{
  "abstract": "Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the interstellar medium and are among its smallest carbonaceous grains. Their infrared emission bands trace this small-grain population together with the interstellar radiation field that excites it, and are widely used to diagnose photodissociation regions, dust processing and star formation. We present full-sky maps of the integrated radiance of the 3.3 $μ$m aromatic C-H stretch and the adjacent 3.4-3.5 $μ$m aliphatic complex, from SPHEREx QR2 Level-2 data. Existing all-sky PAH tracers are broadband, so the band emission can only be inferred as an excess over stellar and continuum emission; SPHEREx samples the spectrum finely enough for the bands to be fitted directly. We mask flagged detector pixels, subtract the per-pixel zodiacal-light model, subtract point sources with an empirically derived PSF, and coadd the results into inverse-variance-weighted HEALPix maps at 2.6' FWHM and Nside=4096 in 102 narrowband channels across Detector 4 (2.42-3.82 $μ$m). At every sky pixel we fit a continuum and the two bands. The combined band radiance is the primary product; its decomposition into the aromatic and aliphatic components is released alongside it as an estimate, with its modelling systematic stated. These are the first full-sky maps of PAH band emission, resolving the 3.3 and 3.4-3.5 $μ$m bands spectrally, and the first full-sky PAH maps from SPHEREx to be released. Because the 3.3 $μ$m band is emitted preferentially by the smallest PAHs, the maps trace directly a grain population, including the candidate carriers of anomalous microwave emission, that broadband PAH proxies reach only indirectly. The maps and their associated products, including a reliability mask, are publicly available with an explanatory supplement at https://research.iac.es/proyecto/radioforegroundsplus/pages/data-products/spherex-pahs.php.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.37878",
  "author_total": 7,
  "authors": [
    {
      "name": "Roke Cepeda-Arroita"
    },
    {
      "name": "Clive Dickinson"
    },
    {
      "name": "J. Alberto Rubiño-Martín"
    },
    {
      "name": "Ricardo T. Génova-Santos"
    },
    {
      "name": "Gabriel A. Hoerning"
    },
    {
      "name": "Stuart E. Harper"
    },
    {
      "name": "Debabrata Adak"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/brcvxr5tjn3zn.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.37878",
  "fulltext_url": null,
  "id": "brcvxr5tjn3zn",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.37878",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7214956806",
  "pdf_url": "https://arxiv.org/pdf/2609.37878",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/brcvxr5tjn3zn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.37878",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.37878"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "title": "A Full-Sky SPHEREx Map of Integrated 3.3 and 3.4 μm PAH Emission",
  "title_text": "A Full-Sky SPHEREx Map of Integrated 3.3 and 3.4 μm PAH Emission",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/brcvxr5tjn3zn",
  "venue": "arXiv",
  "versions": []
}