{
  "abstract": "We investigate the broad Br$γ$ line in the type-1 active galactic nucleus NGC 3783 using three-dimensional Monte Carlo electron-scattering radiative transfer with SKIRT. Paper-I reproduced the observed smooth core and broad wings by convolving an intrinsic Keplerian profile with the analytic electron-scattering kernel of Laor (2006). Here we instead transport photons through explicit source and scattering geometries. For a partially covered Keplerian source, three-dimensional transfer broadens only the scattered photons and leaves an unscattered double-peaked core. For the thin Keplerian source motivated by Paper-I, a comparison of four scattering-geometry classes shows that neither a disk-like scatterer nor the tested halo variants reproduce both the core and wings. We therefore construct a two-component-source (2CS) model containing an inner Keplerian source disk, a rotating disk haze, a nearly spherical halo haze, and direct emission from a slower outer disk. A reference 2CS calculation gives Xi^2 =1.154 at i=15 deg. Polar cones with an input radial optical depth tau_hole=0.1 preserve the line profile and give a measured Thomson-thin sightline. The preferred low redistribution width, full-column ionization, and weak recombination emission cannot all be realized by a uniform thermal halo. The 2CS model is therefore a physically motivated parametric description whose medium must ultimately be tested with self-consistent radiative transfer, ionization, and dynamics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.23368",
  "author_total": 2,
  "authors": [
    {
      "name": "Keiichi Wada"
    },
    {
      "name": "Bert Vander Meulen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0qf52thbdewtw.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.23368",
  "fulltext_url": null,
  "id": "0qf52thbdewtw",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.23368",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7222917362",
  "pdf_url": "https://arxiv.org/pdf/2610.23368",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0qf52thbdewtw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.23368",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.23368"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Broad Line Regions behind a Haze II: A Three-dimensional Electron-scattering Model of the Broad Br$γ$ Line in NGC 3783",
  "title_text": "Broad Line Regions behind a Haze II: A Three-dimensional Electron-scattering Model of the Broad Brγ Line in NGC 3783",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/0qf52thbdewtw",
  "venue": "arXiv",
  "versions": []
}