Origin of far-infrared emission in Seyfert and starburst galaxies

Statistics – Computation

Scientific paper

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Active Galactic Nuclei, Emission Spectra, Far Infrared Radiation, Seyfert Galaxies, Starburst Galaxies, Computational Astrophysics, Cosmic Dust, Galactic Evolution, Massive Stars, Star Formation, Supernovae

Scientific paper

The origin of FIR emission in starburst nuclei (SBN) and AGN is discussed by means of correlation diagrams, alpha(25, 60) vs forbidden O I/H-alpha and alpha(25, 60) vs S(1)/Br-gamma. For the SBN, it was found that there are tight correlations between alpha(25, 60) and forbidden O I/H-alpha and between alpha(25, 60) and S(1)Br-gamma. Late-phase SBN exhibit steeper 25-60-micron slopes and larger forbidden O I/H-alpha ratios than early-phase SBN. Thus the evolutionary stage of starburst activity would be an important factor in determining the observed values of alpha(25, 60), forbidden O I/H-alpha, and S(1)/Br-gamma. For the AGN, it was found that they scatter widely in the diagrams of alpha(25, 60) vs forbidden O I/H-alpha and alpha(25, 60) vs S(1)Br-gamma. The FIR emission of ultraluminous IR galaxies is fueled by starbursts rather than by the nonthermal source. In some AGN, the 25-60-micron slope is steeper than in the SBN, suggesting a higher population of nonionizing stars.

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