IRS: Calibration: PUI Color Corrections
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F
= 
F = constant. The calculations take into account the
full spectral response of the instrument (see plot below). Due to the
so-called "Red Leak" (a small increase in response at about 28 microns)
some emission will be detected in the Blue Peak -Up camera for very cold
sources that would not have been detected in a system without the red
leak. This translates into large correction factors for very cold sources
(T < 50 K) observed with the Blue Peak-Up camera. While these numbers
are formally correct, the observers should be very wary of blindly
applying them to the data. Longer wavelength observations are advised in
this case.To get the peak-up flux for a non
F =
constant shape, divide the flux by the appropiate color correction
factor, as given by the tables below.Table 1: Peak-up Color
Corrections for F
B(T)
B(T)
| T | Blue | Red |
| 50 | 6.845 | 1.558 |
| 60 | 2.800 | 1.284 |
| 70 | 1.796 | 1.150 |
| 80 | 1.421 | 1.078 |
| 100 | 1.145 | 1.011 |
| 120 | 1.049 | 0.987 |
| 160 | 0.988 | 0.976 |
| 200 | 0.976 | 0.980 |
| 240 | 0.976 | 0.986 |
| 320 | 0.984 | 0.997 |
| 640 | 1.010 | 1.018 |
| 1280 | 1.025 | 1.029 |
| 2560 | 1.032 | 1.034 |
| 5120 | 1.036 | 1.037 |
| 10240 | 1.038 | 1.038 |
Table 2: Peak-up Color Corrections for F 
or F 
or F
|
Blue | Red | |
| -3.0 | 1.051 | 1.041 |
1.0 |
| -2.5 | 1.031 | 1.026 |
0.5 |
| -2.0 | 1.016 | 1.013 |
0.0 |
| -1.5 | 1.006 | 1.005 |
-0.5 |
| -1.0 | 1.000 | 1.000 |
-1.0 |
| -0.5 | 0.998 | 0.998 |
-1.5 |
| 0.0 | 1.000 | 1.000 |
-2.0 |
| 0.5 | 1.005 | 1.005 |
-2.5 |
| 1.0 | 1.013 | 1.013 |
-3.0 |
| 1.5 | 1.025 | 1.024 |
-3.5 |
| 2.0 | 1.039 | 1.039 |
-4.0 |
| 2.5 | 1.057 | 1.057 |
-4.5 |
| 3.0 | 1.078 | 1.078 |
-5.0 |
