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arxiv: 1402.1495 · v1 · submitted 2014-02-06 · 🌌 astro-ph.GA · astro-ph.CO

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A Two-Parameter Model for the Infrared/Submillimeter/Radio Spectral Energy Distributions of Galaxies and AGN

Daniel A. Dale , George Helou , Georgios E. Magdis , Lee Armus , Tanio D\'iaz-Santos , Yong Shi
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classification 🌌 astro-ph.GA astro-ph.CO
keywords galaxiesmodelcontributionsdistributionsemissionenergyinfraredmid-infrared
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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.

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