filter will be more appropriate for most programs.

Recommended Uses

Recommended for deep high-resolution imaging between 5500 Å and 10,000 Å. Default aperture for target acquisitions.

Special Considerations

Very red sources may show significant wings from detector halo (see Section 7.2.8).

Pivot λ (Å)

FWHM (Å)

AB mag zero point

Speak

Bλ

R80 (arcsec)

Flux in central pixel

7223.4

2693.2

25.266

1.76e+15

3486.8

0.15

14%

Figure 14.7: Throughput for F28X50LP




Table 14.4: F28X50LP Sensitivity & Throughput

λ

Sensitivity

% Throughput

5400.

2.38E14

1.93

5600.

1.19E15

9.32

5800.

1.49E15

11.30

6000.

1.67E15

12.23

6200.

1.70E15

12.05

6400.

1.74E15

11.95

6600.

1.75E15

11.61

6800.

1.66E15

10.71

7000.

1.69E15

10.58

7200.

1.64E15

10.01

7400.

1.60E15

9.47

7600.

1.44E15

8.33

7800.

1.40E15

7.89

8000.

1.28E15

7.04

8200.

1.18E15

6.29

8400.

1.10E15

5.76

8600.

1.00E15

5.11

8800.

1.01E15

5.03

9000.

1.01E15

4.93

9200.

9.76E14

4.66

9400.

9.46E14

4.42

9600.

8.74E14

4.00

9800.

7.19E14

3.22

10000.

5.25E14

2.30

Figure 14.8: Point Source S/N vs. V+ABν for the F28X50LP filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).


Figure 14.9: Extended Source S/N vs. V+ABν for the F28X50LP filter for gain=1. Top curves are for a source area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).



Table 14.3: Radial Profile for 50CCD

Radius


 

Fraction of Energy Encircled

Pixels

Arcsec

Intensity

1

0.050

1.703e-02

0.337

1.5

0.075

7.468e-03

0.512

2

0.100

4.196e-03

0.632

3

0.150

1.733e-03

0.804

4

0.200

4.246e-04

0.883

5

0.250

1.660e-04

0.911

10

0.500

2.469e-05

0.976

15

0.750

5.360e-06

0.996

19.25

0.963

3.333e-07

1.000

Figure 14.10: Point Source Encircled Energy for F28X50LP


Figure 14.11: Point Source Intensity vs. Radius for F28X50LP