{
  "abstract": "Through the Low Resolution Spectroscopy (LRS) observing mode of JWST/MIRI, the P750L prism disperses the entire ~70\"$\\times$110\" imager field, turning MIRI into a wide-field slitless spectrograph (WFSS) at 5-14 $μ$m with spectral resolution $R\\sim100$. Using archival MIRI LRS data taken in the GOODS-N/S deep fields and calibration programs, we present a complete and precise calibration suite for MIRI WFSS through an AI-assisted agentic workflow under human supervision. The calibration includes flat field, sky background, spectral tracing, wavelength calibration, flux calibration, and the large-scale flux flat (L-flat). We present the methodology of each calibration and quantify its accuracy. As a demonstration, we extract 5-14 $μ$m slitless spectra of 180 spectroscopically confirmed galaxies at $z=0.08 - 3.71$ in the GOODS-N/S fields. We detect a large number of polycyclic aromatic hydrocarbon (PAH) bands and atomic lines (including Paschen $α$ out to $z=3.71$) in individual sources. The PAH 3.3 $μ$m luminosities correlate with the Paschen $α$ luminosities (measured through NIRCam WFSS) for $z\\sim1$ galaxies over a $\\sim$1.5-dex range, supporting PAH 3.3 $μ$m as a star-formation-rate tracer out to $z\\sim1.6$. We release the calibration reference files, reduction scripts, and the mid-infrared spectral atlas. We also present caveats and lessons learned from our archival calibration work. Our empirical sensitivity characterization identifies a noise floor for deep MIRI WFSS integrations ($\\gtrsim$ a few ks), whereas shallower integrations exceed the sensitivity predicted by the JWST Exposure Time Calculator. We also provide suggestions for the planning of future MIRI WFSS observing programs.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.20935",
  "author_total": 7,
  "authors": [
    {
      "name": "Fengwu Sun"
    },
    {
      "name": "Javier Álvarez-Márquez"
    },
    {
      "name": "Eiichi Egami"
    },
    {
      "name": "Román Fernández Aranda"
    },
    {
      "name": "Jakob M. Helton"
    },
    {
      "name": "Xiaojing Lin"
    },
    {
      "name": "Jianwei Lyu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9kb97309fhh6n.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.20935",
  "fulltext_url": null,
  "id": "9kb97309fhh6n",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.20935",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3105|Astronomy and Astrophysical Research"
    ]
  ],
  "openalex": "W7213943939",
  "pdf_url": "https://arxiv.org/pdf/2609.20935",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9kb97309fhh6n.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.20935",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.20935"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "title": "An Archival Calibration of JWST/MIRI Prism Wide-Field Slitless Spectroscopy: Methodology, Performance, and a Mid-Infrared Spectral Atlas of Galaxies at $z=0-4$ in the GOODS-N/S Fields",
  "title_text": "An Archival Calibration of JWST/MIRI Prism Wide-Field Slitless Spectroscopy: Methodology, Performance, and a Mid-Infrared Spectral Atlas of Galaxies at z=0−4 in the GOODS-N/S Fields",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/9kb97309fhh6n",
  "venue": "arXiv",
  "versions": []
}