{
  "abstract": "We present a direct measurement of the Ly$α$ escape fraction, $f^{\\rm Lyα}_{\\rm esc}$, for H$α$ emitters (HAEs) at $z\\simeq6.2$ in the JWST CEERS field by combining JWST/NIRCam F470N imaging with Subaru/HSC NB872 imaging. This unique pair of narrow-band filters enables the simultaneous measurement of H$α$ and Ly$α$ fluxes from galaxies during the epoch of reionization (EoR). We select 84 HAEs from F470N excesses, among which 56 have reliable NB872 photometry and 14 are detected in Ly$α$. The completeness-weighted stack of the HAE sample yields a median $f^{\\rm Lyα}_{\\rm esc}$ at $z\\simeq6.2$ of $0.106^{+0.066}_{-0.044}$, which is in good agreement with recent measurements at similar redshifts. We further find that the stacked $f_{\\rm esc}^{\\rm Lyα}$ shows no statistically significant change as the H$α$ luminosity threshold is lowered over the range probed by our sample. If Ly$α$ escape traces Lyman continuum leakage, this may suggest that relatively H$α$-luminous HAEs, rather than only the faintest ones, can provide an important contribution to the ionizing photon budget during the EoR. For individual galaxies, $f^{\\rm Lyα}_{\\rm esc}$ positively correlates with Ly$α$ equivalent width and negatively correlates with the UV continuum slope $β$. We also find a tentative trend toward higher $f^{\\rm Lyα}_{\\rm esc}$ at smaller rest-frame UV sizes, but no significant correlation with SED-derived $E(B-V)$ or rest-frame optical size. Although based on a limited sample, these results suggest that the galaxy-to-galaxy variation in $f_{\\rm esc}^{\\rm Lyα}$ may be more closely linked to compact, low-attenuation star-forming components traced by the UV continuum than to global dust attenuation or the overall stellar structure.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.08264",
  "author_total": 18,
  "authors": [
    {
      "name": "Shunta Shimizu"
    },
    {
      "name": "Nobunari Kashikawa"
    },
    {
      "name": "Ryo Emori"
    },
    {
      "name": "Junya Arita"
    },
    {
      "name": "Kohei Inayoshi"
    },
    {
      "name": "Akio K. Inoue"
    },
    {
      "name": "Kei Ito"
    },
    {
      "name": "Satoshi Kikuta"
    },
    {
      "name": "Kentaro Koretomo"
    },
    {
      "name": "Mariko Kubo"
    },
    {
      "name": "Yongming Liang"
    },
    {
      "name": "Rieko Momose"
    },
    {
      "name": "Kentaro Nagamine"
    },
    {
      "name": "Masafusa Onoue"
    },
    {
      "name": "Rhythm Shimakawa"
    },
    {
      "name": "Yoshihiro Takeda"
    },
    {
      "name": "Hisakazu Uchiyama"
    },
    {
      "name": "Takehiro Yoshioka"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/34sjkcp66px8f.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.08264",
  "fulltext_url": null,
  "id": "34sjkcp66px8f",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.08264",
  "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": "W7167910065",
  "pdf_url": "https://arxiv.org/pdf/2607.08264",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/34sjkcp66px8f.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T12:21:14Z",
      "native_id": "2607.08264",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.08264"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Subaru meets JWST: A Direct Measurement of Ly$\\boldsymbolα$ Escape Fraction at $\\boldsymbol{z\\simeq6.2}$ with Dual Narrow-Band Imaging",
  "title_text": "Subaru meets JWST: A Direct Measurement of Lyα Escape Fraction at z≃6.2 with Dual Narrow-Band Imaging",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:50Z",
  "url": "https://research.draconitic.com/paper/34sjkcp66px8f",
  "venue": "arXiv",
  "versions": []
}