{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:WWHMD34A77RX5TKPCXCPH5HCJF","short_pith_number":"pith:WWHMD34A","canonical_record":{"source":{"id":"1008.1589","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-09T20:13:08Z","cross_cats_sorted":[],"title_canon_sha256":"6970c0133014a6c60a6b81a34f76111e198e6d43165e85cdad8cb8ba8667e822","abstract_canon_sha256":"84be8c4816f0062f40a72424ab62483d85657f894c9f425e664421867b4a1621"},"schema_version":"1.0"},"canonical_sha256":"b58ec1ef80ffe37ecd4f15c4f3f4e249538114e649f060fc7a1eaec3bc08bd24","source":{"kind":"arxiv","id":"1008.1589","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1589","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1589v1","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1589","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"pith_short_12","alias_value":"WWHMD34A77RX","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"WWHMD34A77RX5TKP","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"WWHMD34A","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:WWHMD34A77RX5TKPCXCPH5HCJF","target":"record","payload":{"canonical_record":{"source":{"id":"1008.1589","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-09T20:13:08Z","cross_cats_sorted":[],"title_canon_sha256":"6970c0133014a6c60a6b81a34f76111e198e6d43165e85cdad8cb8ba8667e822","abstract_canon_sha256":"84be8c4816f0062f40a72424ab62483d85657f894c9f425e664421867b4a1621"},"schema_version":"1.0"},"canonical_sha256":"b58ec1ef80ffe37ecd4f15c4f3f4e249538114e649f060fc7a1eaec3bc08bd24","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:50.033625Z","signature_b64":"+xR2vnD8ffkCoEeFZgtaEtIKuMl6lZSdJh+cnU9rEn1+nx4HOLKz0AX6pNdXqDdGtdLHYRBWA660bHgaPj/ODA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b58ec1ef80ffe37ecd4f15c4f3f4e249538114e649f060fc7a1eaec3bc08bd24","last_reissued_at":"2026-05-18T02:05:50.032973Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:50.032973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.1589","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":"2026-05-18T02:05:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GrIjvoU/1Hn0SaLQyVhikLpXTh6zMYsoonuDDYM8pTBakn/9M+QN5f0MGGzcWwjKm8kl7XXslx8E5EF4qV7KCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T00:51:59.193540Z"},"content_sha256":"47c4cceae10c39a26c391068b0b6cbdac2028b84c05f00a357f9f6267953e8b9","schema_version":"1.0","event_id":"sha256:47c4cceae10c39a26c391068b0b6cbdac2028b84c05f00a357f9f6267953e8b9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:WWHMD34A77RX5TKPCXCPH5HCJF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Nature of Starbursts: I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrew Dolphin, Benjamin Williams, Daniel Weisz, David Stark, Evan D. Skillman, John M. Cannon, Jon Holtzman, Julianne Dalcanton, Kristen B. W. McQuinn, Sebastian Hidalgo-Rodr\\'iguez","submitted_at":"2010-08-09T20:13:08Z","abstract_excerpt":"We use archival HST observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies. In this first paper we present the observations, color-magnitude diagrams, and the SFHs of the 18 starburst galaxies, based on a homogeneous approach to the data reduction, differential extinction, and treatment of photometric completeness. We adopt a star formation rate (SFR) threshold normalized to the average SFR of the individual system as a metric for classifying starbursts in SFHs derived from resolved stellar populations. This choice facil"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1589","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":"2026-05-18T02:05:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rWvPb1xOKTcMGpmE3FNx5mCZ9HpN1CrGrxp0icqJSP8iLEY3EfTFYLy0J8iG01hSXBWkjnxLmyQkaNeXrkkbDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T00:51:59.194179Z"},"content_sha256":"91eb8c8bb6ef2fe6b63cb6f5710511b25cc3e0ce459c018158373255e6f2c13a","schema_version":"1.0","event_id":"sha256:91eb8c8bb6ef2fe6b63cb6f5710511b25cc3e0ce459c018158373255e6f2c13a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WWHMD34A77RX5TKPCXCPH5HCJF/bundle.json","state_url":"https://pith.science/pith/WWHMD34A77RX5TKPCXCPH5HCJF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WWHMD34A77RX5TKPCXCPH5HCJF/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":"2026-05-19T00:51:59Z","links":{"resolver":"https://pith.science/pith/WWHMD34A77RX5TKPCXCPH5HCJF","bundle":"https://pith.science/pith/WWHMD34A77RX5TKPCXCPH5HCJF/bundle.json","state":"https://pith.science/pith/WWHMD34A77RX5TKPCXCPH5HCJF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WWHMD34A77RX5TKPCXCPH5HCJF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:WWHMD34A77RX5TKPCXCPH5HCJF","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":"84be8c4816f0062f40a72424ab62483d85657f894c9f425e664421867b4a1621","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-09T20:13:08Z","title_canon_sha256":"6970c0133014a6c60a6b81a34f76111e198e6d43165e85cdad8cb8ba8667e822"},"schema_version":"1.0","source":{"id":"1008.1589","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1589","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1589v1","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1589","created_at":"2026-05-18T02:05:50Z"},{"alias_kind":"pith_short_12","alias_value":"WWHMD34A77RX","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"WWHMD34A77RX5TKP","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"WWHMD34A","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:91eb8c8bb6ef2fe6b63cb6f5710511b25cc3e0ce459c018158373255e6f2c13a","target":"graph","created_at":"2026-05-18T02:05:50Z","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 use archival HST observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies. In this first paper we present the observations, color-magnitude diagrams, and the SFHs of the 18 starburst galaxies, based on a homogeneous approach to the data reduction, differential extinction, and treatment of photometric completeness. We adopt a star formation rate (SFR) threshold normalized to the average SFR of the individual system as a metric for classifying starbursts in SFHs derived from resolved stellar populations. This choice facil","authors_text":"Andrew Dolphin, Benjamin Williams, Daniel Weisz, David Stark, Evan D. Skillman, John M. Cannon, Jon Holtzman, Julianne Dalcanton, Kristen B. W. McQuinn, Sebastian Hidalgo-Rodr\\'iguez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-09T20:13:08Z","title":"The Nature of Starbursts: I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1589","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":"sha256:47c4cceae10c39a26c391068b0b6cbdac2028b84c05f00a357f9f6267953e8b9","target":"record","created_at":"2026-05-18T02:05:50Z","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":"84be8c4816f0062f40a72424ab62483d85657f894c9f425e664421867b4a1621","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-09T20:13:08Z","title_canon_sha256":"6970c0133014a6c60a6b81a34f76111e198e6d43165e85cdad8cb8ba8667e822"},"schema_version":"1.0","source":{"id":"1008.1589","kind":"arxiv","version":1}},"canonical_sha256":"b58ec1ef80ffe37ecd4f15c4f3f4e249538114e649f060fc7a1eaec3bc08bd24","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b58ec1ef80ffe37ecd4f15c4f3f4e249538114e649f060fc7a1eaec3bc08bd24","first_computed_at":"2026-05-18T02:05:50.032973Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:50.032973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+xR2vnD8ffkCoEeFZgtaEtIKuMl6lZSdJh+cnU9rEn1+nx4HOLKz0AX6pNdXqDdGtdLHYRBWA660bHgaPj/ODA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:50.033625Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.1589","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47c4cceae10c39a26c391068b0b6cbdac2028b84c05f00a357f9f6267953e8b9","sha256:91eb8c8bb6ef2fe6b63cb6f5710511b25cc3e0ce459c018158373255e6f2c13a"],"state_sha256":"4897fc6b467915dbc3e267f5fb7c50ce2fe6a71960f988a86360ebf22a7c263e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vvpS12nCd2Wzzy213BaubXzrmGGO+S7YJdckozHtQCc7zoGe6rywXmtCrpHGhVRYqvwQYWnIq+bnOJz7fH0KBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T00:51:59.196130Z","bundle_sha256":"9d7b26d65112474ccc13388a2d02d8c01c21630ef66d5150cf940871e231ed24"}}