Distribution of merging and post-merging galaxies in nearby galaxy clusters
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Kim, Duho Sheen, Yun-Kyeong Jaffé, Yara L. Kelkar, Kshitija Ranjan, Adarsh Piraino-Cerda, Franco Crossett, Jacob P. Lourenço, Ana Carolina Costa Martin, Garreth Nantais, Julie B. Demarco, Ricardo Treister, Ezequiel Yi, Sukyoung K. |
| author_facet | Kim, Duho Sheen, Yun-Kyeong Jaffé, Yara L. Kelkar, Kshitija Ranjan, Adarsh Piraino-Cerda, Franco Crossett, Jacob P. Lourenço, Ana Carolina Costa Martin, Garreth Nantais, Julie B. Demarco, Ricardo Treister, Ezequiel Yi, Sukyoung K. |
| contents | We study the incidence and spatial distribution of galaxies that are currently undergoing gravitational merging (M) or that have signs of a post merger (PM) in six galaxy clusters (A754, A2399, A2670, A3558, A3562, and A3716) within the redshift range, 0.05$\lesssim$$z$$\lesssim$0.08. To this aim, we obtained Dark Energy Camera (DECam) mosaics in $u^{\prime}$, $g^{\prime}$, and $r^{\prime}$-bands covering up to $3\times R_{200}$ of the clusters, reaching 28 mag/arcsec$^2$ surface brightness limits. We visually inspect $u^{\prime}$$g^{\prime}$$r^{\prime}$ color-composite images of volume-limited ($M_r < -20$) cluster-member galaxies to identify whether galaxies are of M or PM types. We find 4% M-type and 7% PM-type galaxies in the galaxy clusters studied. By adding spectroscopic data and studying the projected phase space diagram (PPSD) of the projected clustocentric radius and the line-of-sight velocity, we find that PM-type galaxies are more virialized than M-type galaxies, having 1--5% point higher fraction within the escape-velocity region, while the fraction of M-type was $\sim$10% point higher than PM-type in the intermediate environment. Similarly, on a substructure analysis, M types were found in the outskirt groups, while PM types populated groups in ubiquitous regions of the PPSD. Adopting literature-derived dynamical state indicator values, we observed a higher abundance of M types in dynamically relaxed clusters. This finding suggests that galaxies displaying post-merging features within clusters likely merged in low-velocity environments, including cluster outskirts and dynamically relaxed clusters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_06437 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Distribution of merging and post-merging galaxies in nearby galaxy clusters Kim, Duho Sheen, Yun-Kyeong Jaffé, Yara L. Kelkar, Kshitija Ranjan, Adarsh Piraino-Cerda, Franco Crossett, Jacob P. Lourenço, Ana Carolina Costa Martin, Garreth Nantais, Julie B. Demarco, Ricardo Treister, Ezequiel Yi, Sukyoung K. Astrophysics of Galaxies We study the incidence and spatial distribution of galaxies that are currently undergoing gravitational merging (M) or that have signs of a post merger (PM) in six galaxy clusters (A754, A2399, A2670, A3558, A3562, and A3716) within the redshift range, 0.05$\lesssim$$z$$\lesssim$0.08. To this aim, we obtained Dark Energy Camera (DECam) mosaics in $u^{\prime}$, $g^{\prime}$, and $r^{\prime}$-bands covering up to $3\times R_{200}$ of the clusters, reaching 28 mag/arcsec$^2$ surface brightness limits. We visually inspect $u^{\prime}$$g^{\prime}$$r^{\prime}$ color-composite images of volume-limited ($M_r < -20$) cluster-member galaxies to identify whether galaxies are of M or PM types. We find 4% M-type and 7% PM-type galaxies in the galaxy clusters studied. By adding spectroscopic data and studying the projected phase space diagram (PPSD) of the projected clustocentric radius and the line-of-sight velocity, we find that PM-type galaxies are more virialized than M-type galaxies, having 1--5% point higher fraction within the escape-velocity region, while the fraction of M-type was $\sim$10% point higher than PM-type in the intermediate environment. Similarly, on a substructure analysis, M types were found in the outskirt groups, while PM types populated groups in ubiquitous regions of the PPSD. Adopting literature-derived dynamical state indicator values, we observed a higher abundance of M types in dynamically relaxed clusters. This finding suggests that galaxies displaying post-merging features within clusters likely merged in low-velocity environments, including cluster outskirts and dynamically relaxed clusters. |
| title | Distribution of merging and post-merging galaxies in nearby galaxy clusters |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.06437 |