{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:L4GJBIRBNAQ2ZW3A62YNUA4DT2","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"26f6bf42c9354f3100ab10c59f36600f1d56601693ec3fd21143232cc4e33b66","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-01-10T20:50:17Z","title_canon_sha256":"3e317e1f90ff5ee1ca0596ab0d72e2b15e518f98c113e8011896ad8a38cb5897"},"schema_version":"1.0","source":{"id":"1101.1948","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.1948","created_at":"2026-05-18T04:26:46Z"},{"alias_kind":"arxiv_version","alias_value":"1101.1948v2","created_at":"2026-05-18T04:26:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.1948","created_at":"2026-05-18T04:26:46Z"},{"alias_kind":"pith_short_12","alias_value":"L4GJBIRBNAQ2","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_16","alias_value":"L4GJBIRBNAQ2ZW3A","created_at":"2026-05-18T12:26:34Z"},{"alias_kind":"pith_short_8","alias_value":"L4GJBIRB","created_at":"2026-05-18T12:26:34Z"}],"graph_snapshots":[{"event_id":"sha256:7ffa363630830b93c509b1df8af91f7b3e6bf05aabd0e456cb64d2b10fd01f89","target":"graph","created_at":"2026-05-18T04:26:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"X-shooter, with its characteristics of resolution, spectral coverage and efficiency, provides a unique opportunity to obtain spectra of the highest-redshift quasars (z ~ 6) that will allow us to carry out successful investigations on key cosmological issues, from the details of the re-ionization process, to the evolution of the first galaxies and AGNs. In this paper, we present the spectra of three z ~ 6 quasars: one obtained during the commissioning of X-shooter and two in the context of our ongoing GTO programme. Combining this sample with data in the literature, we update the value of the C","authors_text":"A. Cimatti, A. Fontana, A. Marconi, E. Giallongo, F. Fiore, F. Mannucci, G. Cupani, G. Vladilo, L. Pentericci, M. Nonino, M. Viel, P. Molaro, R. Maiolino, S. Cristiani, S. di Serego Alighieri, S. Gallerani, V. D'Odorico","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-01-10T20:50:17Z","title":"Optical-NIR spectra of quasars close to reionization (z~ 6)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.1948","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9687dcbff0743ec57ab5bef015920e043dcb58653d84f2a1e1a39437c16fb0ca","target":"record","created_at":"2026-05-18T04:26:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"26f6bf42c9354f3100ab10c59f36600f1d56601693ec3fd21143232cc4e33b66","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-01-10T20:50:17Z","title_canon_sha256":"3e317e1f90ff5ee1ca0596ab0d72e2b15e518f98c113e8011896ad8a38cb5897"},"schema_version":"1.0","source":{"id":"1101.1948","kind":"arxiv","version":2}},"canonical_sha256":"5f0c90a2216821acdb60f6b0da03839eb8eeabaf00cd13f2dc60782eb22fa5f1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f0c90a2216821acdb60f6b0da03839eb8eeabaf00cd13f2dc60782eb22fa5f1","first_computed_at":"2026-05-18T04:26:46.661053Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:26:46.661053Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9lRWA1qcA0capQnzcaBrwSWMSepFm2irw/4HzkbV6MsGFge5kuTeyJgeBv6Xw2KPL+Sxm+Yl2a6aV8WusYY9BA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:26:46.661575Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.1948","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9687dcbff0743ec57ab5bef015920e043dcb58653d84f2a1e1a39437c16fb0ca","sha256:7ffa363630830b93c509b1df8af91f7b3e6bf05aabd0e456cb64d2b10fd01f89"],"state_sha256":"7eb445ce375aaf5389d9dff4dc48711b71872ca7bb855b74724243736657ed2c"}