What boost galaxy mergers in two massive galaxy protoclusters at z = 2.24
| Autor: | Shuang Liu, Xian Zhong Zheng, Dong Dong Shi, Zheng Cai, Xiaohui Fan, Xin Wang, Qirong Yuan, Haiguang Xu, Zhizheng Pan, Wenhao Liu, Jianbo Qin, Yuheng Zhang, Run Wen |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Characterizing the structural properties of galaxies in high-redshift protoclusters is key to our understanding of the environmental effects on galaxy evolution in the early stages of galaxy and structure formation. In this study, we assess the structural properties of 85 and 87 Halpha emission-line candidates (HAEs) in the densest regions of two massive protoclusters, BOSS1244 and BOSS1542, respectively, using HST H-band imaging data. Our results show a true pair fraction of 22+-5 (33+-6) percent in BOSS1244 (BOSS1542), which yields a merger rate of 0.41+-0.09 (0.52+-0.04) per Gyr for massive HAEs with log (M_*/M_sun) > 10.3. This rate is 1.8 (2.8) times higher than that of the general fields at the same epoch. Our sample of HAEs exhibits half-light radii and Sersic indices that cover a broader range than field star-forming galaxies. Additionally, about 15 percent of the HAEs are as compact as the most massive (log(M_*/M_sun) > 11) spheroid-dominated population. These results suggest that the high galaxy density and cold dynamical state (i.e., velocity dispersion of 20 pages, 5 figures, 1 table. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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