{
  "abstract": "We combine the Swift/UVOT+MaNGA catalog with 2MASS $K_s$ imaging to map the 2175Å attenuation bump at kiloparsec scales in nearby galaxies. We use two complementary estimators: an ultraviolet-to-near-infrared attenuation-curve method, yielding $A_{bump}^{UOIR}$ and $B$ for 2487 high-continuum-S/N spaxels, and the NUV-only method of \\citet{2025PASA...42...22B}, yielding $A_{bump}^{NUV}$ and $k_{bump}$ for 7934 spaxels. The two absolute bump estimates agree well where they overlap. We compare bump strength with local stellar-population, emission-line, attenuation-curve, and geometric diagnostics after separating star-forming (SF) and non-SF regions. The strongest bumps occur at low specific H$α$ surface brightness, $Σ_{\\text{H}α}/Σ_\\ast$, especially in non-SF regions, where this ratio traces ionized-gas emission per unit stellar mass rather than sSFR. The bump also weakens with EW(H$α$) and strengthens with $D_n4000$ and stellar age. In contrast, metallicity, inclination, galactocentric radius, $A_V$, and optical attenuation-curve slope are secondary predictors. The absolute strength $A_{bump}^{NUV}$ increases with $Σ_{\\text{H}α}$ and $Σ_\\ast$, while the relative strengths $k_{bump}$ and $B$ do not, indicating that absolute bump amplitude partly follows dust column whereas normalized strengths better trace effective bump prominence. These results support local radiation-field processing of the 2175Å carriers.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.10573",
  "author_total": 6,
  "authors": [
    {
      "name": "Ruonan Guo"
    },
    {
      "name": "Cheng Li"
    },
    {
      "name": "Tao Jing"
    },
    {
      "name": "Shuang Zhou"
    },
    {
      "name": "Niu Li"
    },
    {
      "name": "Zhuo Cheng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/07pnw9v1g6z3n.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.10573",
  "fulltext_url": null,
  "id": "07pnw9v1g6z3n",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.10573",
  "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": "W7168291270",
  "pdf_url": "https://arxiv.org/pdf/2607.10573",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/07pnw9v1g6z3n.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:22Z",
      "native_id": "2607.10573",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.10573"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Mapping Dust Attenuation at Kiloparsec Scales. III. The 2175Å Bump",
  "title_text": "Mapping Dust Attenuation at Kiloparsec Scales. III. The 2175Å Bump",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/07pnw9v1g6z3n",
  "venue": "arXiv",
  "versions": []
}