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Paper: (U)LIRG Morphology and Color: 70μm Selected Galaxies in the COSMOS Field
Volume: 408, The Starburst−AGN Connection
Page: 272
Authors: Kartaltepe, J.S.; Sanders, D.B.; Frayer, D.T.; LeFloc’h, E.; Arnouts, S.; Aussel, H.; Ilbert, O.; Koekemoer, A.; Salvato, M.; Scoville, N.; Surace, J.; Yan, L.
Abstract: We present the results of a morphological and color analysis of a sample of 110 70μm selected luminous and ultraluminous infrared galaxies (11.3 < log(LIR/Lʘ) < 12.8) for a single redshift bin (0.8 < z < 1.0) in the COSMOS field. We then compare our results to a similar analysis of an optically selected sample in the same redshift bin. Over 70% of the 70μm selected sources are found to be major mergers at late stages of interaction while only 21.5% of the optically selected sample are major mergers. This is in rough agreement with the morphology of local (U)LIRGs where all ULIRGs and most LIRGs are found to be gas-rich major mergers. We also find that the U − V color of the (U)LIRGs peaks in the “green valley,” in between the dichotomous “red sequence” and “blue cloud” of the optically selected galaxy population.
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