{"paper":{"title":"X-rays from the High-Redshift Universe: The Chandra view","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Astronomy, Beverly Sackler Faculty of Exact Sciences, C. Vignali (1), D.M. Alexander (1) ((1) Department of Astronomy & Astrophysics, D.P. Schneider (1), F.E. Bauer (1), G.P. Garmire (1), Israel), Raymond, S. Kaspi (2), Tel-Aviv University, The Pennsylvania State University, University Park, USA; (2) School of Physics, W.N. Brandt (1)","submitted_at":"2002-10-14T20:17:25Z","abstract_excerpt":"The study of the X-ray properties of z>4 quasars has grown substantially over the last few years, mostly thanks to Chandra. Here we focus on (1) the average X-ray properties of an optically selected, luminous sample of nine z>4 Palomar Digital Sky Survey quasars recently observed by Chandra, and (2) the X-ray spectral properties of three z>4 AGNs in the Chandra Deep Field-North (CDF-N) using the 2 Ms exposure."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0210309","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":""},"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"}