CCD Clear Imaging-50CCD

Description

The 50CCD mode is very sensitive for broad-band optical imaging. For a fixed exposure time, it can detect point sources roughly 0.8 mag fainter than with WFPC2 with the F606W filter. However, 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 7.1.7)

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Pivot (Å)	FWHM (Å)	AB mag zeropoint	Speak	B	R80 (arcsec)	Flux in central pixel
5851.5	4410.3	26.386		4898.9	0.16	14%

Figure 14.1: Throughput for 50CCD

Table 14.2: Throughputs and Sensitivities for 50CCD

	Sensitivity	Throughput %
2500.	1.69E14	2.97
3000.	2.85E14	4.17
3500.	4.70E14	5.89
4000.	9.43E14	10.34
4500.	1.39E15	13.58
5000.	1.64E15	14.41
5500.	1.85E15	14.74
6000.	1.99E15	14.52
6500.	2.04E15	13.75
7000.	1.94E15	12.18
7500.	1.78E15	10.40
8000.	1.43E15	7.85
8500.	1.18E15	6.09
9000.	1.13E15	5.50
9500.	1.02E15	4.72
10000.	6.00E14	2.63
10500.	1.60E14	0.67

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

Figure 14.3: Extended Source S/N vs. V+AB 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 (sec).

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