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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 |
The IRAC magnitude system is defined in the Reach et al. (2005)
reference listed below.
Calibration files
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
Go back to IRAC page
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