{"paper":{"title":"Metals in the IGM approaching the re-ionization epoch: results from X-shooter at the VLT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"2), (2) INFN/National Institute of Nuclear Physics, (3) INAF-OAR, 4, (4) Cavendish Laboratory, 5), (5) Kavli Institute for Cosmology, (6) Universita` di Bologna, (7) INAF-OAArcetri, (8) Scuola Normale Superiore di Pisa, (9) Universita` di Firenze, A. Cimatti (6), A. Fontana (3), A. Marconi (9), Cambridge, E. Giallongo (3), F. Fiore (3), Firenze, Firenze Italy, F. Mannucci (7), G. Cupani (1), G. Vladilo (1) ((1) INAF-OATS, Italy, Italy), L. Pentericci (3), M. Centuri\\'on (1), M. Nonino (1), Monte Porzio Catone, M. Viel (1, P. Molaro (1), R. Maiolino (3, S. Cristiani (1, S. di Serego Alighieri (7), S. Gallerani (8), Trieste, UK, Univ. of Cambridge, V. D'Odorico (1)","submitted_at":"2013-06-19T16:28:25Z","abstract_excerpt":"We present the results of observations taken with the X-shooter spectrograph devoted to the study of quasars at z ~ 6. This paper focuses on the properties of metals at high redshift traced, in particular, by the C IV doublet absorption systems. Six objects were observed with resolutions ~27 and 34 km/s in the visual, and 37.5 and 53.5 km/s in the near infrared. We detected 102 C IV lines in the range: 4.35 < z < 6.2 of which 27 are above z ~ 5. Thanks to the characteristics of resolution and spectral coverage of X-shooter, we could also detect 25 Si IV doublets associated with the C IV at z>5"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.4604","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}