{"paper":{"title":"Examining the Decline in the C IV Content of the Universe over 4.3 < z < 6.3 using the E-XQR-30 Sample","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Andrea Pallottini, Anna-Christina Eilers, Emanuele Paolo Farina, Emma Ryan-Weber, Frederick B. Davies, George D. Becker, Guido Cupani, Laura C. Keating, Manuela Bischetti, Martin G. Haehnelt, Rebecca L. Davies, Romain A. Meyer, Sarah E. I. Bosman, Valentina D'Odorico, Yongda Zhu","submitted_at":"2023-03-06T01:09:13Z","abstract_excerpt":"Intervening CIV absorbers are key tracers of metal-enriched gas in galaxy halos over cosmic time. Previous studies suggest that the CIV cosmic mass density ($\\Omega_{\\rm CIV}$) decreases slowly over 1.5 $\\lesssim z\\lesssim$ 5 before declining rapidly at $z\\gtrsim$ 5, but the cause of this downturn is poorly understood. We characterize the $\\Omega_{\\rm CIV}$ evolution over 4.3 $\\lesssim z\\lesssim$ 6.3 using 260 absorbers found in 42 XSHOOTER spectra of $z\\sim$ 6 quasars, of which 30 come from the ESO Large Program XQR-30. The large sample enables us to robustly constrain the rate and timing of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.02816","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2303.02816/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}