{
  "abstract": "Galaxies with stellar masses $M_\\star<10^8~M_\\odot$, hereafter referred to as extreme dwarf galaxies (EDGs), represent one of the least explored regimes in the search for accreting intermediate-mass black holes. Using the recent Vera C. Rubin Observatory Data Preview 2 (DP2; covering 2025-04-25 to 2026-01-06), we present the first systematic search for variability among EDGs in the ELAIS-S1 field, the most extensively observed LSST Deep-Drilling Field in DP2. Applying single-band and cross-band variability statistics to difference-imaging light curves for $6.2\\times10^4$ EDGs with archival multiwavelength characterizations, we identify seven variable EDG candidates, all brighter than $i$-band magnitude of 24 and located within $z<0.3$. The two brightest candidates are previously known AGNs, three have light curves more consistent with supernovae, and two do not have a clear nature. The sample corresponds to an apparent EDG variable fraction of $6.8_{-2.1}^{+3.1}\\times10^{-4}$ at $i$-band magnitudes brighter than 24 and is expected to consist primarily of AGNs and supernovae. Compared to a magnitude-matched massive-galaxy sample with the same variability selection applied, the EDG variable fraction is comparable or at most lower by up to a factor of three. This proof-of-concept study demonstrates that Rubin will identify a statistically meaningful sample of variable EDG candidates, opening a new regime for black-hole demographics. Spectroscopic follow-up will nevertheless be required to secure redshifts and confirm individual candidates.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10755",
  "author_total": 18,
  "authors": [
    {
      "name": "Fan Zou"
    },
    {
      "name": "W. N. Brandt"
    },
    {
      "name": "Elena Gallo"
    },
    {
      "name": "Franz E. Bauer"
    },
    {
      "name": "Angela Bongiorno"
    },
    {
      "name": "Colin J. Burke"
    },
    {
      "name": "Alister W. Graham"
    },
    {
      "name": "Hengxiao Guo"
    },
    {
      "name": "Lorena Hernández-García"
    },
    {
      "name": "Marcin Marculewicz"
    },
    {
      "name": "Dieu D. Nguyen"
    },
    {
      "name": "Swayamtrupta Panda"
    },
    {
      "name": "Alessandro Peca"
    },
    {
      "name": "Bindu Rani"
    },
    {
      "name": "Claudio Ricci"
    },
    {
      "name": "Ohad Shemmer"
    },
    {
      "name": "Wei Leong Tee"
    },
    {
      "name": "Zhibo Yu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/75fj6ahf0637k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10755",
  "fulltext_url": null,
  "id": "75fj6ahf0637k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10755",
  "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": "W7221152046",
  "pdf_url": "https://arxiv.org/pdf/2610.10755",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/75fj6ahf0637k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.10755",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10755"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Pushing Variability Searches to Extreme Dwarf Galaxies with the Vera C. Rubin Observatory Data Preview 2",
  "title_text": "Pushing Variability Searches to Extreme Dwarf Galaxies with the Vera C. Rubin Observatory Data Preview 2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/75fj6ahf0637k",
  "venue": "arXiv",
  "versions": []
}