{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:WTWYKW5IT32S2AY6AM4TKC3VMR","short_pith_number":"pith:WTWYKW5I","canonical_record":{"source":{"id":"1208.1756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-08-08T19:59:35Z","cross_cats_sorted":[],"title_canon_sha256":"078e3242bdd6578f8548740059a3df79b9f21cfcf9b938b32eb85f5b5ff4dac1","abstract_canon_sha256":"2fc110169ee939b64e79c87e2677995c8773b513c28f179d2f2342f700cf0e21"},"schema_version":"1.0"},"canonical_sha256":"b4ed855ba89ef52d031e0339350b75644d3ee4374f6433b450f7f693bc8d3fba","source":{"kind":"arxiv","id":"1208.1756","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.1756","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"arxiv_version","alias_value":"1208.1756v1","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.1756","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"pith_short_12","alias_value":"WTWYKW5IT32S","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"WTWYKW5IT32S2AY6","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"WTWYKW5I","created_at":"2026-05-18T12:27:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:WTWYKW5IT32S2AY6AM4TKC3VMR","target":"record","payload":{"canonical_record":{"source":{"id":"1208.1756","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-08-08T19:59:35Z","cross_cats_sorted":[],"title_canon_sha256":"078e3242bdd6578f8548740059a3df79b9f21cfcf9b938b32eb85f5b5ff4dac1","abstract_canon_sha256":"2fc110169ee939b64e79c87e2677995c8773b513c28f179d2f2342f700cf0e21"},"schema_version":"1.0"},"canonical_sha256":"b4ed855ba89ef52d031e0339350b75644d3ee4374f6433b450f7f693bc8d3fba","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:17.444681Z","signature_b64":"HVVVlJujMYD9MOQn/SUnZmBO5BjKdGq9t/Opbkp5IRcJ/Gagm1ZaMkX2GunIVFf+RL78ygzNRLS7r83I0WmYBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4ed855ba89ef52d031e0339350b75644d3ee4374f6433b450f7f693bc8d3fba","last_reissued_at":"2026-05-18T01:55:17.444151Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:17.444151Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.1756","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":"2026-05-18T01:55:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"47nbN00VOPgxyezmjRc4BdjdmSxPqiv8S5nDtiaYCLDh295O9L8HTWDfkquk3z+uWvZe0WicyKi585jGjy71Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:08:05.660425Z"},"content_sha256":"7bde788597605505ea23b0664ddaf94cd4c446ec6e3f2e053127344a8ea9c35c","schema_version":"1.0","event_id":"sha256:7bde788597605505ea23b0664ddaf94cd4c446ec6e3f2e053127344a8ea9c35c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:WTWYKW5IT32S2AY6AM4TKC3VMR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The star formation histories of Hickson compact group galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) Depto. de Astronomia de la Univ. de Guanajuato, A. Del Olmo (1), IAA-CSIC, I. Plauchu-Frayn (1), J. P. Torres-Papaqui (2) ((1) Instituto de Astrofisica de Andalucia, Mexico), R. Coziol (2), Spain","submitted_at":"2012-08-08T19:59:35Z","abstract_excerpt":"ABRIDGED: We study the Star Formation History (SFH) of 210 galaxies members of 55 Hickson Compact Groups (HCG) and 309 galaxies from the Catalog of Isolated Galaxies (CIG). The SFH traces the variation of star formation over the lifetime of a galaxy, and yields consequently a snapshot picture of its formation. Comparing the SFHs in these extremes in galaxy density, allows us to determine the main effects of Compact Groups (CG) on the formation of galaxies. We fit our spectra using the spectral synthesis code STARLIGHT and obtain the stellar population contents and mean stellar ages of HCG and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.1756","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":"2026-05-18T01:55:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iuphEWmWdmhu2xzARM828c0KKsdYnkS0L7o+i4wM9n6uSRyzKBafmGF0fcMwVDdW6C+fRWkNz+GcADhzNknbAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T08:08:05.661110Z"},"content_sha256":"a1c811ec939f4f487faf3b8bb18b2d7789011a2532e44456651bd0aa77e43acc","schema_version":"1.0","event_id":"sha256:a1c811ec939f4f487faf3b8bb18b2d7789011a2532e44456651bd0aa77e43acc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/bundle.json","state_url":"https://pith.science/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/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":"2026-05-27T08:08:05Z","links":{"resolver":"https://pith.science/pith/WTWYKW5IT32S2AY6AM4TKC3VMR","bundle":"https://pith.science/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/bundle.json","state":"https://pith.science/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WTWYKW5IT32S2AY6AM4TKC3VMR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:WTWYKW5IT32S2AY6AM4TKC3VMR","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":"2fc110169ee939b64e79c87e2677995c8773b513c28f179d2f2342f700cf0e21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-08-08T19:59:35Z","title_canon_sha256":"078e3242bdd6578f8548740059a3df79b9f21cfcf9b938b32eb85f5b5ff4dac1"},"schema_version":"1.0","source":{"id":"1208.1756","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.1756","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"arxiv_version","alias_value":"1208.1756v1","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.1756","created_at":"2026-05-18T01:55:17Z"},{"alias_kind":"pith_short_12","alias_value":"WTWYKW5IT32S","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"WTWYKW5IT32S2AY6","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"WTWYKW5I","created_at":"2026-05-18T12:27:27Z"}],"graph_snapshots":[{"event_id":"sha256:a1c811ec939f4f487faf3b8bb18b2d7789011a2532e44456651bd0aa77e43acc","target":"graph","created_at":"2026-05-18T01:55:17Z","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":"ABRIDGED: We study the Star Formation History (SFH) of 210 galaxies members of 55 Hickson Compact Groups (HCG) and 309 galaxies from the Catalog of Isolated Galaxies (CIG). The SFH traces the variation of star formation over the lifetime of a galaxy, and yields consequently a snapshot picture of its formation. Comparing the SFHs in these extremes in galaxy density, allows us to determine the main effects of Compact Groups (CG) on the formation of galaxies. We fit our spectra using the spectral synthesis code STARLIGHT and obtain the stellar population contents and mean stellar ages of HCG and ","authors_text":"(2) Depto. de Astronomia de la Univ. de Guanajuato, A. Del Olmo (1), IAA-CSIC, I. Plauchu-Frayn (1), J. P. Torres-Papaqui (2) ((1) Instituto de Astrofisica de Andalucia, Mexico), R. Coziol (2), Spain","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-08-08T19:59:35Z","title":"The star formation histories of Hickson compact group galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.1756","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":"sha256:7bde788597605505ea23b0664ddaf94cd4c446ec6e3f2e053127344a8ea9c35c","target":"record","created_at":"2026-05-18T01:55:17Z","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":"2fc110169ee939b64e79c87e2677995c8773b513c28f179d2f2342f700cf0e21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-08-08T19:59:35Z","title_canon_sha256":"078e3242bdd6578f8548740059a3df79b9f21cfcf9b938b32eb85f5b5ff4dac1"},"schema_version":"1.0","source":{"id":"1208.1756","kind":"arxiv","version":1}},"canonical_sha256":"b4ed855ba89ef52d031e0339350b75644d3ee4374f6433b450f7f693bc8d3fba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4ed855ba89ef52d031e0339350b75644d3ee4374f6433b450f7f693bc8d3fba","first_computed_at":"2026-05-18T01:55:17.444151Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:55:17.444151Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HVVVlJujMYD9MOQn/SUnZmBO5BjKdGq9t/Opbkp5IRcJ/Gagm1ZaMkX2GunIVFf+RL78ygzNRLS7r83I0WmYBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:55:17.444681Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.1756","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bde788597605505ea23b0664ddaf94cd4c446ec6e3f2e053127344a8ea9c35c","sha256:a1c811ec939f4f487faf3b8bb18b2d7789011a2532e44456651bd0aa77e43acc"],"state_sha256":"6e27ac13b2c2fccbb1d6db867cc9242f49454bb67118d0bc55e1874b15ca8781"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jZjX5NcHwBQXNXGAhBS/lBOd/Mx6+cLZ/y5tBP+dsNuk3Z6hJTiHQpgircYTu1pTv0iPn3QsAUeUVgFhfW71Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T08:08:05.667881Z","bundle_sha256":"8928b12b65d5ce954575fef6881c77c08d225e45071acbab64c42ac7d48baa88"}}