FP-SPLIT Slits 0.2X0.2FP(A-E) Apertures

Description

The FP-SPLIT slits consist of two sets of five slits; in each set the slits are all the same size. They are for use with the MAMA echelle gratings. It is possible to achieve high S/N data for bright targets, independently of the quality of the flat-field, by means of a special observing strategy wherein multiple spectrograms are obtained through these slits.

Special Considerations

See Chapter 12 for more details on obtaining high S/N spectral data.


Aperture

Projected Length (arcsec)

Width (arcsec)

0.2X0.2FPA

0.2

0.2

0.2X0.2FPB

0.2

0.2

0.2X0.2FPC

0.2

0.2

0.2X0.2FPD

0.2

0.2

0.2X0.2FPE

0.2

0.2

Figure 13.78: Schematic of the STIS Fixed-Pattern Slit Configuration.


AXIS1 corresponds to the dispersion direction, and AXIS2 to the spatial direction. Dimensions are not to scale.

FP-SPLIT Throughputs


Table 13.30: Throughput for 0.2X0.2FP(A–E).

λ

% Throughput

1200

54.7

1800

67.4

2400

73.9

3000

77.3

3600

79.7

4200

81.6

4800

82.7

5400

83.1

6000

82.0

Figure 13.79: 0.2X0.2FP(A-E) Aperture Throughput as a Function of Wavelength.