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Title: A two-parameter model for the infrared/submillimeter/radio spectral energy distributions of galaxies and active galactic nuclei

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/active galactic nucleus (AGN) diagnostics based on polycyclic aromatic hydrocarbon equivalent widths and broadband infrared colors are presented, and example mid-infrared AGN fractional contributions are estimated from model fits to the Great Observatories All-Sky LIRG Survey sample of nearby U/LIRGS and the Five mJy Unbiased Spitzer Extragalactic Survey sample of 24 μm selected sources at redshifts 0 ≲ z ≲ 4.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States)
  2. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)
  3. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom)
  4. Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125 (United States)
  5. School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22351466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; COLOR; DUSTS; EMISSION; ENERGY SPECTRA; GALAXIES; GALAXY NUCLEI; POLYCYCLIC AROMATIC HYDROCARBONS; RED SHIFT; SPACE; STARS; TELESCOPES