IRAC: Calibration
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Overview
Extended source calibration
IRAC zero magnitude flux densities in Jy
| Channel | flux density | calibration factor (FLUXCONV) |
|---|---|---|
| Channel 1 | 280.9 +/- 4.1 Jy | 0.1088 |
| Channel 2 | 179.7 +/- 2.6 Jy | 0.1388 |
| Channel 3 | 115.0 +/- 1.7 Jy | 0.5952 |
| Channel 4 | 64.13 +/- 0.94 Jy | 0.2021 |
Calibration files
- Array-Location-Dependent Photometric Corrections for Compact Sources with Stellar Spectral Slopes
- IRAC Superflat
- Pixel Solid Angles
IRAC aperture corrections
| radius on source | background annulus | 3.6 µm | 4.5 µm | 5.8 µm | 8.0 µm |
|---|---|---|---|---|---|
| infinite | N/A | 0.944 | 0.937 | 0.772 | 0.737 |
| 10 | 12-20 | 1.000 | 1.000 | 1.000 | 1.000 |
| 5 | 12-20 | 1.049 | 1.050 | 1.058 | 1.068 |
| 5 | 5-10 | 1.061 | 1.064 | 1.067 | 1.089 |
| 3 | 12-20 | 1.112 | 1.113 | 1.125 | 1.218 |
| 3 | 3-7 | 1.124 | 1.127 | 1.143 | 1.234 |
| 2 | 12-20 | 1.205 | 1.221 | 1.363 | 1.571 |
| 2 | 2-6 | 1.213 | 1.234 | 1.379 | 1.584 |
References
Absolute Calibration of the Infrared Array Camera on the Spitzer Space Telescope, Reach et al., 2005, PASP, 117, 978"Supertemplates" and On-Orbit Calibrators for the SIRTF Infrared Array Camera, Cohen, M. et al., 2003, AJ, 125, 2645
Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars, Engelke, C. W. et al., 2006, AJ, 132, 1445
For more information, see the IRAC chapter of the SOM
