QUESTFIT: Mid-IR Spectral Fitting

This software package was originally used to fit the Spitzer mid-infrared spectra of the QUEST (Quasar ULIRG and Evolution STudy) sample, as described in Schweitzer et al. 2006, Schweitzer et al. 2008, and Veilleux et al. 2009. It uses two PAH templates from Smith et al. 2007 atop an extincted and absorbed continuum model to fit the mid-IR spectra of galaxies that are heavily-absorbed and AGN with silicate emission.

The current version of QUESTFIT is optimized for processing spectra from the CASSIS (Combined Atlas of Sources with Spitzer IRS Spectra) portal to produce PAH fluxes for heavily absorbed sources. This method is described in Spoon et al. 2021 (submitted). These PAH fluxes will appear in the IDEOS (Infrared Database of Extragalactic Observables from Spitzer) portal.