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Spatially-Resolved Spectra of Diffuse Galactic Light using 10.8 M DESI Sky Fibers — arXiv:2608.28740

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.28740
License (as archived): CC0-1.0
Archived: 2026-10-17T10:32:21.385Z
SHA-256 of the archived text: e3cb7f5902bacde09b5bc8d447a2398fcf51b290533b3a2c6bcd549cef526483
Stable URL of this page: https://metraipolis.com/documento/dc_bec6a273ea86

How to cite

Spatially-Resolved Spectra of Diffuse Galactic Light using 10.8 M DESI Sky Fibers — arXiv:2608.28740 — arXiv (en), https://arxiv.org/abs/2608.28740 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bec6a273ea86 (Metraipolis archive dc_bec6a273ea86, sha256 e3cb7f5902bacde09b5bc8d447a2398fcf51b290533b3a2c6bcd549cef526483)

BibTeX

@misc{dcbec6a273ea86,
  title = {Spatially-Resolved Spectra of Diffuse Galactic Light using 10.8 M DESI Sky Fibers — arXiv:2608.28740},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.28740},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bec6a273ea86; sha256 e3cb7f5902bacde09b5bc8d447a2398fcf51b290533b3a2c6bcd549cef526483},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.28740. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Using 10.8 million ``blank'' sky spectra from the DESI Year 3 dataset, we measure the diffuse galactic light (DGL) spectrum in the optical at spectral resolution $R \sim 4000$ by correlating with far-infrared emission from IRAS. Subdividing the sky into 54 deg$^2$ pixels (HEALPix, NSIDE = 8), we map the variation of the DGL correlation spectrum and nebular emission lines across the DESI footprint in the high-Galactic-latitude sky. The increased data volume over previous SDSS-based analyses enables several new detections in the DGL, including scattering both onto and out of the line of sight from neutral interstellar sodium and potassium. We further detect direct emission from ro-vibrational transitions of molecular hydrogen in the near-infrared with an absolute radiance of $0.65\substack{+0.13 \\ -0.12}\times10^{-9}~{\rm erg\, cm^{-2}\,s^{-1}\,sr^{-1}}$, roughly consistent with theoretical expectations, but with an apparent ortho-to-para line ratio that is lower by a factor of $0.60\substack{+0.28 \\ -0.27}$. We confirm previous detections of extended red emission (ERE) in the DGL and map its spatial variation. Our spatially resolved DGL maps provide important observational constraints for the radiative transfer efforts that are now possible with recent 3D models of the Milky Way.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-01 in astro-ph.IM).
Categorie arXiv: Astrophysics of Galaxies (astro-ph.GA) ; Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2608.28740 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-17T10:18:17.131Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-09-01?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).