{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:7H7PCMGPBC5RPCI2URVMYIFSV5","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":"1d4ec5c2cd0ddfc19b807437d1c30da64c594ef938ca97c48bf24df99aaea2f6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-06-07T12:17:34Z","title_canon_sha256":"4b63c71d145d9b0f4035cb12cd4705528e4ba809be2d9dad8cafa981eeaff7ca"},"schema_version":"1.0","source":{"id":"astro-ph/0106127","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0106127","created_at":"2026-05-18T01:22:59Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0106127v1","created_at":"2026-05-18T01:22:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0106127","created_at":"2026-05-18T01:22:59Z"},{"alias_kind":"pith_short_12","alias_value":"7H7PCMGPBC5R","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"7H7PCMGPBC5RPCI2","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"7H7PCMGP","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:b9299bd58aebd19f48b976a194c06ee62de0ac0fcff26b5cbd981611ba5c19e6","target":"graph","created_at":"2026-05-18T01:22:59Z","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":"(Abridged) This is the second in a series of three papers which present and interpret basic observational data on the 6C* 151-MHz radio sample: a low-frequency selected sample which exploits filtering criteria based on radio properties (steep spectral index and small angular size) to find radio sources at redshift z > 4 within a 0.133sr patch of sky. We present results of a programme of optical spectroscopy which has yielded redshifts in the range 0.5 < z < 4.4 for the 29 sources in the sample, all but six of which are secure. We find that the fil tering criteria used for 6C* are very effectiv","authors_text":"Andrew J.Bunker, Chris J.Willott, Daniel Stern, Hyron Spinrad, Katherine M.Blundell, Mark Lacy, Matt J.Jarvis, Richard Saunders, Steve Eales, Steve Rawlings","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-06-07T12:17:34Z","title":"A sample of 6C radio sources designed to find objects at redshift > 4: II --- spectrophotometry and emission line properties"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0106127","kind":"arxiv","version":1},"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":"sha256:08071682193e902d2e9492447b205f4033fbac119376b0747d6be347ee64a4f5","target":"record","created_at":"2026-05-18T01:22:59Z","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":"1d4ec5c2cd0ddfc19b807437d1c30da64c594ef938ca97c48bf24df99aaea2f6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-06-07T12:17:34Z","title_canon_sha256":"4b63c71d145d9b0f4035cb12cd4705528e4ba809be2d9dad8cafa981eeaff7ca"},"schema_version":"1.0","source":{"id":"astro-ph/0106127","kind":"arxiv","version":1}},"canonical_sha256":"f9fef130cf08bb17891aa46acc20b2af7b2fe043de1dcf277babf6183f66ec84","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f9fef130cf08bb17891aa46acc20b2af7b2fe043de1dcf277babf6183f66ec84","first_computed_at":"2026-05-18T01:22:59.007695Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:59.007695Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rm3N7QcF1zmHVhxuLinLgg1Lr7lQVNSZA2BL3HsqxbDu1Jhfij38/NNewzRUY2hr1AKVA0jrgt6ZHm2YyjI8Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:59.008255Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0106127","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:08071682193e902d2e9492447b205f4033fbac119376b0747d6be347ee64a4f5","sha256:b9299bd58aebd19f48b976a194c06ee62de0ac0fcff26b5cbd981611ba5c19e6"],"state_sha256":"f012189e61d9cc7c93af746820498a20ba69ead077054894de565912b776f9e4"}