Space Telescope Science Institute  CCD Long-Pass Imaging F28X50LP F28X50OII-CCD

F28X50OIII-CCD

Description

The F28X50OIII mode is useful for narrow-band imaging of O III 5007 Å. The narrow bandpass and high spatial resolution provides some advantages over WFPC2 with the F502N filter, though the spatial resolution is not as high as that of ACS/HRC and the F502N filter.

Recommended Uses

Recommended for deep high-resolution O III imaging.

Special Considerations

This filter has a significant red leak longward of 1 micron. Depending on the source spectrum, the contribution from redleak may swamp the contribution from line emission.

Pivot (Å)
FWHM (Å)
AB mag zeropoint
Speak
B
R80 (arcsec)
Flux in central pixel
5005.8
6.2
18.846
1.26e+15
6.3
0.13
17%

Figure 14.12: Throughput for F28x50OIII.

 

Table 14.6: Throughput and Sensitivity for F28X50OIII
l
Sensitivity
Throughput %
4999.
5.23E13
0.46
5000.
1.22E14
1.07
5001.
2.09E14
1.84
5002.
4.01E14
3.52
5003.
6.46E14
5.67
5004.
9.25E14
8.12
5005.
1.22E15
10.72
5006.
1.26E15
11.03
5007.
1.12E15
9.80
5008.
8.74E14
7.66
5009.
5.42E14
4.75
5010.
2.97E14
2.60
5011.
1.40E14
1.23
5012.
5.25E13
0.46
Figure 14.13: Point Source S/N vs. V+AB for the F28X50OIII filter.Top curves are for low sky; bottom curves are for average sky.

 
Figure 14.14: Extended Source S/N vs. V+AB for the F28X50OIII for gain=1. Top curves are for a source area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed.

 

Table 14.7: Radial Profile for F28X50OIII
Radius

Fraction of Energy Encircled
Pixels
Arcsec
Intensity
1
0.050
1.750e-02
0.358
2
0.075
9.783e-03
0.574
2
0.100
4.193e-03
0.711
3
0.150
8.194e-04
0.844
4
0.200
3.245e-04
0.884
5
0.250
2.403e-04
0.916
10
0.500
2.049e-05
0.979
15
0.750
4.391e-06
0.995
20
1.000
8.462e-07
1.000
Figure 14.15: Point Source PSF for F28X50OIII, 7."5 square (pixel 493,542, log scaled, B-V=-0.34)

 
Figure 14.16: Point Source Encircled Energy for F28X50OIII

 
Figure 14.17: Point Source Intensity vs. Radius for F28X50OIII

 
CCD Long-Pass Imaging F28X50LP F28X50OII-CCD
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