Point source fitting of IRAC images using a PRF

Abstract Introduction The IRAC PRFs Use of the 5x Sampled PRFs Outside of Apex Modifications to the IRAC PRFs for use with APEX Results of tests of PRF fitting Photometry of moderately-resolved sources Positional accuracy A "How To" guide for IRAC point source photometry with APEX Appendix: pixel phase Bibliography

IRAC PSF page
Simfit final report
IRAC Post-BCD pages
IRAC photometry page
IRAC Data handbook

We discuss the use of point source response functions (PRFs) for fitting sources in IRAC data. (The PRFs now available are a significant improvement over those released by the SSC prior to August 2008.) For true point sources, we are able to obtain agreement between fitted and aperture flux measurements at better than the 1% level. In this document, we describe validation tests on point sources in IRAC data using these new PRFs in combination with the MOPEX/APEX software produced by the SSC. The procedure for using these PRFs in conjunction with MOPEX/APEX is given in the form of a ``How To'' description, and the necessary corrections to the resulting fluxes are detailed.

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