The table, below, compares the COS sensitivities to those of various STIS spectroscopic modes. The sensitivity depends upon the size of the spectral resolution element. Thus, for each mode, values for both the native resolution and binned resolution of the mode are provided to make these comparisons easier.
| Mode | λ/Δλ | Binning | Sλ (1013 cnt s-1 resel-1) / (erg cm-2 s-1 Å-1) |
||
|---|---|---|---|---|---|
| FUV Modes | λ=1300Å | λ=1600Å | |||
COS G130M COS G160M |
20,000 |
--- |
1.0 |
0.69 |
|
10,000 |
x2 |
2.0 |
1.4 |
||
2,500 |
x8 |
8.0 |
5.5 |
||
1,000 |
x20 |
20. |
14. |
||
STIS E140M |
45,800 |
--- |
0.060 |
0.024 |
|
20,000 |
x2.3 |
0.14 |
0.055 |
||
STIS G140M |
10,000 |
--- |
0.66 |
0.13 |
|
2,500 |
x4 |
2.6 |
0.52 |
||
COS G140L |
3.4 |
||||
1,000 |
x2.5 |
20. |
8.5 |
||
| STIS G140L | 1,000 |
--- |
12.6 |
3.0 |
|
| NUV Modes |  =1800Å |
=2300Å |
=2800Å |
||
COS G185M COS G225M COS G285M |
20,000 |
--- |
0.43 |
1.1 |
1.5 |
10,000 |
x2 |
0.86 |
2.2 |
2.0 |
|
2,500 |
x8 |
3.4 |
8.8 |
12. |
|
500 |
x40 |
17. |
44. |
60. |
|
STIS E230M |
30,000 |
--- |
0.062 |
0.30 |
0.36 |
20,000 |
x1.5 |
0.093 |
0.45 |
0.54 |
|
STIS G230M |
10,000 |
--- |
0.20 |
||
2,500 |
x4 |
0.80 |
3.8 |
4.1 |
|
COS G230L |
2,500 |
--- |
5.2 |
9.4 |
6.5 |
500 |
x5 |
26. |
47. |
32. |
|
| STIS G230L | 500 |
--- |
8.8 |
32. |
34. |