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LATED: Ly$α$-anchored photometric selection of candidate metal-free and extremely metal-poor star formation from the end of reionisation to cosmic noon — arXiv:2609.24588

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.24588
License (as archived): CC0-1.0
Archived: 2026-10-09T23:49:02.973Z
SHA-256 of the archived text: ad5c254b62b2f2ff1d71c9dc855a070b746abaeafb68a405b0529ee1fd2df447
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How to cite

LATED: Ly$α$-anchored photometric selection of candidate metal-free and extremely metal-poor star formation from the end of reionisation to cosmic noon — arXiv:2609.24588 — arXiv (en), https://arxiv.org/abs/2609.24588 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_dfd64066c0cd (Metraipolis archive dc_dfd64066c0cd, sha256 ad5c254b62b2f2ff1d71c9dc855a070b746abaeafb68a405b0529ee1fd2df447)

BibTeX

@misc{dcdfd64066c0cd,
  title = {LATED: Ly$α$-anchored photometric selection of candidate metal-free and extremely metal-poor star formation from the end of reionisation to cosmic noon — arXiv:2609.24588},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.24588},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_dfd64066c0cd; sha256 ad5c254b62b2f2ff1d71c9dc855a070b746abaeafb68a405b0529ee1fd2df447},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.24588. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Cosmological simulations allow a low-level tail of Population III (Pop III) star formation to persist to $z=2-6$. Spectroscopic confirmation is expensive, so an efficient photometric pre-selection is needed. We present LATED (Lyman-Alpha Tomography of Extremely Metal-poor Domains), which selects metal-free and extremely metal-poor candidates from a Ly$\alpha$-emitter parent sample using strong-line diagnostics. The method requires three bands and two colours, $x=m_{\rm OIII}-m_{{\rm H}\alpha}$ and $y=m_{{\rm H}\alpha}-m_{\rm cont}$, which trace oxygen abundance and the H$\alpha$ equivalent width, respectively. Requiring that the filters simultaneously contain [O III]+H$\beta$ and H$\alpha$, together with a Ly$\alpha$ parent selection, defines five windows spanning $z=1.92-6.60$ (four JWST/NIRCam, one Roman/WFI). The criteria, $x\geq x_{\rm min}(z)$ and $y\leq y_{\rm max}(z)$, are set by the per-redshift extrema of a forward-modelled Pop III template locus. Ordinary metal-enriched star-forming and AGN templates fall outside the selection region, and possible contaminants such as little red dots are flagged by their multi-band colours. To check contamination empirically, we apply LATED to 1126 JADES spectroscopic galaxies, and no source is selected in the four NIRCam windows. We release a Python package which converts the same photometry into R3=[O III]/H$\beta$ as a measurement or upper limit, reproducing JADES spectroscopy with small 0.12 dex scatter. Applied to 85 archival MUSE Ly$\alpha$ emitters in Abell 2744, LATED recovers the confirmed extremely metal-poor galaxy AMORE6 and reveals three new candidates at $z=3-5$. Photometry alone cannot establish a metal-free nature. LATED delivers prioritised candidates for spectroscopic follow-up, providing a scalable route toward a systematic census of late-time Pop III star formation.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-22 in astro-ph.IM).
Categorie arXiv: Astrophysics of Galaxies (astro-ph.GA) ; Cosmology and Nongalactic Astrophysics (astro-ph.CO); Instrumentation and Methods for Astrophysics (astro-ph.IM); Solar and Stellar Astrophysics (astro-ph.SR).
Pagina del lavoro: https://arxiv.org/abs/2609.24588 — 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 2026-10-09T22:50:22.316Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-09-22?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).