{
  "abstract": "We present ALMA Cycle~7 \\cotwo\\ observations of the circumnuclear disk in NGC~315 at an angular resolution of $0\\farcs230\\times0\\farcs175$, improving on past measurements and resolving the sphere of influence (SOI) of the supermassive black hole (SMBH), whose mass has previously been estimated of $M_{\\rm BH}= \\left(2.08^{+0.33}_{-0.15}\\right) \\times 10^9$~M$_\\odot$ The high spatial resolution and sensitivity enable robust full-cube forward modeling of the molecular gas kinematics and a direct comparison of multiple independent gas-based dynamical modeling techniques. We apply standard Bayesian codes using both MCMC and nested sampling approaches, as well as a frequentist code to the same dataset, exploring systematic uncertainties associated with the stellar mass distribution, gas surface-brightness parameterization, and disk geometry. All methods yield consistent black hole masses, indicating that the inferred $M_{\\rm BH}$ is not strongly method-dependent. Combining the ensemble of independent molecular-gas-based models, we derive an ensemble median black hole mass of $M_{\\rm BH}/10^9\\,\\mathrm{M_\\odot} = 2.02^{+0.04}_{-0.05}$(stat)$^{+0.05}_{-0.04}$(sys), where the comparable contributions to the full error budget arise from modeling systematics rather than formal fitting uncertainties. Our $M_{\\rm BH}$ is consistent with the empirical $M_{\\rm BH}$--$σ_\\star$ and $M_{\\rm BH}$--$L_{\\rm bulge}$ scaling relations, and lies 32\\% below an independent stellar-dynamical measurement, a discrepancy we discuss in the context of systematic differences between gas- and stellar-based methods. NGC~315 serves as a benchmark for quantifying molecular gas-dynamical $M_{\\rm BH}$ systematic uncertainties and for future cross-comparisons of gaseous and stellar dynamical approaches.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.31015",
  "author_total": 14,
  "authors": [
    {
      "name": "Dieu D. Nguyen"
    },
    {
      "name": "Benjamin D. Boizelle"
    },
    {
      "name": "Hai N. Ngo"
    },
    {
      "name": "Elena Gallo"
    },
    {
      "name": "Tuan N. Le"
    },
    {
      "name": "Sabine Thater"
    },
    {
      "name": "Tien H. T. Ho"
    },
    {
      "name": "Tinh Q. T. Le"
    },
    {
      "name": "Que T. Le"
    },
    {
      "name": "Sam Norcross"
    },
    {
      "name": "Xueyi Li"
    },
    {
      "name": "Huy G. Tong"
    },
    {
      "name": "Nghi K. N. Le"
    },
    {
      "name": "Huy M. B. Tran"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/49pjq6h3peydw.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.31015",
  "fulltext_url": null,
  "id": "49pjq6h3peydw",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.31015",
  "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": "W7204947049",
  "pdf_url": "https://arxiv.org/pdf/2608.31015",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/49pjq6h3peydw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.31015",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.31015"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "ALMA CO(2-1) Gas Dynamics in NGC 315: A Multi-Method Benchmark for Supermassive Black Hole Mass Measurement",
  "title_text": "ALMA CO(2-1) Gas Dynamics in NGC 315: A Multi-Method Benchmark for Supermassive Black Hole Mass Measurement",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/49pjq6h3peydw",
  "venue": "arXiv",
  "versions": []
}