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We present an analysis of dust properties of a sample of close major-mergergalaxy pairs selected by K_s magnitude and redshift. The pairs represent thetwo populations of spiral-spiral (S+S) and mixed morphology spiral-elliptical(S+E). The CIGALE (Code Investigating GALaxy Emission) is used to fit dustmodels to the 2MASS, WISE and Herschel flux density measurements and derive theparameters describing the PAH contribution, interstellar radiation field (ISRF)and photo-dissociation regions (PDRs). Model fits verify our previous SpitzerSpace Telescope analysis that S+S and S+E pairs do not have the same level ofenhancement of star formation and differ in dust composition. The spirals ofmixed morphology galaxy pairs do not exhibit the enhancements in interstellarradiation field and therefore dust temperature for spirals in S+S pairs incontrast to what would be expected according to standard models of gasredistribution due to encounter torques. This suggests the importance of thecompanion environment/morphology in determining the dust properties of a spiralgalaxy in a close major-merger pair.

Major Merger Galaxy Pairs at z=0: Dust Properties and Companion Morphology