52X0.05 Aperture

Description

This slit is supported with use of the first-order gratings and prism and provides the best spatial and spectral resolution of the long slits. This aperture is the 2 pixel-wide slit in the dispersion direction for the MAMA first-order modes.

Special Considerations

Observations with this slit require a PEAKUP prior to science observations. The actual width of this aperture is 34 milliarcsec instead of 50 milliarcsec, the value suggested by its name. Special pseudo-apertures have been defined to minimize detector effects such as background and CTE. See next page for more information.


Table 13.18: 52X0.05 Throughputs.

λ

% Throughput

1200

31.0

1600

41.2

2000

46.6

2400

49.7

2800

50.6

3200

50.5

3600

49.6

4000

48.3

4400

46.9

4800

45.2

5200

43.5

5600

41.7

6000

40.0

6400

38.3

6800

36.8

7200

35.3

7600

33.9

8000

32.8

8400

31.7


Projected Length (arcsec)


 

Aperture

CCD

MAMA (M-modes)

MAMA (L-modes)

Width (arcsec)

52X0.05

52.0

28.0

25.0

0.034

Figure 13.65: 52X0.05 Aperture Throughput as a Function of Wavelength.