Discovery of three new near-pristine absorption clouds at z = 2.6–4.4
ABSTRACT We report the discovery of three new ‘near-pristine’ Lyman limit systems (LLSs), with metallicities ≈1/1000 solar, at redshifts 2.6, 3.8, and 4.0, with a targeted survey at the Keck Observatory. High-resolution echelle spectra of eight candidates yielded precise column densities of hydrogen...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2022-06, Vol.514 (3), p.3559-3578 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | ABSTRACT
We report the discovery of three new ‘near-pristine’ Lyman limit systems (LLSs), with metallicities ≈1/1000 solar, at redshifts 2.6, 3.8, and 4.0, with a targeted survey at the Keck Observatory. High-resolution echelle spectra of eight candidates yielded precise column densities of hydrogen and weak, but clearly detected, metal lines in seven LLSs; we previously reported the one remaining, apparently metal-free LLS, to have metallicity |
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| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stac1550 |