{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:YAZ6S5ILXGU73B4YBCTWUGWRAJ","short_pith_number":"pith:YAZ6S5IL","canonical_record":{"source":{"id":"1002.2013","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-10T01:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"15fb2fe7d5d5e8019f3e7557a5da44501610e52e67fea6839719936e31c82371","abstract_canon_sha256":"19755f025748a1c88f6af589e3f0cfbe015102a9a98bc27d0f3dd79b4ff76b7e"},"schema_version":"1.0"},"canonical_sha256":"c033e9750bb9a9fd879808a76a1ad102473760f55318e50447141c0c3f98e6dd","source":{"kind":"arxiv","id":"1002.2013","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2013","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2013v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2013","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"YAZ6S5ILXGU7","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YAZ6S5ILXGU73B4Y","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YAZ6S5IL","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:YAZ6S5ILXGU73B4YBCTWUGWRAJ","target":"record","payload":{"canonical_record":{"source":{"id":"1002.2013","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-10T01:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"15fb2fe7d5d5e8019f3e7557a5da44501610e52e67fea6839719936e31c82371","abstract_canon_sha256":"19755f025748a1c88f6af589e3f0cfbe015102a9a98bc27d0f3dd79b4ff76b7e"},"schema_version":"1.0"},"canonical_sha256":"c033e9750bb9a9fd879808a76a1ad102473760f55318e50447141c0c3f98e6dd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:10.431820Z","signature_b64":"beM8E8hxFvyfHRAAEyi0qZbrB7zy32UclCD808Qfm1PXaoYpoL20k2y1rMVbzKujIhRX0ijVkppcLHVp02BpDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c033e9750bb9a9fd879808a76a1ad102473760f55318e50447141c0c3f98e6dd","last_reissued_at":"2026-05-18T02:09:10.431009Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:10.431009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.2013","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":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tCgsJbXw98jiz/u3ia+UbXPjb7Zg8x6Fc1YfOTzbpo/pHvTLYyQF0CrxfFEozaoUFp1Fy5mHj1vP9rjhivghAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:30:34.060059Z"},"content_sha256":"f1b29e0d8a8e786366dad380cf2814ad2fc9155dae5a83f6e7f629f064ab6dec","schema_version":"1.0","event_id":"sha256:f1b29e0d8a8e786366dad380cf2814ad2fc9155dae5a83f6e7f629f064ab6dec"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:YAZ6S5ILXGU73B4YBCTWUGWRAJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparing six evolutionary population synthesis models through spectral synthesis on galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"F. Hammer, G. H. Zhong, H. Flores, M. Rodrigues, Ph. Prugniel, X. Y. Chen, Y. C. Liang, Y. H. Zhao","submitted_at":"2010-02-10T01:21:29Z","abstract_excerpt":"We compare six popularly used evolutionary population synthesis (EPS) models (BC03, CB07, Ma05, GALEV, GRASIL, Vazdekis/Miles) through fitting the full optical spectra of six representative types of galaxies (star-forming and composite galaxies, Seyfert 2s, LINERs, E+A and early-type galaxies), which are taken from the Sloan Digital Sky Survey (SDSS). Throughout our paper, we use the simple stellar populations (SSPs) from each EPS model and the software STARLIGHT to do our fits. Our main results are: Using different EPS models the resulted numerical values of contributed light fractions change"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2013","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":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W9PkHzBW6xU6Qz3xfQRG2x8+Rj/BFOF6pPPKA9HO5JOT/gglCTGIjAzSSCIE1eW3UoAYGqpqmUUaPYV6HSn7Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:30:34.060708Z"},"content_sha256":"cc8f97e097ca37f1291a6b701b17d805ce41bee43d3c11f87a7323ab3f601715","schema_version":"1.0","event_id":"sha256:cc8f97e097ca37f1291a6b701b17d805ce41bee43d3c11f87a7323ab3f601715"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/bundle.json","state_url":"https://pith.science/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/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":"2026-05-25T18:30:34Z","links":{"resolver":"https://pith.science/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ","bundle":"https://pith.science/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/bundle.json","state":"https://pith.science/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YAZ6S5ILXGU73B4YBCTWUGWRAJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:YAZ6S5ILXGU73B4YBCTWUGWRAJ","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":"19755f025748a1c88f6af589e3f0cfbe015102a9a98bc27d0f3dd79b4ff76b7e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-10T01:21:29Z","title_canon_sha256":"15fb2fe7d5d5e8019f3e7557a5da44501610e52e67fea6839719936e31c82371"},"schema_version":"1.0","source":{"id":"1002.2013","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2013","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2013v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2013","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"YAZ6S5ILXGU7","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YAZ6S5ILXGU73B4Y","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YAZ6S5IL","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:cc8f97e097ca37f1291a6b701b17d805ce41bee43d3c11f87a7323ab3f601715","target":"graph","created_at":"2026-05-18T02:09:10Z","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 compare six popularly used evolutionary population synthesis (EPS) models (BC03, CB07, Ma05, GALEV, GRASIL, Vazdekis/Miles) through fitting the full optical spectra of six representative types of galaxies (star-forming and composite galaxies, Seyfert 2s, LINERs, E+A and early-type galaxies), which are taken from the Sloan Digital Sky Survey (SDSS). Throughout our paper, we use the simple stellar populations (SSPs) from each EPS model and the software STARLIGHT to do our fits. Our main results are: Using different EPS models the resulted numerical values of contributed light fractions change","authors_text":"F. Hammer, G. H. Zhong, H. Flores, M. Rodrigues, Ph. Prugniel, X. Y. Chen, Y. C. Liang, Y. H. Zhao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-10T01:21:29Z","title":"Comparing six evolutionary population synthesis models through spectral synthesis on galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2013","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:f1b29e0d8a8e786366dad380cf2814ad2fc9155dae5a83f6e7f629f064ab6dec","target":"record","created_at":"2026-05-18T02:09:10Z","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":"19755f025748a1c88f6af589e3f0cfbe015102a9a98bc27d0f3dd79b4ff76b7e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-10T01:21:29Z","title_canon_sha256":"15fb2fe7d5d5e8019f3e7557a5da44501610e52e67fea6839719936e31c82371"},"schema_version":"1.0","source":{"id":"1002.2013","kind":"arxiv","version":1}},"canonical_sha256":"c033e9750bb9a9fd879808a76a1ad102473760f55318e50447141c0c3f98e6dd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c033e9750bb9a9fd879808a76a1ad102473760f55318e50447141c0c3f98e6dd","first_computed_at":"2026-05-18T02:09:10.431009Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:10.431009Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"beM8E8hxFvyfHRAAEyi0qZbrB7zy32UclCD808Qfm1PXaoYpoL20k2y1rMVbzKujIhRX0ijVkppcLHVp02BpDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:10.431820Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.2013","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1b29e0d8a8e786366dad380cf2814ad2fc9155dae5a83f6e7f629f064ab6dec","sha256:cc8f97e097ca37f1291a6b701b17d805ce41bee43d3c11f87a7323ab3f601715"],"state_sha256":"6a33f5d9187a23e709e546d65378fafd09d4095ad72a950cfe95f749f352c3b0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w0uyXW9hNZI4yrLHQI+qjsG7BZRCtRIFlTCBczn8Nt4HPxTcHWUU9a5hX4Ez2GCMSwbTLK8423+ki9Sif5O0Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:30:34.064308Z","bundle_sha256":"9571ed661c550d275c80c70655ce6bf8251ec4451b6db96b1a2fff72372f8f60"}}