SSC Home Page
Spitzer Science Center
 SSC Home -  Active Mission -  Overview -  IRAC -  IRS -  MIPS -  Data Archive -  Data Analysis & Tools
Knowledgebase: IRAC
I need the most accurate PSF available to do image deconvolution and search for faint objects near a bright star in my image. Are such PSFs available?
Posted by Seppo Laine on 21 November 2008 12:09 PM
The STinyTim PSFs do not work well for IRAC. IRAC pixels are large relative to the spatial frequencies found in the PSF, and the response of an IRAC pixel to light varies with position on the pixel. Instead we recommend the use of the PRFs available on the IRAC PSF page. For image deconvolution and source fitting you need to use the core PRFs, and software which utilizes the PRF, not the PSF, such as APEX. For faint objects in the wings of bright stars the extended PRFs are best. We are developing a more accurate set of PRFs that extend further from the core which also take into account the variation of the PSF (and PRF) over each array. Please check the best observing strategy that we recommend for such cases (see Spitzer Observer's Manual's IRAC Chapter section on Best Observing practices).