{
  "abstract": "Here we present deep JWST/NIRISS wide-field slitless spectroscopy (WFSS) that covers $\\mathrm{Hα}$ and $\\mathrm{Hβ}$ for galaxies at $0.5 < z < 3.5$ in the NGDEEP survey. The NGDEEP NIRISS observations detect emission line fluxes from galaxies in the Hubble Ultra Deep Field to $\\mathrm{m_{F150W}} \\lesssim$ 28 mag, enabling studies of star-formation based on $\\mathrm{Hα}$ (or $\\mathrm{Hβ}$, if necessary) in low-mass galaxies with $\\mathrm{\\log(M_*/M_{\\odot}) \\gtrsim 7}$ at z = 0.5 and $\\mathrm{\\log(M_*/M_{\\odot}) \\gtrsim 8}$ at z = 3.5. For 284 NGDEEP galaxies with $>3σ$ detections of $\\mathrm{Hα}$ or $\\mathrm{Hβ}$, we determine dust-corrected star-formation rates, $\\mathrm{SFR_{Hα}}$, via flux measurements of these Balmer lines and compare them to the galaxies' stellar masses to investigate the properties of the star-forming main sequence (SFMS) on short, $\\sim10$~Myr timescales across three redshift bins. When we contrast the intrinsic scatter in the $\\mathrm{Hα}$--based SFMS to that of a SFMS comprised of UV--based SFRs, which trace star formation within the past $\\sim 100$~Myr, we find that the \\Ha--based SFMS's intrinsic scatter ($\\approx0.35-0.5$~dex over $0.5 < z < 3.5$) is $\\approx0.2-0.4$~dex higher than the UV--based SFMS's intrinsic scatter at $z < 2.5$. We argue that brief ($\\lesssim10$~Myr) bursts of star formation likely account for this disparity in SFMS scatter. Theoretical predictions from the FIRE simulations underestimate the scatter we observe in the $\\mathrm{Hα}$--based SFMS at $1.5 < z < 2.5$ and $\\mathrm{\\log(M_*/M_{\\odot}) < 9}$ by up to $\\approx0.25$~dex, which suggests that low-mass galaxies have burstier star-formation histories than expected on $\\lesssim10$~Myr timescales.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.40796",
  "author_total": 10,
  "authors": [
    {
      "name": "Claire Bolda"
    },
    {
      "name": "Casey Papovich"
    },
    {
      "name": "Lu Shen"
    },
    {
      "name": "Nikko J. Cleri"
    },
    {
      "name": "L. Y. Aaron Yung"
    },
    {
      "name": "Vicente Estrada-Carpenter"
    },
    {
      "name": "Steven L. Finkelstein"
    },
    {
      "name": "Anton M. Koekemoer"
    },
    {
      "name": "Nor Pirzkal"
    },
    {
      "name": "Stephen M. Wilkins"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ay89z5d2085fp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40796",
  "fulltext_url": null,
  "id": "ay89z5d2085fp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40796",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40796",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ay89z5d2085fp.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T12:21:15Z",
      "native_id": "2610.40796",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40796"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "NGDEEP: Anchoring the $0.5 < z < 3.5$ Star-Forming Main Sequence at Low Stellar Masses with Ultradeep JWST/NIRISS WFSS",
  "title_text": "NGDEEP: Anchoring the 0.5 < z < 3.5 Star-Forming Main Sequence at Low Stellar Masses with Ultradeep JWST/NIRISS WFSS",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:51Z",
  "url": "https://research.draconitic.com/paper/ay89z5d2085fp",
  "venue": "arXiv",
  "versions": []
}