{
  "abstract": "Small-scale galaxy-galaxy weak lensing provides an independent way to probe the stellar initial mass function by constraining the matter distribution within galaxies. We forecast the potential of upcoming \\textit{Euclid} observations using realistic mock catalogues designed for a DESI-like Bright Galaxy Survey, which is expected to cover approximately $9000\\,\\mathrm{deg}^2$ of the \\textit{Euclid} wide survey area. We assess the impact of foreground lens light, which introduces significant scale-dependent biases in source detection, photometry, and shape measurements. Subtracting the lens light with \\textsc{Galfit} reduces these biases by nearly an order of magnitude at scales down to four times the half-light radius. We model the predicted lensing signal around central galaxies with stellar masses between $9.5 \\leq \\log(M_*/h^{-2}M_\\odot) \\leq 11.5$ over projected separations of $10$ to $100\\,h^{-1}\\mathrm{kpc}$. The resulting signal-to-noise ratios reach $\\sim 150$ for intermediate-mass galaxies. Assuming an NFW profile for the dark matter contribution, we constrain the stellar mismatch parameter $α$ to a precision of approximately $8.5$ percent for the full sample and $8.6$ percent for massive galaxies. These results highlight the potential of small-scale galaxy--galaxy weak lensing as a robust probe of the IMF and the connection between stellar and dark matter in galaxies using upcoming \\textit{Euclid} data.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.01541",
  "author_total": 5,
  "authors": [
    {
      "name": "Divya Rana"
    },
    {
      "name": "Henk Hoekstra"
    },
    {
      "name": "Konrad Kuijken"
    },
    {
      "name": "Alessandro Sonnenfeld"
    },
    {
      "name": "Maryam Tajalli"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7r0ppbr3y52jx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.01541",
  "fulltext_url": null,
  "id": "7r0ppbr3y52jx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.01541",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7215704016",
  "pdf_url": "https://arxiv.org/pdf/2610.01541",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7r0ppbr3y52jx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.01541",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.01541"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Weighing Galaxies Inside-Out: Small-Scale Lensing and the Stellar Mass Problem",
  "title_text": "Weighing Galaxies Inside-Out: Small-Scale Lensing and the Stellar Mass Problem",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/7r0ppbr3y52jx",
  "venue": "arXiv",
  "versions": []
}