CCD Clear Imaging - 50CCD

Description

The 50CCD mode is very sensitive for broad-band optical imaging. For a fixed exposure time, the ACS WFC with the F606W or F814W will be a better choice for most users.

Recommended Uses

Recommended for deep imaging where detailed color information is not needed. In most cases the ACS WFC will be a better choice.

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

5754.1

4333.0

26.295

2.03e+15

4930.6

0.16

14%

Figure 14.1: Throughput for 50CCD



Table 14.2: 50CCD Sensitivity & Throughput

λ

Sensitivity

% Throughput

2400.

1.41E14

2.59

2800.

1.97E14

3.08

3200.

3.64E14

4.99

3600.

5.01E14

6.05

4000.

9.33E14

10.24

4200.

1.15E15

12.00

4400.

1.30E15

12.98

4600.

1.41E15

13.44

4800.

1.51E15

13.83

5000.

1.60E15

14.06

5200.

1.68E15

14.21

5400.

1.79E15

14.52

5600.

1.88E15

14.74

5800.

1.94E15

14.68

6000.

1.98E15

14.50

6200.

2.01E15

14.26

6400.

2.03E15

13.93

6600.

2.02E15

13.45

6800.

1.99E15

12.84

7000.

1.94E15

12.16

7200.

1.88E15

11.45

7400.

1.81E15

10.76

7600.

1.73E15

9.99

7800.

1.60E15

9.02

8000.

1.46E15

7.99

8200.

1.33E15

7.12

8400.

1.23E15

6.41

8600.

1.17E15

5.98

9000.

1.14E15

5.55

9400.

1.06E15

4.96

9800.

7.95E14

3.56

10200.

3.93E14

1.69

Figure 14.2: Point Source S/N vs. V+ABν for the 50CCD filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).


Figure 14.3: Extended Source S/N vs. V+ABν for the 50CCD 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

1.614e-02

0.321

1.5

0.075

7.765e-03

0.495

2

0.100

4.320e-03

0.621

3

0.150

1.629e-03

0.787

4

0.200

4.904e-04

0.868

5

0.250

1.978e-04

0.902

10

0.500

2.499e-05

0.964

15

0.750

7.654e-06

0.986

20

1.000

2.687e-06

0.996

Figure 14.4: Point Source PSF for 50CCD, 7."5 square (at pixel 518,517, log scaled, B-V=-0.25).


Figure 14.5: Point Source Encircled Energy for 50CCD


Figure 14.6: Point Source Intensity vs. Radius for 50CCD