A Two-Parameter Model for the Infrared/Submillimeter/Radio Spectral   Energy Distributions of Galaxies and AGN
  A two-parameter semi-empirical model is presented for the spectral energy distributions of galaxies with contributions to their infrared-submillimeter-radio emission from both star formation and accretion disk-powered activity. This model builds upon a previous one-parameter family of models for star-forming galaxies, and includes an update to the mid-infrared emission using an average template obtained from Spitzer Space Telescope observations of normal galaxies. Star-forming/AGN diagnostics based on PAH equivalent widths and broadband infrared colors are presented, and example mid-infrared AGN fractional contributions are estimated from model fits to the GOALS sample of nearby U/LIRGS and the 5MUSES sample of 24um-selected sources at redshifts 0 < z < 2. 
Daniel A. Dale, George Helou, Georgios E. Magdis, Lee Armus, Tanio   D\'iaz-Santos, and Yong Shi
astro-ph.GA astro-ph.CO