A Study of the Merger History of the Galaxy Group HCG 62 Based on X-Ray 
Observations and Smoothed Particle Hydrodynamic Simulations

Hu, Dan; Xu, Haiguang; Kang, Xi; Li, Weitian; Zhu, Zhenghao; Ma, Zhixian; Shan, Chenxi; Zhang, Zhongli; Gu, Liyi; Liu, Chengze; Zheng, Qian; Wu, Xiang-ping

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A Study of the Merger History of the Galaxy Group HCG 62 Based on X-Ray Observations and Smoothed Particle Hydrodynamic Simulations

MPS-Authors

Hu, Dan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Xu, Haiguang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kang, Xi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Li, Weitian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhu, Zhenghao
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ma, Zhixian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shan, Chenxi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang, Zhongli
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gu, Liyi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Liu, Chengze
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zheng, Qian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wu, Xiang-ping
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...870...61H
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Citation

Hu, D., Xu, H., Kang, X., Li, W., Zhu, Z., Ma, Z., et al. (2019). A Study of the Merger History of the Galaxy Group HCG 62 Based on X-Ray Observations and Smoothed Particle Hydrodynamic Simulations. The Astrophysical Journal, 870.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D0EA-8

Abstract

We chose the bright compact group HCG 62, which has been found to exhibit both excess X-ray emission and high Fe abundance to the southwest of its core, as an example to study the impact of mergers on chemical enrichment in the intragroup medium. We first reanalyze the high-quality Chandra and XMM-Newton archive data to search for evidence of additional SN II yields, which is expected to be a direct result of the possible merger-induced starburst. We reveal that, similar to the Fe abundance, the Mg abundance also shows a high value in both the innermost region and the southwest substructure, forming a high- abundance plateau. Meanwhile, all the SN Ia and SN II yields show rather flat distributions in >0.1r ₂₀₀ in favor of an early enrichment. Then, we carry out a series of idealized numerical simulations to model the collision of two initially isolated galaxy groups by using the TreePM-SPH GADGET-3 code. We find that the observed X-ray emission and metal distributions, as well as the relative positions of the two bright central galaxies with reference to the X-ray peak, can be well reproduced in a major merger with a mass ratio of 3 when the merger-induced starburst is assumed. The “best-match” snapshot is pinpointed after the third pericentric passage when the southwest substructure is formed due to gas sloshing. By following the evolution of the simulated merging system, we conclude that the effects of such a major merger on chemical enrichment are mostly restricted to within the core region when the final relaxed state is reached.