{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:DQ7G3COXJPEGJ3MTY7L4GMSIIT","short_pith_number":"pith:DQ7G3COX","canonical_record":{"source":{"id":"astro-ph/0605425","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-17T19:29:41Z","cross_cats_sorted":[],"title_canon_sha256":"3f289458056d4592b484af837f6da3be72292fede5d71ad9ab0b82a4bf83a173","abstract_canon_sha256":"d78ac69f97034ff2b6384d70dcdaf37102878fbbb01fcc8aab47b841cdf27ecf"},"schema_version":"1.0"},"canonical_sha256":"1c3e6d89d74bc864ed93c7d7c3324844f8ef4b34d65a0651cbc62316e50903ba","source":{"kind":"arxiv","id":"astro-ph/0605425","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0605425","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0605425v3","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0605425","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_12","alias_value":"DQ7G3COXJPEG","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_16","alias_value":"DQ7G3COXJPEGJ3MT","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_8","alias_value":"DQ7G3COX","created_at":"2026-07-04T15:38:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:DQ7G3COXJPEGJ3MTY7L4GMSIIT","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0605425","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-17T19:29:41Z","cross_cats_sorted":[],"title_canon_sha256":"3f289458056d4592b484af837f6da3be72292fede5d71ad9ab0b82a4bf83a173","abstract_canon_sha256":"d78ac69f97034ff2b6384d70dcdaf37102878fbbb01fcc8aab47b841cdf27ecf"},"schema_version":"1.0"},"canonical_sha256":"1c3e6d89d74bc864ed93c7d7c3324844f8ef4b34d65a0651cbc62316e50903ba","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:38:44.779441Z","signature_b64":"naVIE4N5Dk2NVC4U07rFXRaQ8uyihdWL27Tv+s/PD3qtBfkdaB8KW53lt9Tw+8aXYQmmg6J6FEUkk0VC5v8RAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1c3e6d89d74bc864ed93c7d7c3324844f8ef4b34d65a0651cbc62316e50903ba","last_reissued_at":"2026-07-04T15:38:44.779009Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:38:44.779009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0605425","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:38:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"seX56q8PpNuXcRVskJu8qXmtYy2Tsoql6QQ9UX3iADdSjZzgjbCrdPb92/4yijvRYwkTfA+ZBKDmvYcPnE4uCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T12:40:18.089216Z"},"content_sha256":"ad7a87907bde6734f089814a476ae60f5310db281878a3a01a839f5380a01b25","schema_version":"1.0","event_id":"sha256:ad7a87907bde6734f089814a476ae60f5310db281878a3a01a839f5380a01b25"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:DQ7G3COXJPEGJ3MTY7L4GMSIIT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Age and Metallicity Estimation of Spiral Galaxies Using Optical and Near-Infrared Photometry","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Guy Worthey (WSU), Hyun-chul Lee (Washington State University), Sandra M. Faber (UCSC), Scott C. Trager (Kapteyn Astronomical Institute)","submitted_at":"2006-05-17T19:29:41Z","abstract_excerpt":"In integrated-light, some color-color diagrams that use optical and near-infrared photometry show surprisingly orthogonal grids as age and metallicity are varied, and they are coming into common usage for estimating the average age and metallicity of spiral galaxies. In this paper we reconstruct these composite grids using simple stellar population models from several different groups convolved with some plausible functional forms of star formation histories at fixed metallicity. We find that the youngest populations present (t<2 Gyr) dominate the light, and because of their presence the age-m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0605425","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0605425/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T15:38:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I+PAygDMrSx1kIh596/2MX9OZ+5Rvfi6P1l6XGokSIe4CqbmgbivrPy81g6N1Qexx5AVYXCnWTGhuzBMUVE6CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T12:40:18.089539Z"},"content_sha256":"0aeafcadf19a0a7bfadf521e5f1b91b382bf5b230be58637e323216d4ced3b18","schema_version":"1.0","event_id":"sha256:0aeafcadf19a0a7bfadf521e5f1b91b382bf5b230be58637e323216d4ced3b18"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/bundle.json","state_url":"https://pith.science/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/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":"2026-08-11T12:40:18Z","links":{"resolver":"https://pith.science/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT","bundle":"https://pith.science/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/bundle.json","state":"https://pith.science/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DQ7G3COXJPEGJ3MTY7L4GMSIIT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:DQ7G3COXJPEGJ3MTY7L4GMSIIT","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":"d78ac69f97034ff2b6384d70dcdaf37102878fbbb01fcc8aab47b841cdf27ecf","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-17T19:29:41Z","title_canon_sha256":"3f289458056d4592b484af837f6da3be72292fede5d71ad9ab0b82a4bf83a173"},"schema_version":"1.0","source":{"id":"astro-ph/0605425","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0605425","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0605425v3","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0605425","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_12","alias_value":"DQ7G3COXJPEG","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_16","alias_value":"DQ7G3COXJPEGJ3MT","created_at":"2026-07-04T15:38:44Z"},{"alias_kind":"pith_short_8","alias_value":"DQ7G3COX","created_at":"2026-07-04T15:38:44Z"}],"graph_snapshots":[{"event_id":"sha256:0aeafcadf19a0a7bfadf521e5f1b91b382bf5b230be58637e323216d4ced3b18","target":"graph","created_at":"2026-07-04T15:38:44Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0605425/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In integrated-light, some color-color diagrams that use optical and near-infrared photometry show surprisingly orthogonal grids as age and metallicity are varied, and they are coming into common usage for estimating the average age and metallicity of spiral galaxies. In this paper we reconstruct these composite grids using simple stellar population models from several different groups convolved with some plausible functional forms of star formation histories at fixed metallicity. We find that the youngest populations present (t<2 Gyr) dominate the light, and because of their presence the age-m","authors_text":"Guy Worthey (WSU), Hyun-chul Lee (Washington State University), Sandra M. Faber (UCSC), Scott C. Trager (Kapteyn Astronomical Institute)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-05-17T19:29:41Z","title":"On the Age and Metallicity Estimation of Spiral Galaxies Using Optical and Near-Infrared Photometry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0605425","kind":"arxiv","version":3},"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:ad7a87907bde6734f089814a476ae60f5310db281878a3a01a839f5380a01b25","target":"record","created_at":"2026-07-04T15:38:44Z","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":"d78ac69f97034ff2b6384d70dcdaf37102878fbbb01fcc8aab47b841cdf27ecf","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-17T19:29:41Z","title_canon_sha256":"3f289458056d4592b484af837f6da3be72292fede5d71ad9ab0b82a4bf83a173"},"schema_version":"1.0","source":{"id":"astro-ph/0605425","kind":"arxiv","version":3}},"canonical_sha256":"1c3e6d89d74bc864ed93c7d7c3324844f8ef4b34d65a0651cbc62316e50903ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1c3e6d89d74bc864ed93c7d7c3324844f8ef4b34d65a0651cbc62316e50903ba","first_computed_at":"2026-07-04T15:38:44.779009Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:38:44.779009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"naVIE4N5Dk2NVC4U07rFXRaQ8uyihdWL27Tv+s/PD3qtBfkdaB8KW53lt9Tw+8aXYQmmg6J6FEUkk0VC5v8RAA==","signature_status":"signed_v1","signed_at":"2026-07-04T15:38:44.779441Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0605425","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ad7a87907bde6734f089814a476ae60f5310db281878a3a01a839f5380a01b25","sha256:0aeafcadf19a0a7bfadf521e5f1b91b382bf5b230be58637e323216d4ced3b18"],"state_sha256":"812ad00eef5af2b04a37fe5faeeb57f5f3087d63334878b56023fd5ceb975e17"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rc9lLWob+l0rBvNjWZJvEsKDXRCuT6A/yc/oLEus6vZwZClzxoDxABleMoS0bJBId44BB/RtHg1OoNVgvkD7AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T12:40:18.091928Z","bundle_sha256":"fedf8ad30a6d66bb0234a349dd2432c9966f6dca22610f31d79cb0ffde364e86"}}