{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:NUV6K67TDD37RBWQO3SJMTRB4I","short_pith_number":"pith:NUV6K67T","canonical_record":{"source":{"id":"1801.02605","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-08T18:33:45Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"07201899e111bcb055fe4de83aa550755761ceabbd923e064c5c063c9362c1a7","abstract_canon_sha256":"304085034954181da6a89285a0772e558be61d14804511ec2b6bd73b9afe50e5"},"schema_version":"1.0"},"canonical_sha256":"6d2be57bf318f7f886d076e4964e21e23c4e78adf6ab282c83d445f719f19f48","source":{"kind":"arxiv","id":"1801.02605","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.02605","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"arxiv_version","alias_value":"1801.02605v1","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.02605","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"pith_short_12","alias_value":"NUV6K67TDD37","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NUV6K67TDD37RBWQ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NUV6K67T","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:NUV6K67TDD37RBWQO3SJMTRB4I","target":"record","payload":{"canonical_record":{"source":{"id":"1801.02605","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-08T18:33:45Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"07201899e111bcb055fe4de83aa550755761ceabbd923e064c5c063c9362c1a7","abstract_canon_sha256":"304085034954181da6a89285a0772e558be61d14804511ec2b6bd73b9afe50e5"},"schema_version":"1.0"},"canonical_sha256":"6d2be57bf318f7f886d076e4964e21e23c4e78adf6ab282c83d445f719f19f48","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:40.820448Z","signature_b64":"YKBxNbxtduReF7WA1srbAsiqhYWtZkAwYk3dxw4IxzcWHhy+nE9l5UVQ/sTid9F/UXJwNX8+5IU1G1R7VfIpCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6d2be57bf318f7f886d076e4964e21e23c4e78adf6ab282c83d445f719f19f48","last_reissued_at":"2026-05-18T00:06:40.820047Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:40.820047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.02605","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fNCKN6GLTw4SDqWWRlKGF8IynnIigJXLXoSAiYengcn5W7DClNW8KsNc8ECPrtrpeyE0+s2jyhur19Y/pc/FAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T19:11:05.717295Z"},"content_sha256":"e25481965dffc4f253e6c49afc4da65ae28f2fcec558370e7f86e578ae8325ac","schema_version":"1.0","event_id":"sha256:e25481965dffc4f253e6c49afc4da65ae28f2fcec558370e7f86e578ae8325ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:NUV6K67TDD37RBWQO3SJMTRB4I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A metal-line strength indicator for Damped Lyman Alpha (DLA) systems at low signal-to-noise","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Andreu Arinyo-i-Prats, Ignasi Perez-Rafols, Jordi Miralda-Escude, Lluis Mas-Ribas, Pasquier Noterdaeme","submitted_at":"2018-01-08T18:33:45Z","abstract_excerpt":"The Baryon Oscillation Spectroscopic Survey of SDSS-III has provided an unprecedentedly large sample of Damped \\lya systems (DLAs), the largest repositories of neutral hydrogen in the Universe. This DLA sample has been used to determine the DLA bias factor from their cross-correlation with the \\lya forest absorption in \\cite{FontRibera2012,Perez2018}, showing that DLAs are associated with relatively massive halos. However, the low resolution and signal-to-noise of BOSS spectra do not allow precise measurements of the DLA metal lines. We define a metal strength parameter, $S$, based on combinin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.02605","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oWD5rHZQJktK0auchlJoarUzUntkV8yeWAp6wjlpVInbMiqG6tJTmvpsXFJjk1XSEPA1BL15EltUmI6MnredCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T19:11:05.717967Z"},"content_sha256":"5bb5dae63e43d288c926059f3e90a47075de72d5e6d090825df3761d37324da8","schema_version":"1.0","event_id":"sha256:5bb5dae63e43d288c926059f3e90a47075de72d5e6d090825df3761d37324da8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NUV6K67TDD37RBWQO3SJMTRB4I/bundle.json","state_url":"https://pith.science/pith/NUV6K67TDD37RBWQO3SJMTRB4I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NUV6K67TDD37RBWQO3SJMTRB4I/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-29T19:11:05Z","links":{"resolver":"https://pith.science/pith/NUV6K67TDD37RBWQO3SJMTRB4I","bundle":"https://pith.science/pith/NUV6K67TDD37RBWQO3SJMTRB4I/bundle.json","state":"https://pith.science/pith/NUV6K67TDD37RBWQO3SJMTRB4I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NUV6K67TDD37RBWQO3SJMTRB4I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:NUV6K67TDD37RBWQO3SJMTRB4I","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":"304085034954181da6a89285a0772e558be61d14804511ec2b6bd73b9afe50e5","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-08T18:33:45Z","title_canon_sha256":"07201899e111bcb055fe4de83aa550755761ceabbd923e064c5c063c9362c1a7"},"schema_version":"1.0","source":{"id":"1801.02605","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.02605","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"arxiv_version","alias_value":"1801.02605v1","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.02605","created_at":"2026-05-18T00:06:40Z"},{"alias_kind":"pith_short_12","alias_value":"NUV6K67TDD37","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"NUV6K67TDD37RBWQ","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"NUV6K67T","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:5bb5dae63e43d288c926059f3e90a47075de72d5e6d090825df3761d37324da8","target":"graph","created_at":"2026-05-18T00:06:40Z","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":"The Baryon Oscillation Spectroscopic Survey of SDSS-III has provided an unprecedentedly large sample of Damped \\lya systems (DLAs), the largest repositories of neutral hydrogen in the Universe. This DLA sample has been used to determine the DLA bias factor from their cross-correlation with the \\lya forest absorption in \\cite{FontRibera2012,Perez2018}, showing that DLAs are associated with relatively massive halos. However, the low resolution and signal-to-noise of BOSS spectra do not allow precise measurements of the DLA metal lines. We define a metal strength parameter, $S$, based on combinin","authors_text":"Andreu Arinyo-i-Prats, Ignasi Perez-Rafols, Jordi Miralda-Escude, Lluis Mas-Ribas, Pasquier Noterdaeme","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-08T18:33:45Z","title":"A metal-line strength indicator for Damped Lyman Alpha (DLA) systems at low signal-to-noise"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.02605","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:e25481965dffc4f253e6c49afc4da65ae28f2fcec558370e7f86e578ae8325ac","target":"record","created_at":"2026-05-18T00:06:40Z","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":"304085034954181da6a89285a0772e558be61d14804511ec2b6bd73b9afe50e5","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-01-08T18:33:45Z","title_canon_sha256":"07201899e111bcb055fe4de83aa550755761ceabbd923e064c5c063c9362c1a7"},"schema_version":"1.0","source":{"id":"1801.02605","kind":"arxiv","version":1}},"canonical_sha256":"6d2be57bf318f7f886d076e4964e21e23c4e78adf6ab282c83d445f719f19f48","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6d2be57bf318f7f886d076e4964e21e23c4e78adf6ab282c83d445f719f19f48","first_computed_at":"2026-05-18T00:06:40.820047Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:40.820047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YKBxNbxtduReF7WA1srbAsiqhYWtZkAwYk3dxw4IxzcWHhy+nE9l5UVQ/sTid9F/UXJwNX8+5IU1G1R7VfIpCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:40.820448Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.02605","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e25481965dffc4f253e6c49afc4da65ae28f2fcec558370e7f86e578ae8325ac","sha256:5bb5dae63e43d288c926059f3e90a47075de72d5e6d090825df3761d37324da8"],"state_sha256":"cd75ca235358c210578489f03e1db450c0c7024201bc545e96464f7836cd6ec8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n373Ug980k1KHYyffcfmAoxbXNbaoIvLQOvfNiuoOTmgmx/CzYP339xglFZIDNjBDdYV/SygfxhJz88Q0fVjDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T19:11:05.722170Z","bundle_sha256":"2da6bd63803e1010a5787678d322ea9dcfa402c5526b5aa81a5592e8c916451a"}}