Pre- and post-processing of cluster galaxies out to $5 \times R_{200}$: The extreme case of A2670
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Piraino-Cerda, Franco Jaffé, Yara L. Lourenço, Ana C. Crossett, Jacob P. Salinas, Vicente Kim, Duho Sheen, Yun-Kyeong Kelkar, Kshitija Pallero, Diego Bravo-Alfaro, Hector |
| author_facet | Piraino-Cerda, Franco Jaffé, Yara L. Lourenço, Ana C. Crossett, Jacob P. Salinas, Vicente Kim, Duho Sheen, Yun-Kyeong Kelkar, Kshitija Pallero, Diego Bravo-Alfaro, Hector |
| contents | We study galaxy interactions in the large scale environment around A2670, a massive ($M_{200}$ = $8.5 \pm 1.2~\times 10^{14} \mathrm{M_{\odot}}$) and interacting galaxy cluster at z = 0.0763. We first characterize the environment of the cluster out to 5$\times R_{200}$ and find a wealth of substructures, including the main cluster core, a large infalling group, and several other substructures. To study the impact of these substructures (pre-processing) and their accretion into the main cluster (post-processing) on the member galaxies, we visually examined optical images to look for signatures indicative of gravitational or hydrodynamical interactions. We find that $\sim 21$ % of the cluster galaxies have clear signs of disturbances, with most of those ($\sim60$ %) likely being disturbed by ram pressure. The number of ram-pressure stripping candidates found (101) in A2670 is the largest to date for a single system, and while they are more common in the cluster core, they can be found even at $> 4 \times R_{200}$, confirming cluster influence out to large radii. In support of a pre-processing scenario, most of the disturbed galaxies follow the substructures found, with the richest structures having more disturbed galaxies. Post-processing also seems plausible, as many galaxy-galaxy mergers are seen near the cluster core, which is not expected in relaxed clusters. In addition, there is a comparable fraction of disturbed galaxies in and outside substructures. Overall, our results highlight the complex interplay of gas stripping and gravitational interactions in actively assembling clusters up to $5\times R_{200}$, motivating wide-area studies in larger cluster samples. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_06973 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pre- and post-processing of cluster galaxies out to $5 \times R_{200}$: The extreme case of A2670 Piraino-Cerda, Franco Jaffé, Yara L. Lourenço, Ana C. Crossett, Jacob P. Salinas, Vicente Kim, Duho Sheen, Yun-Kyeong Kelkar, Kshitija Pallero, Diego Bravo-Alfaro, Hector Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We study galaxy interactions in the large scale environment around A2670, a massive ($M_{200}$ = $8.5 \pm 1.2~\times 10^{14} \mathrm{M_{\odot}}$) and interacting galaxy cluster at z = 0.0763. We first characterize the environment of the cluster out to 5$\times R_{200}$ and find a wealth of substructures, including the main cluster core, a large infalling group, and several other substructures. To study the impact of these substructures (pre-processing) and their accretion into the main cluster (post-processing) on the member galaxies, we visually examined optical images to look for signatures indicative of gravitational or hydrodynamical interactions. We find that $\sim 21$ % of the cluster galaxies have clear signs of disturbances, with most of those ($\sim60$ %) likely being disturbed by ram pressure. The number of ram-pressure stripping candidates found (101) in A2670 is the largest to date for a single system, and while they are more common in the cluster core, they can be found even at $> 4 \times R_{200}$, confirming cluster influence out to large radii. In support of a pre-processing scenario, most of the disturbed galaxies follow the substructures found, with the richest structures having more disturbed galaxies. Post-processing also seems plausible, as many galaxy-galaxy mergers are seen near the cluster core, which is not expected in relaxed clusters. In addition, there is a comparable fraction of disturbed galaxies in and outside substructures. Overall, our results highlight the complex interplay of gas stripping and gravitational interactions in actively assembling clusters up to $5\times R_{200}$, motivating wide-area studies in larger cluster samples. |
| title | Pre- and post-processing of cluster galaxies out to $5 \times R_{200}$: The extreme case of A2670 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2401.06973 |