Abstract
Abstract We present new measurements of the 12CO (J = 1-0) emission from 16 luminous infrared galaxies (LIGs) at intermediate redshift (cz ∼ 10000-50000 km s−1). These new data were selected by isolated and normal morphology. Although there already exist measurements of CO emission from LIGs in the literature, they are mostly strongly interacting/merging systems. The new CO data represent an important new addition to the literature in that they both expand the relatively small number of samples of LIGs measured in CO, and they include an interesting subset of LIGs that were selected based on isolated and normal morphology. The CO observations were performed using the NRO 45-m telescope. >From measurements of the CO emission and the IRAS database, we discuss the molecular gas and dust properties of late-type galaxies at intermediate redshift. Comparisons of the CO and dust properties of the new result with those from other CO measurements have revealed the characteristics of this sample: (1) It shows the deepest CO observations of IRAS galaxies at intermediate redshift without any strong interaction features. (2) It has typical properties of normal IRAS galaxies in terms of star-formation efficiency, color-color diagrams and galactic nuclear activity. (3) It has a smaller gas-to-dust ratio than normal IRAS galaxies. This can be explained by a two-component dust model; our sample consists of mostly warm dust.
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