{
  "abstract": "The ages and masses of star clusters may leave systematic signatures in the second-order spatial structure of semi-resolved photometric images. To test this hypothesis, we analyze the images using the Hessian matrix and identify basic luminous structures, termed peak cores. Applying this analysis to six-band PHAT/AP images of 1249 M31 clusters with CMD-based ages of 10--300 Myr and masses of $10^{2.2}$--$10^{4.5}\\,M_{\\odot}$, we examine the correlations of age and mass with the peak-core structural parameters, $C_S$ and $Q$. Younger clusters show larger $C_S$ values in the ultraviolet bands, with the strongest age--$C_S$ anti-correlation in F336W ($ρ=-0.61$), whereas more massive clusters show smaller $Q$ values, most clearly in F336W ($ρ=-0.44$). These correlations suggest that the contrast of UV-bright peak cores decreases with age, whereas increasing mass alters the abundance and spatial organization of detectable structures across different bands.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.23741",
  "author_total": 3,
  "authors": [
    {
      "name": "Yuan Liang"
    },
    {
      "name": "Chao-Wei Tsai"
    },
    {
      "name": "Jingwen Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8wezt5gwtzyss.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23741",
  "fulltext_url": null,
  "id": "8wezt5gwtzyss",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23741",
  "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": "W7214034835",
  "pdf_url": "https://arxiv.org/pdf/2609.23741",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8wezt5gwtzyss.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.23741",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23741"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Age and Mass Signatures in the Multiband Second-order Image Structure of Young Star Clusters in M31",
  "title_text": "Age and Mass Signatures in the Multiband Second-order Image Structure of Young Star Clusters in M31",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/8wezt5gwtzyss",
  "venue": "arXiv",
  "versions": []
}