{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:EWQ2DWET5WZE4B64DBIXLBGMFR","short_pith_number":"pith:EWQ2DWET","canonical_record":{"source":{"id":"1207.4489","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-07-18T20:03:23Z","cross_cats_sorted":[],"title_canon_sha256":"a29627bcfe06b1ef8a98fd3c8a3cbe9db737b589926bf0eb76533dcfe72911dc","abstract_canon_sha256":"8bccbd63b3b0f93715af4a51c6ed6e1d22ef8fac163cee87bbc7b75705827b85"},"schema_version":"1.0"},"canonical_sha256":"25a1a1d893edb24e07dc18517584cc2c55841d2da1f08fecfe94df39f8be19ff","source":{"kind":"arxiv","id":"1207.4489","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.4489","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"arxiv_version","alias_value":"1207.4489v1","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.4489","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"pith_short_12","alias_value":"EWQ2DWET5WZE","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EWQ2DWET5WZE4B64","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EWQ2DWET","created_at":"2026-05-18T12:27:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:EWQ2DWET5WZE4B64DBIXLBGMFR","target":"record","payload":{"canonical_record":{"source":{"id":"1207.4489","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-07-18T20:03:23Z","cross_cats_sorted":[],"title_canon_sha256":"a29627bcfe06b1ef8a98fd3c8a3cbe9db737b589926bf0eb76533dcfe72911dc","abstract_canon_sha256":"8bccbd63b3b0f93715af4a51c6ed6e1d22ef8fac163cee87bbc7b75705827b85"},"schema_version":"1.0"},"canonical_sha256":"25a1a1d893edb24e07dc18517584cc2c55841d2da1f08fecfe94df39f8be19ff","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:56:16.601775Z","signature_b64":"pa70m2+NnEZTso3wTDbNI4/EPRqmoyyP4g+BzaQMTDmdERwy4ZixOc84t38bHBGkEbK/44DnJWdQbL85EmeZCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"25a1a1d893edb24e07dc18517584cc2c55841d2da1f08fecfe94df39f8be19ff","last_reissued_at":"2026-05-18T01:56:16.601221Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:56:16.601221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.4489","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":"2026-05-18T01:56:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DHCaeaXEfREZ5fPsCFYZ63fpziE0ctUG9GrQhQNBrv5shVbQogC4LFa1hWCBJEyXOKaKmX+/rISER49K0xd3Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T03:29:16.893462Z"},"content_sha256":"b8aa3889fa328a020ee5467ea9e34579f4fe6da2107dc6742a53f4669bd787ff","schema_version":"1.0","event_id":"sha256:b8aa3889fa328a020ee5467ea9e34579f4fe6da2107dc6742a53f4669bd787ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:EWQ2DWET5WZE4B64DBIXLBGMFR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Origin and Evolution of Metallicity Gradients: Probing the Mode of Mass Assembly at z=2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Eric Jullo, Johan Richard, Richard S. Ellis, Tucker Jones","submitted_at":"2012-07-18T20:03:23Z","abstract_excerpt":"We present and discuss measurements of the gas-phase metallicity gradient in gravitationally lensed galaxies at z=2.0-2.4 based on adaptive optics-assisted imaging spectroscopy with the Keck II telescope. Through deep exposures we have secured high signal to noise data for four galaxies with well-understood kinematic properties. Three galaxies with well-ordered rotation reveal metallicity gradients in the sense of having lower gas-phase metallicities at larger galactocentric radii. Two of these display gradients much steeper than found locally, while a third has one similar to that seen in loc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.4489","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":"2026-05-18T01:56:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fBYhQB1VGDQpWJE2cOS8Oysh5nEE1wTAbEUVdbktScP7tv9IEWam2x0X9TapPf/r5btmKHhBgtr4SWW1bXeqBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T03:29:16.893815Z"},"content_sha256":"5a13db2c9fe3683d96e0c1f8389934c15f34d7d567211292334beb68fbd74e1a","schema_version":"1.0","event_id":"sha256:5a13db2c9fe3683d96e0c1f8389934c15f34d7d567211292334beb68fbd74e1a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/bundle.json","state_url":"https://pith.science/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/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":"2026-06-03T03:29:16Z","links":{"resolver":"https://pith.science/pith/EWQ2DWET5WZE4B64DBIXLBGMFR","bundle":"https://pith.science/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/bundle.json","state":"https://pith.science/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EWQ2DWET5WZE4B64DBIXLBGMFR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:EWQ2DWET5WZE4B64DBIXLBGMFR","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":"8bccbd63b3b0f93715af4a51c6ed6e1d22ef8fac163cee87bbc7b75705827b85","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-07-18T20:03:23Z","title_canon_sha256":"a29627bcfe06b1ef8a98fd3c8a3cbe9db737b589926bf0eb76533dcfe72911dc"},"schema_version":"1.0","source":{"id":"1207.4489","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.4489","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"arxiv_version","alias_value":"1207.4489v1","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.4489","created_at":"2026-05-18T01:56:16Z"},{"alias_kind":"pith_short_12","alias_value":"EWQ2DWET5WZE","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EWQ2DWET5WZE4B64","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EWQ2DWET","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:5a13db2c9fe3683d96e0c1f8389934c15f34d7d567211292334beb68fbd74e1a","target":"graph","created_at":"2026-05-18T01:56:16Z","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":"We present and discuss measurements of the gas-phase metallicity gradient in gravitationally lensed galaxies at z=2.0-2.4 based on adaptive optics-assisted imaging spectroscopy with the Keck II telescope. Through deep exposures we have secured high signal to noise data for four galaxies with well-understood kinematic properties. Three galaxies with well-ordered rotation reveal metallicity gradients in the sense of having lower gas-phase metallicities at larger galactocentric radii. Two of these display gradients much steeper than found locally, while a third has one similar to that seen in loc","authors_text":"Eric Jullo, Johan Richard, Richard S. Ellis, Tucker Jones","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-07-18T20:03:23Z","title":"The Origin and Evolution of Metallicity Gradients: Probing the Mode of Mass Assembly at z=2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.4489","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:b8aa3889fa328a020ee5467ea9e34579f4fe6da2107dc6742a53f4669bd787ff","target":"record","created_at":"2026-05-18T01:56:16Z","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":"8bccbd63b3b0f93715af4a51c6ed6e1d22ef8fac163cee87bbc7b75705827b85","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-07-18T20:03:23Z","title_canon_sha256":"a29627bcfe06b1ef8a98fd3c8a3cbe9db737b589926bf0eb76533dcfe72911dc"},"schema_version":"1.0","source":{"id":"1207.4489","kind":"arxiv","version":1}},"canonical_sha256":"25a1a1d893edb24e07dc18517584cc2c55841d2da1f08fecfe94df39f8be19ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"25a1a1d893edb24e07dc18517584cc2c55841d2da1f08fecfe94df39f8be19ff","first_computed_at":"2026-05-18T01:56:16.601221Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:16.601221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pa70m2+NnEZTso3wTDbNI4/EPRqmoyyP4g+BzaQMTDmdERwy4ZixOc84t38bHBGkEbK/44DnJWdQbL85EmeZCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:16.601775Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.4489","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8aa3889fa328a020ee5467ea9e34579f4fe6da2107dc6742a53f4669bd787ff","sha256:5a13db2c9fe3683d96e0c1f8389934c15f34d7d567211292334beb68fbd74e1a"],"state_sha256":"ff3e48d6dbd76b19abfcb9ca6dc61efbbee51da9f8c1e3c8d3ea1ac5e1fae279"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZyZvMNXUcyz9qtt1ksNaWdRgxpdPkRPSmKJp14yw4uINBpaw5b7T12kGD0b153QrAaTCuk9HmdX2gQwcAfTrAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T03:29:16.895774Z","bundle_sha256":"95a77329bda2f41cc66916133367165421306a509f8421b263801a922fd41efe"}}