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  • Lee, Bumhyun, et al. (author)
  • The Impact of the Group Environment on the Molecular Gas and Star Formation Activity
  • 2021
  • In: Proceedings of the International Astronomical Union. - 1743-9213 .- 1743-9221. ; , s. 136-139
  • Book chapter (other academic/artistic)abstract
    • At least half of the local galaxies reside in galaxy groups, which indicates that the group is the common environment where galaxies evolve. Therefore, it is important to probe how significantly galaxies are affected by group environmental processes, in order to obtain a better understanding of galaxy evolution. We carried out a new CO imaging survey for 31 galaxies in the IC 1459 and NGC 4636 groups, using the Atacama Compact Array, to study the effect of the group environment on the molecular gas properties and the star formation activity. With our resolved CO data, combined with high-resolution H i images, we find asymmetric CO and H i distributions in the group galaxies. Compared to isolated galaxies, group members have relatively low molecular gas fraction and low star formation rate. These results suggest that the group environment can change the properties of cold gas components and star formation in group galaxies.
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