{
  "abstract": "We present a systematic study of the rest-frame ultraviolet (UV) and optical morphologies of Ly$α$ emitters (LAEs) at $z \\simeq 2$-$7$ from the SILVERRUSH multi-narrowband catalog, using JWST/NIRCam imaging from COSMOS-Web. We fit Sérsic profiles in four NIRCam filters (F115W, F150W, F277W, F444W) for LAEs spanning $\\sim 2.2$ Gyr of cosmic time. LAE sizes show a mild increase from rest-frame UV to optical wavelengths, with a median optical-to-UV size ratio of $R_{e,\\rm opt}/R_{e,\\rm UV} = 1.14^{+0.01}_{-0.02}$, indicating a small morphological $K$-correction; this offset is significant at $z \\leq 5.7$ but not at $z = 6.6$. The rest-frame optical sizes follow a power-law evolution, given by $R_e \\propto (1+z)^{-0.94 \\pm 0.09}$, decreasing from $0.91^{+0.07}_{-0.07}$ kpc at $z = 2.2$ to $\\sim 0.5$ kpc at $z \\gtrsim 5$, in close agreement with a recent JWST study of spectroscopically confirmed LAEs. The rest-frame optical size-mass relation slopes are broadly consistent with those of the general star-forming galaxy (SFG) population, while LAEs lie below it in normalization over $z \\sim 3$-$6$. More compact LAEs tend to exhibit higher Ly$α$ equivalent widths, a trend driven mainly by the most compact, marginally resolved sources. These compact systems also occupy elevated SFR surface-density regimes, consistent with a scenario in which concentrated star formation may facilitate Ly$α$ escape. No significant correlation of LAE rest-frame optical size with projected large-scale environment is found over $z \\simeq 2$-$7$, suggesting that LAE morphology may be governed primarily by internal galaxy properties, except possibly in the most extreme overdensities.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.25886",
  "author_total": 11,
  "authors": [
    {
      "name": "Ronaldo Laishram"
    },
    {
      "name": "Haruka Kusakabe"
    },
    {
      "name": "Satoshi Kikuta"
    },
    {
      "name": "Shunta Shimizu"
    },
    {
      "name": "Yusei Koyama"
    },
    {
      "name": "Tadayuki Kodama"
    },
    {
      "name": "Michaela Hirschmann"
    },
    {
      "name": "Greta Toni"
    },
    {
      "name": "Carter Flayhart"
    },
    {
      "name": "Rasha M. Samir"
    },
    {
      "name": "Novan Saputra Haryana"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0j59fgwntm4v9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.25886",
  "fulltext_url": null,
  "id": "0j59fgwntm4v9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.25886",
  "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": "W7214073175",
  "pdf_url": "https://arxiv.org/pdf/2609.25886",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0j59fgwntm4v9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.25886",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.25886"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Rest-Frame UV and Optical Structural Evolution of Narrowband-Selected Lyman-alpha Emitters at z = 2-7 with JWST/NIRCam",
  "title_text": "Rest-Frame UV and Optical Structural Evolution of Narrowband-Selected Lyman-alpha Emitters at z = 2-7 with JWST/NIRCam",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/0j59fgwntm4v9",
  "venue": "arXiv",
  "versions": []
}