{
  "abstract": "The Survey of HI in Extremely Low-mass Dwarfs (SHIELD) galaxy sample is an HI-selected catalog of galaxies that occupy the extreme low-mass end of the HI mass function. Our team is carrying out a comprehensive multi-wavelength observational program targeting these gas-rich, star-forming dwarf galaxies. The current paper presents H-alpha narrowband observations of the full SHIELD sample. We detect 55 of the 82 galaxies (67%) with nebular H-alpha emission, and infer sensitive upper limits to the H-alpha fluxes for the 27 non-detections. We derive H-alpha luminosities and star formation rates (SFRs), or upper limits, for all 82 SHIELD galaxies. We also present, for the first time, deep broadband and continuum-subtracted H-alpha images plus a summary of the properties for the entire sample. Our analysis of the H-alpha data re-affirms previous results which show that at low levels of star formation (log(SFR_{H-alpha}) < -2.5), H-alpha becomes an increasingly poor tracer of the recent average SFR as measured by far-UV (FUV) luminosities. However, we show that this effect is not strictly correlated with the mass of the galaxy. Some very low-mass SHIELD galaxies with higher H-alpha-based SFRs show good agreement with SFR_{FUV}. The SHIELD galaxies show no correlation between H-alpha SFR and gas mass fraction, but reveal a modest correlation between H-alpha specific SFR and gas mass fraction. Overall, the star formation efficiency exhibited by the SHIELD dwarfs is rather low, despite the gas-rich nature of the sample (68% have M_{gas} > M_{stellar}).",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.32159",
  "author_total": 12,
  "authors": [
    {
      "name": "Madeline Shepley"
    },
    {
      "name": "David G. Gormanous"
    },
    {
      "name": "John J. Salzer"
    },
    {
      "name": "Nathalie Haurberg"
    },
    {
      "name": "Steven Janowiecki"
    },
    {
      "name": "John M. Cannon"
    },
    {
      "name": "Elizabeth A. K. Adams"
    },
    {
      "name": "Martha P. Haynes"
    },
    {
      "name": "Alec S. Hirschauer"
    },
    {
      "name": "Kristen B. W. McQuinn"
    },
    {
      "name": "Katherine L. Rhode"
    },
    {
      "name": "Evan D. Skillman"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7a0jedceqzbr9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.32159",
  "fulltext_url": null,
  "id": "7a0jedceqzbr9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.32159",
  "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": "W7214715667",
  "pdf_url": "https://arxiv.org/pdf/2609.32159",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7a0jedceqzbr9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.32159",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.32159"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "H-alpha Star Formation Rates of the SHIELD Dwarf Galaxies",
  "title_text": "H-alpha Star Formation Rates of the SHIELD Dwarf Galaxies",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/7a0jedceqzbr9",
  "venue": "arXiv",
  "versions": []
}