천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제46권2호
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- Pages.72.1-72.1
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- 2021
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- 1226-2692(pISSN)
Merging histories of Galaxies in Deep and Wide Images of 7 Abell Clusters with Various Dynamical States
- Kim, Duho (Korea Astronomy and Space Science Institute) ;
- Sheen, Yun-Kyeong (Korea Astronomy and Space Science Institute) ;
- Jaffe, Yara L. (Instituto de Fisica y Astronomia, Universidad de Valparaiso) ;
- Ranjan, Adarsh (Korea Astronomy and Space Science Institute) ;
- Yi, Sukyoung K. (Yonsei University) ;
- Smith, Rory (Korea Astronomy and Space Science Institute)
- 발행 : 2021.10.13
초록
Galaxy mergers are known to have been one of the main drivers in galaxy evolution in a wide range of environments. However, in galaxy clusters, high-speed encounters have been believed to undermine the role of mergers as a driver in galaxy evolution. Nonetheless, a high fraction (~38% in Sheen et al. 2012 and ~20% in Oh et al. 2018) of galaxies with post-merging features have been reported in deep (>~28 mag/arcsec2) optical surveys of cluster galaxies. The authors argue that these galaxies could have merged outside of the cluster and, later, fallen into the cluster, sustaining their long-lasting post-merging features. On the other hand, when galaxy clusters interact, galaxy orbits might be destabilized resulting in a higher galaxy merger rate. To test this idea, we measure the ongoing-merger fraction of galaxies in deep DECam mosaic data of seven Abell clusters (A754, A2399, A2670, A3558, A3574, A3659 and A3716) with a variety of dynamical states (0.016
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