{
  "abstract": "Near-infrared hydrogen recombination lines can provide robust star-formation rates if the effects of dust attenuation continue to diminish towards longer wavelengths. To quantify near-infrared attenuation and ultimately measure accurate star-formation rates (SFRs) at the height of cosmic star-formation, we present Pa$α$, Br$α$, and Br$β$ detections in $27$ luminous infrared galaxies at $z\\sim 1-2$, including pure star-forming galaxies as well as dust-obscure Active Galactic Nuclei (AGN). Using combined spectra from the JWST MIRI (Mid-Infrared Instrument) LRS (Low Resolution Spectrometer) and the Spitzer Space Telescope IRS we quantify the star formation rates of our sample using a sub-sample of 13 galaxies detected in Pa$α$ emission ($1.87\\, μ$m), 14 galaxies detected in Br$α$ ($4.05\\, μ$m), and 12 galaxies detected in Br$β$ ($2.63\\, μ$m). By combining multiple near-infrared recombination lines in individual galaxies we calculate nebular attenuation, finding $A_λ\\sim3$ mag at $\\sim2\\,μ$m and $A_λ\\sim1$ mag at $\\sim4\\,μ$m. Nebular lines trace the SFR on $\\sim 10$ Myr timescales, which we compare to the total infrared luminosity ($L_{\\rm IR}$) which probes the star formation over the last $\\sim 100$ Myr. SFRs measured from $L_{\\rm IR}$ using common conversions are systematically higher than the SFRs derived from attenuation-corrected nebular line measurements by a factor of $\\sim2.5$. This could be indicative of a declining or static star formation history with a past burst or systematic effects on $\\rm SFR_{\\rm IR}$ such as dust heating from evolved stellar populations, and/or an active galactic nucleus.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.22428",
  "author_total": 17,
  "authors": [
    {
      "name": "Virginia Vanicek"
    },
    {
      "name": "Jed McKinney"
    },
    {
      "name": "Alexandra Pope"
    },
    {
      "name": "Anna Sajina"
    },
    {
      "name": "Stacey Alberts"
    },
    {
      "name": "Meredith Stone"
    },
    {
      "name": "Lee Armus"
    },
    {
      "name": "Sinclaire M. Manning"
    },
    {
      "name": "Olivia Cooper"
    },
    {
      "name": "Tanio DÍaz-Santos"
    },
    {
      "name": "Miriam Eleazer"
    },
    {
      "name": "Caitlin Casey"
    },
    {
      "name": "Thomas S. -Y. Lai"
    },
    {
      "name": "Steven Finkelstein"
    },
    {
      "name": "Leonid Sajkov"
    },
    {
      "name": "Allison Kirkpatrick"
    },
    {
      "name": "Anthony Taylor"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0tyhz9chnezfp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.22428",
  "fulltext_url": null,
  "id": "0tyhz9chnezfp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.22428",
  "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": "W7214058030",
  "pdf_url": "https://arxiv.org/pdf/2609.22428",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0tyhz9chnezfp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.22428",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.22428"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Star Formation and Nebular Attenuation from Pa$α$, Br$α$, and Br$β$ in Massive Dust-obscured Galaxies at Cosmic Noon using JWST",
  "title_text": "Star Formation and Nebular Attenuation from Paα, Brα, and Brβ in Massive Dust-obscured Galaxies at Cosmic Noon using JWST",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/0tyhz9chnezfp",
  "venue": "arXiv",
  "versions": []
}