{
  "abstract": "The cosmic evolution of galactic bars offers key insights into the dynamical history of disk galaxies. However, studies of high-redshift bars are severely hampered by observational effects such as resolution degradation and surface brightness dimming. To quantify these biases and establish a robust methodology of bar detection and measurement for high-redshift galaxies, we develop an automated pipeline integrating isophotal ellipse fitting and Fourier decomposition. We benchmark its performance using a comprehensive set of mock observations generated by artificially redshifting high-quality images of local barred galaxies to match the background and resolution of HST ($z \\approx 0.5-3$) and JWST ($z \\approx 1-6$) observations. We find that applying standard bar detection criteria derived from local galaxies to high-redshift data results in a severe underestimation of the bar fraction, missing $>50%$ of bars at $z>0.5$ in HST imaging and a similar fraction at $z>2$ in JWST imaging. Using adaptive, redshift-dependent criteria optimized via mock data achieves recovery rates above $60%$ out to $z \\approx 3$ for HST and $z \\approx 6$ for JWST. The ellipse fitting method significantly outperforms Fourier decomposition in measurement reliability. While ellipse fitting systematically underestimates bar length by $\\sim 4%$--$36%$ due to surface brightness dimming, this bias is consistent and correctable ($σ\\approx 0.88$--$2.22$); in contrast, the Fourier method is prone to catastrophic failures ($σ\\approx 2.40$--$6.14$) in the regime of low signal-to-noise ratio. We propose a standardized workflow that prioritizes mock-derived adaptive criteria and ellipse fitting, providing quantitative correction factors and empirical relations that enable future studies to recover intrinsic bar statistics from raw observations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.23501",
  "author_total": 4,
  "authors": [
    {
      "name": "Yi-Xiao Lyu"
    },
    {
      "name": "Luis C. Ho"
    },
    {
      "name": "Zhao-Yu Li"
    },
    {
      "name": "Ming-Yang Zhuang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/33e20gxay78t8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23501",
  "fulltext_url": null,
  "id": "33e20gxay78t8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23501",
  "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": "W7214008761",
  "pdf_url": "https://arxiv.org/pdf/2609.23501",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/33e20gxay78t8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.23501",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23501"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "On the Detectability and Measurement of Galactic Bars as a Function of Redshift",
  "title_text": "On the Detectability and Measurement of Galactic Bars as a Function of Redshift",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/33e20gxay78t8",
  "venue": "arXiv",
  "versions": []
}