{
  "abstract": "Galaxy mergers can drive gas toward galactic nuclei, enhancing both star formation and black hole accretion in post-merger galaxies. Here we use the IllustrisTNG-50 simulation and two boxes from the BRAHMA simulation suite, all of which adopt different black hole formation models, to characterize merger-associated signatures in candidate massive black hole (MBH)-pair hosts. In all three simulations, we select post-merger galaxies whose progenitors both host MBHs and quantify their enhancements in star formation and black hole accretion relative to matched non-merging controls. In TNG50, we find substantial merger-triggered enhancements in both specific star formation rate (sSFR) and specific black hole accretion rate (sBHAR) at $0 \\leq z < 3.3$, reaching $\\sim 1.4\\times$ and $\\sim 1.5-1.7\\times$ the controls, respectively. The BRAHMA runs employ more physically motivated seed formation models, seeding BHs in lower-mass galaxies and at higher redshifts than TNG50. In BRAHMA, merger-driven enhancements in sSFR and gas fractions are comparable to those in TNG50 at $z \\lesssim 3.3$ and persist to the highest redshifts probed by BRAHMA ($z \\sim 6$). Despite this, BRAHMA shows no significant merger-driven enhancement in sBHAR across its entire redshift range. In a similar vein, TNG50 pair hosts show an enhanced AGN fraction relative to matched controls, whereas BRAHMA shows only a weak excess among the most rapidly accreting MBHs.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.08709",
  "author_total": 3,
  "authors": [
    {
      "name": "Pranav Satheesh"
    },
    {
      "name": "Aklant K. Bhowmick"
    },
    {
      "name": "Laura Blecha"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/534h2vxmr6bf8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.08709",
  "fulltext_url": null,
  "id": "534h2vxmr6bf8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.08709",
  "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.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7221064195",
  "pdf_url": "https://arxiv.org/pdf/2610.08709",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/534h2vxmr6bf8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.08709",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.08709"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Galaxy merger-driven signatures in massive black hole pair hosts across cosmic time",
  "title_text": "Galaxy merger-driven signatures in massive black hole pair hosts across cosmic time",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/534h2vxmr6bf8",
  "venue": "arXiv",
  "versions": []
}