{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2005:YZ7E4BS4JEEZTSDD6EXH6T4QQ7","short_pith_number":"pith:YZ7E4BS4","canonical_record":{"source":{"id":"astro-ph/0501355","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-17T21:11:11Z","cross_cats_sorted":[],"title_canon_sha256":"b7cc183248bbd206464d3af4480a84ce437c0ff871e1cfe99de951408021bc89","abstract_canon_sha256":"6e8f9e4282c1bc7d81b99770a5ecaadec56da8620ac31044f05fd5ba8eaeffe3"},"schema_version":"1.0"},"canonical_sha256":"c67e4e065c490999c863f12e7f4f9087cac8e3b12587f8b4ef491aad1344e011","source":{"kind":"arxiv","id":"astro-ph/0501355","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0501355","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0501355v1","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0501355","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"pith_short_12","alias_value":"YZ7E4BS4JEEZ","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"YZ7E4BS4JEEZTSDD","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"YZ7E4BS4","created_at":"2026-05-18T12:25:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2005:YZ7E4BS4JEEZTSDD6EXH6T4QQ7","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0501355","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-17T21:11:11Z","cross_cats_sorted":[],"title_canon_sha256":"b7cc183248bbd206464d3af4480a84ce437c0ff871e1cfe99de951408021bc89","abstract_canon_sha256":"6e8f9e4282c1bc7d81b99770a5ecaadec56da8620ac31044f05fd5ba8eaeffe3"},"schema_version":"1.0"},"canonical_sha256":"c67e4e065c490999c863f12e7f4f9087cac8e3b12587f8b4ef491aad1344e011","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:27:04.343946Z","signature_b64":"ch69TVpYsWk0fgtsiqHAmTO1a13jtP7o7voIXKrVnXpEXRQUfPDkXYOnVyE/SFu4EH/tFL7t7jA4T3AVxRokDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c67e4e065c490999c863f12e7f4f9087cac8e3b12587f8b4ef491aad1344e011","last_reissued_at":"2026-05-18T04:27:04.343158Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:27:04.343158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0501355","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":"2026-05-18T04:27:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v95+LINTZfJqgt/l8RnOfmrR13NwxWW3tPe5L7qNyIksTYm2eyHYWk8ZYSUokHBNgV+XskfceGnLGWUYsBGzBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:28:46.752609Z"},"content_sha256":"1638f54fccffaf3d2118f1019143fe982721044aa638a0b57ee5f20437958d12","schema_version":"1.0","event_id":"sha256:1638f54fccffaf3d2118f1019143fe982721044aa638a0b57ee5f20437958d12"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2005:YZ7E4BS4JEEZTSDD6EXH6T4QQ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar abundance gradients in galactic disks. I. Method and spectral line gradients","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) Swinburne University), B. K. Gibson (2) ((1) AAO, S. D. Ryder (1), Y. Fenner (2)","submitted_at":"2005-01-17T21:11:11Z","abstract_excerpt":"We describe the technique of absorption line imaging of galaxy disks using the Taurus Tunable Filter on the Anglo-Australian Telescope and demonstrate its sensitivity to the behaviour of spectral features associated with Mg and Fe. Radial profiles of Mg2 and Fe5270 line-strengths are presented for a sample of eight face-on spiral galaxies spanning a range of Hubble types. Signatures of phenomena including merger-induced star formation, HII rings and galactic bars are also reported. This study demonstrates the capacity of tunable filters to measure Mg and Fe line-strengths across the face of sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0501355","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":"2026-05-18T04:27:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ha0ichnzWWYoJhIvphpZMZnP7DyNX2OTsigb9KGr18FK7TwQWH+Rb0mZHVY8jTTnSeKAAg8tifYU2jiWfA9DDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:28:46.753235Z"},"content_sha256":"0e73698581a27ef780ec446ea3c5e97630a0d3241e7543779f9f0e4c6f824a22","schema_version":"1.0","event_id":"sha256:0e73698581a27ef780ec446ea3c5e97630a0d3241e7543779f9f0e4c6f824a22"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/bundle.json","state_url":"https://pith.science/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/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":"2026-05-31T21:28:46Z","links":{"resolver":"https://pith.science/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7","bundle":"https://pith.science/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/bundle.json","state":"https://pith.science/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YZ7E4BS4JEEZTSDD6EXH6T4QQ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:YZ7E4BS4JEEZTSDD6EXH6T4QQ7","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":"6e8f9e4282c1bc7d81b99770a5ecaadec56da8620ac31044f05fd5ba8eaeffe3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-17T21:11:11Z","title_canon_sha256":"b7cc183248bbd206464d3af4480a84ce437c0ff871e1cfe99de951408021bc89"},"schema_version":"1.0","source":{"id":"astro-ph/0501355","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0501355","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0501355v1","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0501355","created_at":"2026-05-18T04:27:04Z"},{"alias_kind":"pith_short_12","alias_value":"YZ7E4BS4JEEZ","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"YZ7E4BS4JEEZTSDD","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"YZ7E4BS4","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:0e73698581a27ef780ec446ea3c5e97630a0d3241e7543779f9f0e4c6f824a22","target":"graph","created_at":"2026-05-18T04:27:04Z","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 describe the technique of absorption line imaging of galaxy disks using the Taurus Tunable Filter on the Anglo-Australian Telescope and demonstrate its sensitivity to the behaviour of spectral features associated with Mg and Fe. Radial profiles of Mg2 and Fe5270 line-strengths are presented for a sample of eight face-on spiral galaxies spanning a range of Hubble types. Signatures of phenomena including merger-induced star formation, HII rings and galactic bars are also reported. This study demonstrates the capacity of tunable filters to measure Mg and Fe line-strengths across the face of sp","authors_text":"(2) Swinburne University), B. K. Gibson (2) ((1) AAO, S. D. Ryder (1), Y. Fenner (2)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-01-17T21:11:11Z","title":"Stellar abundance gradients in galactic disks. I. Method and spectral line gradients"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0501355","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":"sha256:1638f54fccffaf3d2118f1019143fe982721044aa638a0b57ee5f20437958d12","target":"record","created_at":"2026-05-18T04:27:04Z","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":"6e8f9e4282c1bc7d81b99770a5ecaadec56da8620ac31044f05fd5ba8eaeffe3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-01-17T21:11:11Z","title_canon_sha256":"b7cc183248bbd206464d3af4480a84ce437c0ff871e1cfe99de951408021bc89"},"schema_version":"1.0","source":{"id":"astro-ph/0501355","kind":"arxiv","version":1}},"canonical_sha256":"c67e4e065c490999c863f12e7f4f9087cac8e3b12587f8b4ef491aad1344e011","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c67e4e065c490999c863f12e7f4f9087cac8e3b12587f8b4ef491aad1344e011","first_computed_at":"2026-05-18T04:27:04.343158Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:27:04.343158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ch69TVpYsWk0fgtsiqHAmTO1a13jtP7o7voIXKrVnXpEXRQUfPDkXYOnVyE/SFu4EH/tFL7t7jA4T3AVxRokDg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:27:04.343946Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0501355","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1638f54fccffaf3d2118f1019143fe982721044aa638a0b57ee5f20437958d12","sha256:0e73698581a27ef780ec446ea3c5e97630a0d3241e7543779f9f0e4c6f824a22"],"state_sha256":"38c68008f6a91c86fcc4d98cef6ad862706e847ebf10c67aff98783b0ac8fead"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uVwOiF9FRslGqqU4mzzOagCnSJd3RS40eSXacYdKJfTphygAfc8OI9XDMaM5zbQDEMvm+GDbYAEnLsS5Iq5NBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T21:28:46.756303Z","bundle_sha256":"6cfc3cd7a7c7604d1a54f9690336deaf84c1b4c091e1b278d37e8b8eb1562bb6"}}