{
  "abstract": "We investigate whether galaxies identified as superthin in optical images remain superthin in the near-infrared (NIR), and how their extreme disk morphology is related to environment. From a nearby volume-limited sample, we select 210 superthin galaxies using two-dimensional bulge/disk decomposition of SDSS $r$-band images, requiring the disk component to have a minor-to-major axis ratio $b/a<1/9$. We measure disk shapes from SDSS $griz$ to UKIDSS $JHK$ bands. Both the major- and minor-axis scales decrease from the optical to the NIR, reaching $\\sim0.6$ of their $r$-band values in the $K$ band, but the disk axis ratio remains nearly unchanged. Thus, optically selected superthin galaxies remain superthin in the NIR, suggesting that any NIR-dominant thick component, if present, is not prominent enough to alter the fitted disk shape. Reanalysis of our sample and a previous superthin sample shows that earlier reported NIR thickening is mainly due to a magnitude- and band-dependent bias in one-dimensional fitting. We further compare their environments with matched control samples using projected cross-correlations, reconstructed local overdensities, and large-scale-structure classifications. Superthin galaxies show lower clustering on $\\sim0.1$--$1\\,h^{-1}\\,\\mathrm{Mpc}$ scales and lower overdensities at $1\\,h^{-1}\\,\\mathrm{Mpc}$, but similar large-scale clustering and no clear residual dependence on large-scale-structure type. These results are consistent with a higher central-galaxy fraction and lower satellite fraction in the superthin sample, while the similar large-scale clustering points to comparable typical halo masses relative to the controls. This halo-occupation interpretation is qualitatively consistent with simulation-based scenarios in which high host-halo spin helps build extended thin disks, although the present data do not directly measure halo spin.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.00443",
  "author_total": 3,
  "authors": [
    {
      "name": "Jianhong Hu"
    },
    {
      "name": "Cheng Li"
    },
    {
      "name": "Dandan Xu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9tga00nz877a8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.00443",
  "fulltext_url": null,
  "id": "9tga00nz877a8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.00443",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2607.00443",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9tga00nz877a8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2607.00443",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.00443"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Optically Selected Superthin Galaxies Remain Thin in the Near-infrared",
  "title_text": "Optically Selected Superthin Galaxies Remain Thin in the Near-infrared",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/9tga00nz877a8",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1093/mnras/stag1759",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}