{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:32TGLZO353W7FROHLEFLUR3OQE","short_pith_number":"pith:32TGLZO3","canonical_record":{"source":{"id":"1206.0733","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-06-04T20:00:01Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"ad893182ae9b2a01e3eeec74efd4a8ea4174e66ad96c7abbd0b263bb18205a9d","abstract_canon_sha256":"d5f3a570f3d6be268a144dc14a3a0f09e59bf466bc51e386edf999d738c39823"},"schema_version":"1.0"},"canonical_sha256":"dea665e5dbeeedf2c5c7590aba476e8115e91a2f6718e1337eba1fcbd475827e","source":{"kind":"arxiv","id":"1206.0733","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1206.0733","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1206.0733v1","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1206.0733","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"32TGLZO353W7","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"32TGLZO353W7FROH","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"32TGLZO3","created_at":"2026-05-18T12:26:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:32TGLZO353W7FROHLEFLUR3OQE","target":"record","payload":{"canonical_record":{"source":{"id":"1206.0733","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-06-04T20:00:01Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"ad893182ae9b2a01e3eeec74efd4a8ea4174e66ad96c7abbd0b263bb18205a9d","abstract_canon_sha256":"d5f3a570f3d6be268a144dc14a3a0f09e59bf466bc51e386edf999d738c39823"},"schema_version":"1.0"},"canonical_sha256":"dea665e5dbeeedf2c5c7590aba476e8115e91a2f6718e1337eba1fcbd475827e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:08.016967Z","signature_b64":"iAhxbg0XLllnopANvBUXAV7BoU5jw3sU7f2zvrD82+RscPYdi+VuXS7jXaCnMtSGU4PYuWLwVtPRKdcpmtxjCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dea665e5dbeeedf2c5c7590aba476e8115e91a2f6718e1337eba1fcbd475827e","last_reissued_at":"2026-05-18T01:57:08.016381Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:08.016381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1206.0733","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":"2026-05-18T01:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lip9i2RASlmkrZJ8DcDt28X+BWPZTnAQU0lwb/n1u2ZYSJwKbfycsGKlIKtOW5Gz7UKuzdcT5eQCDcmcOdwsDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:11:53.575410Z"},"content_sha256":"0784875aa6915fb7a7889e94b71e6e780a1b9a338338fd3edb917904b43d09fb","schema_version":"1.0","event_id":"sha256:0784875aa6915fb7a7889e94b71e6e780a1b9a338338fd3edb917904b43d09fb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:32TGLZO353W7FROHLEFLUR3OQE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Star Formation History in two fields of the Small Magellanic Cloud Bar","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"2), (2) INAF-OABO, (3) School of Mathematics, (4) STSCI, (5) University of Wisconsin, (6) Astronomisches Rechen-Institut, A. A. Cole (3), A. Nota (4) ((1) Astronomy Dept., Australia, E. K. Grebel (6), E. Sabbi (4), Germany), Italy, J. Anderson (4), J. S. Gallagher (5), M. Cignoni (1, M. Tosi (2), Physics, University of Bologna, University of Tasmania, USA, Zentrum fuer Astronomie der Universitaet Heidelberg","submitted_at":"2012-06-04T20:00:01Z","abstract_excerpt":"The Bar is the most productive region of the Small Magellanic Cloud in terms of star formation but also the least studied one. In this paper we investigate the star formation history of two fields located in the SW and in the NE portion of the Bar using two independent and well tested procedures applied to the color-magnitude diagrams of their stellar populations resolved by means of deep HST photometry. We find that the Bar experienced a negligible star formation activity in the first few Gyr, followed by a dramatic enhancement from 6 to 4 Gyr ago and a nearly constant activity since then. Th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0733","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":"2026-05-18T01:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yseJTTenR46rcbbiHVuaMtivF8ubdIWSbYp83ICb9s3OfRbonCLNuOfTf8c8vJK5u9uG6zZl6mNLu//kawG/Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:11:53.575782Z"},"content_sha256":"97f5607ac4e5147fdb97eadafc5e1cca47e2527e8c54e6580b35863f47612bcd","schema_version":"1.0","event_id":"sha256:97f5607ac4e5147fdb97eadafc5e1cca47e2527e8c54e6580b35863f47612bcd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/32TGLZO353W7FROHLEFLUR3OQE/bundle.json","state_url":"https://pith.science/pith/32TGLZO353W7FROHLEFLUR3OQE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/32TGLZO353W7FROHLEFLUR3OQE/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":"2026-06-01T20:11:53Z","links":{"resolver":"https://pith.science/pith/32TGLZO353W7FROHLEFLUR3OQE","bundle":"https://pith.science/pith/32TGLZO353W7FROHLEFLUR3OQE/bundle.json","state":"https://pith.science/pith/32TGLZO353W7FROHLEFLUR3OQE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/32TGLZO353W7FROHLEFLUR3OQE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:32TGLZO353W7FROHLEFLUR3OQE","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":"d5f3a570f3d6be268a144dc14a3a0f09e59bf466bc51e386edf999d738c39823","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-06-04T20:00:01Z","title_canon_sha256":"ad893182ae9b2a01e3eeec74efd4a8ea4174e66ad96c7abbd0b263bb18205a9d"},"schema_version":"1.0","source":{"id":"1206.0733","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1206.0733","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1206.0733v1","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1206.0733","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"32TGLZO353W7","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"32TGLZO353W7FROH","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"32TGLZO3","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:97f5607ac4e5147fdb97eadafc5e1cca47e2527e8c54e6580b35863f47612bcd","target":"graph","created_at":"2026-05-18T01:57:08Z","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":"The Bar is the most productive region of the Small Magellanic Cloud in terms of star formation but also the least studied one. In this paper we investigate the star formation history of two fields located in the SW and in the NE portion of the Bar using two independent and well tested procedures applied to the color-magnitude diagrams of their stellar populations resolved by means of deep HST photometry. We find that the Bar experienced a negligible star formation activity in the first few Gyr, followed by a dramatic enhancement from 6 to 4 Gyr ago and a nearly constant activity since then. Th","authors_text":"2), (2) INAF-OABO, (3) School of Mathematics, (4) STSCI, (5) University of Wisconsin, (6) Astronomisches Rechen-Institut, A. A. Cole (3), A. Nota (4) ((1) Astronomy Dept., Australia, E. K. Grebel (6), E. Sabbi (4), Germany), Italy, J. Anderson (4), J. S. Gallagher (5), M. Cignoni (1, M. Tosi (2), Physics, University of Bologna, University of Tasmania, USA, Zentrum fuer Astronomie der Universitaet Heidelberg","cross_cats":["astro-ph.CO","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-06-04T20:00:01Z","title":"Star Formation History in two fields of the Small Magellanic Cloud Bar"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0733","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":"sha256:0784875aa6915fb7a7889e94b71e6e780a1b9a338338fd3edb917904b43d09fb","target":"record","created_at":"2026-05-18T01:57:08Z","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":"d5f3a570f3d6be268a144dc14a3a0f09e59bf466bc51e386edf999d738c39823","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-06-04T20:00:01Z","title_canon_sha256":"ad893182ae9b2a01e3eeec74efd4a8ea4174e66ad96c7abbd0b263bb18205a9d"},"schema_version":"1.0","source":{"id":"1206.0733","kind":"arxiv","version":1}},"canonical_sha256":"dea665e5dbeeedf2c5c7590aba476e8115e91a2f6718e1337eba1fcbd475827e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dea665e5dbeeedf2c5c7590aba476e8115e91a2f6718e1337eba1fcbd475827e","first_computed_at":"2026-05-18T01:57:08.016381Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:08.016381Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iAhxbg0XLllnopANvBUXAV7BoU5jw3sU7f2zvrD82+RscPYdi+VuXS7jXaCnMtSGU4PYuWLwVtPRKdcpmtxjCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:08.016967Z","signed_message":"canonical_sha256_bytes"},"source_id":"1206.0733","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0784875aa6915fb7a7889e94b71e6e780a1b9a338338fd3edb917904b43d09fb","sha256:97f5607ac4e5147fdb97eadafc5e1cca47e2527e8c54e6580b35863f47612bcd"],"state_sha256":"169d93d488552acf9d6641db6e19deb2dbad84430d8cb105bda7e4e72b41650b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N/uIqyTJ8xSUuOGA7U++cRAKWxT3QkXSs9TCEfcnkAiY7bpbi8qBnllaj5J4TU33i0cwB7XvCD9B/MPc+8tQCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T20:11:53.577803Z","bundle_sha256":"f7e03d83448c1a08279c7948aa2e0f53a9aebd6b9a20cf6ae842f396fa6c14b2"}}