F28X50OII - CCD

Description

The F28X50OII mode is useful for narrow-band imaging of OII 3727 Å. The narrow bandpass may offer some advantages over the ACS WFC with the [O II] ramp filter. The field of view is 28" x 50".

Recommended Uses

Recommended for deep high-resolution O II imaging.

Special Considerations

This filter does not have a significant red leak. Flat field images taken through this filter show scattered light at the top and bottom of the frame. This is not expected to be a problem for astronomical targets.

Pivot λ (Å)

FWHM (Å)

AB mag zero point

Speak

Bλ

R80 (arcsec)

Flux in central pixel

3738.1

56.9

20.522

3.43e+14

60.5

0.12

17%

Figure 14.18: Throughput for F28x50OII



Table 14.8: F28X50OII Sensitivity & Throughput

λ

Sensitivity

% Throughput

3675.

6.26E12

0.07

3685.

3.31E13

0.39

3695.

9.81E13

1.17

3705.

1.63E14

1.93

3715.

2.23E14

2.63

3725.

2.67E14

3.14

3735.

2.48E14

2.91

3745.

2.65E14

3.10

3755.

3.12E14

3.64

3765.

2.89E14

3.37

3775.

1.42E14

1.65

3785.

2.77E13

0.32

Figure 14.19: Point Source S/N vs. Line Flux for the F28X50OII filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).


Figure 14.20: Extended Source S/N vs. V+ABν for the F28X50OII for gain =1.Top curves are for an area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).



Table 14.9: Radial Profile for F28X50OII

Radius


 

Fraction of Energy Encircled

Pixels

Arcsec

Intensity

1

0.050

1.945e-02

0.405

1.5

0.075

9.266e-03

0.622

2

0.100

3.589e-03

0.750

3

0.150

7.742e-04

0.849

4

0.200

3.628e-04

0.895

5

0.250

1.826e-04

0.924

10

0.500

1.966e-05

0.982

15

0.750

4.876e-06

0.997

20

1.000

5.800e-07

1.000

Figure 14.21: Point Source Encircled Energy for F28X50OII


Figure 14.22: Point Source Intensity vs. Radius for F28X50OII