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Paper: Molecular Gas Properties and Star Formation in Interacting Galaxies
Volume: 477, Galaxy Mergers in an Evolving Universe
Page: 83
Authors: Kaneko, H.; Kuno, N.; Iono, D.; Tamura, Y.; Tosaki, T.; Nakanishi, K.; Sawada, T.
Abstract: We present results of 12CO(J = 1-0) observations using NRO 45m radio telescope toward four interacting galaxies in the early and the mid stage of the interaction (Arp 84, VV 219, VV 254 and the Antennae Galaxies). We obtain central concentration of molecular gas and find interacting galaxies in the early and the mid stage have lower gas concentration toward the nuclei compared to isolated galaxies. We find molecular gas fraction in interacting galaxies is higher than isolated galaxies. With model fitting, this high molecular gas fraction is owing to high external pressure induced by the interaction. We also examine the relation between star formation rate and the surface density of interstellar gas (the sum of molecular and atomic hydrogen gas) resolving galactic structures. The relation is same as isolated galaxies, which suggests that high molecular gas fraction does not connect directly to the active star forming activity in interacting galaxies.
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