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, it is not expected to be as sensitive as the ACS+WFC and the clear aperture.

Recommended Uses.

Recommended for deep imaging where detailed color information is not needed.

Special Considerations

Very red sources may show significant wings from detector halo (see Optical Performance)

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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.	1.67E14	2.93
3000.	2.81E14	4.11
3500.	4.62E14	5.80
4000.	9.41E14	10.33
4500.	1.43E15	13.99
5000.	1.74E15	15.31
5500.	2.00E15	15.99
6000.	2.20E15	16.07
6500.	2.30E15	15.55
7000.	2.24E15	14.03
7500.	2.07E15	12.13
8000.	1.69E15	9.28
8500.	1.41E15	7.29
9000.	1.36E15	6.61
9500.	1.23E15	5.70
10000.	7.25E14	3.18
10500.	1.94E14	0.81

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.

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.

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