{
  "abstract": "Using deep XMM-Newton and Chandra observations, we compare the double-radio-relic galaxy cluster mergers MACS J1752.0+4440 and ZwCl 1856.8+6616. Both are 1:1 mass-ratio mergers with similar relic separations but differing nearly an order of magnitude in total mass. In MACS J1752.0+4440, the surface-brightness discontinuity at the northeastern relic yields Mach $M_ρ=1.4\\pm0.2$, while the temperature jump provides a weaker constraint, corresponding to $M_{kT}\\lesssim2.3$ at the $2σ$ level, lower than the radio-derived $M_{\\rm radio}=3.1\\pm0.1$. No discontinuity is detected at the southwestern relic. Thermodynamic maps and axial profiles reveal surviving relatively low-entropy cores embedded in Mpc-scale stripped-gas structures. The nearly uniform X-ray tail brightness and a southwestern plateau coincident with a third lensing mass peak favor a non-zero impact parameter and complex assembly history. In ZwCl 1856.8+6616, we do not detect a clear surface brightness discontinuity at either relic. The northern X-ray peak leads its brightest cluster galaxy (BCG) and lensing peak, while the hotter southern X-ray peak is laterally offset from its BCG and lensing peak. The asymmetric intracluster emission favors a phase near or after first apocenter, when displaced gas can develop a slingshot-like morphology. We present two TNG-Cluster analogs in which a minor merger followed by an off-axis major collision produces extended X-ray tails resembling MACS J1752.0+4440 and later leads to gas structures resembling ZwCl 1856.8+6616. X-ray morphology independently confirms the merger phases inferred from relic-based chronometry, placing MACS J1752.0+4440 before and ZwCl 1856.8+6616 after first apocenter, and demonstrating that similar relic and lensing configurations can correspond to distinct dynamical states.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10680",
  "author_total": 13,
  "authors": [
    {
      "name": "K. HyeongHan"
    },
    {
      "name": "K. Finner"
    },
    {
      "name": "W. Lee"
    },
    {
      "name": "E. Silich"
    },
    {
      "name": "W. Forman"
    },
    {
      "name": "C. Jones"
    },
    {
      "name": "A. Tümer"
    },
    {
      "name": "S. Randall"
    },
    {
      "name": "J. ZuHone"
    },
    {
      "name": "M. James Jee"
    },
    {
      "name": "D. Wittman"
    },
    {
      "name": "R. J. van Weeren"
    },
    {
      "name": "M. Troxel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5jtzf7mv9yw74.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10680",
  "fulltext_url": null,
  "id": "5jtzf7mv9yw74",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10680",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7221074041",
  "pdf_url": "https://arxiv.org/pdf/2610.10680",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5jtzf7mv9yw74.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.10680",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10680"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Exemplary Merging Clusters II: XMM-Newton and Chandra X-ray Observations of MACS J1752.0+4440 and ZwCl 1856.8+6616",
  "title_text": "Exemplary Merging Clusters II: XMM-Newton and Chandra X-ray Observations of MACS J1752.0+4440 and ZwCl 1856.8+6616",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/5jtzf7mv9yw74",
  "venue": "arXiv",
  "versions": []
}