Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

F25CIII-NUV-MAMA

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Description

The F25CIII filter with the NUV-MAMA provides narrow band imaging of the C III] 1907 + 1909 Å feature.

Recommended Uses

C III] imaging.

Pivot (Å)	FWHM (Å)	AB mag zero point	Speak	B	R80 (arcsec)	Flux in central pixel
2011.0	389.3	19.371	1.01e+13	205.6	0.23	10%

Figure 14.55: F25CIII NUV-MAMA Integrated System Throughput and Redleak


 

Table 14.22: F25CIII NUV-MAMA Sensitivity & Throughput

	Sensitivity	% Throughput
1750.	1.82E11	0.00
1800.	3.89E11	0.01
1850.	1.33E12	0.03
1900.	4.91E12	0.11
1950.	9.37E12	0.21
2000.	9.44E12	0.21
2050.	6.81E12	0.15
2100.	3.78E12	0.08
2150.	1.79E12	0.04
2200.	7.92E11	0.02
2250.	3.89E11	0.01

Figure 14.56: Point Source S/N vs. V+AB for the F25CIII NUV-MAMA mode. Curves are labeled by required exposure time (sec).


 
Figure 14.57: Extended Source S/N vs. V+AB for the F25CIII NUV-MAMA mode. 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 (sec).


 

Table 14.23: Radial Profile for F25CIII*

Radius			Fraction of Energy Encircled
Pixels	Arcsec	intensity
1	0.024	4.859e-02	0.173
1.5	0.037	3.660e-02	0.284
2	0.049	2.557e-02	0.392
3	0.073	9.899e-03	0.528
4	0.098	3.609e-03	0.598
5	0.122	1.832e-03	0.649
10	0.245	2.759e-04	0.753
15	0.367	1.339e-04	0.822
20	0.490	7.056e-05	0.873
25	0.613	4.358e-05	0.911
30	0.735	3.353e-05	0.944
40	0.980	1.002e-05	0.981

* See STIS ISR 2003-01.

Figure 14.58: Point Source PSF for F25CIII NUV-MAMA, 7."5 square (at pixel 741,402, log scaled, B-V=-0.04). Note PSF ghost ~45 pixels left of peak pixel and a few 10^-3 of the peak


 
Figure 14.59: Point Source Encircled Energy for F25CIII NUV-MAMA


 
Figure 14.60: Point Source Intensity vs. Radius for F25CIII NUV-MAMA