{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:RBDRDDKAY7TAICJOHCBLPR2IX2","short_pith_number":"pith:RBDRDDKA","canonical_record":{"source":{"id":"0909.1256","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-07T14:31:56Z","cross_cats_sorted":[],"title_canon_sha256":"b8b8bfe9ffddd7e55d5c890724353b7694bff8441b4dca92e4c654387b8343c5","abstract_canon_sha256":"b01b78b2e80a9eccd6c7ae84a14c03be104b21a33cd8affda269ec1642c014a6"},"schema_version":"1.0"},"canonical_sha256":"8847118d40c7e604092e3882b7c748be8cb747a7211ed88c2d3a926ce9b33023","source":{"kind":"arxiv","id":"0909.1256","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.1256","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.1256v1","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.1256","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"RBDRDDKAY7TA","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"RBDRDDKAY7TAICJO","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"RBDRDDKA","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:RBDRDDKAY7TAICJOHCBLPR2IX2","target":"record","payload":{"canonical_record":{"source":{"id":"0909.1256","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-07T14:31:56Z","cross_cats_sorted":[],"title_canon_sha256":"b8b8bfe9ffddd7e55d5c890724353b7694bff8441b4dca92e4c654387b8343c5","abstract_canon_sha256":"b01b78b2e80a9eccd6c7ae84a14c03be104b21a33cd8affda269ec1642c014a6"},"schema_version":"1.0"},"canonical_sha256":"8847118d40c7e604092e3882b7c748be8cb747a7211ed88c2d3a926ce9b33023","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:30.874654Z","signature_b64":"HvqekV48d9uvlMpj5v+BiOOdqjuHeSLayO8ds5qSfgWM5YpuVac1YDoQUwjGpChUwKvwhqd4qCvsg1XHQVmzBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8847118d40c7e604092e3882b7c748be8cb747a7211ed88c2d3a926ce9b33023","last_reissued_at":"2026-05-18T02:34:30.874213Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:30.874213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.1256","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":"2026-05-18T02:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o8mU4DflV/xrd+vDx5CPVT14ThvxRHhF27cRC6G2Kc4kMWfkgiX3HFbSy5pltl+YJc0h1WswOjhDpINgs2I7Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:30:39.664236Z"},"content_sha256":"d3dde82dacb1886e00eae6c0a275bbe6dff62ba7c99c304ee37ded46cf98f3f2","schema_version":"1.0","event_id":"sha256:d3dde82dacb1886e00eae6c0a275bbe6dff62ba7c99c304ee37ded46cf98f3f2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:RBDRDDKAY7TAICJOHCBLPR2IX2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the extended structure of the Phoenix dwarf galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"2, 2), 2) ((1) Instituto de Astrof\\'isica de Canarias, (2) Departamento de Astrof\\'isica de la Universidad de La Laguna, 3), (3) University of Minnesota), A. Aparicio (1, C. Gallart (1, D. Mart\\'inez-Delgado (1, S. L. Hidalgo (1","submitted_at":"2009-09-07T14:31:56Z","abstract_excerpt":"We present the star formation history (SFH) and its variations with galactocentric distance for the Local Group dwarf galaxy of Phoenix. Color-magnitude diagram was obtained from WFPC2@HST reaching the oldest main sequence turnoffs. The IAC-star and IAC-pop codes and the MinnIAC suite have been used to obtain the star formation rate as a function of time, metallicity, and radius. We find that Phoenix has had ongoing but gradually decreasing star formation over nearly a Hubble time. The highest level of star formation occurred from the formation of the galaxy till 10.5 Gyr ago, when 50% of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.1256","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":"2026-05-18T02:34:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lxFFLB8M02733LzaNk+yon863Rb9QvGzOCO9K2k7MYIAmo871QZsKBCFhBxDfRKZwoyPiT8rJSOHLCH6N0wwAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:30:39.664691Z"},"content_sha256":"9f7c39dde0df680de23f9fb6afcd220bf883861871a65cb1bfb9cd4b8e0dfe3a","schema_version":"1.0","event_id":"sha256:9f7c39dde0df680de23f9fb6afcd220bf883861871a65cb1bfb9cd4b8e0dfe3a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/bundle.json","state_url":"https://pith.science/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/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":"2026-05-26T22:30:39Z","links":{"resolver":"https://pith.science/pith/RBDRDDKAY7TAICJOHCBLPR2IX2","bundle":"https://pith.science/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/bundle.json","state":"https://pith.science/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RBDRDDKAY7TAICJOHCBLPR2IX2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:RBDRDDKAY7TAICJOHCBLPR2IX2","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":"b01b78b2e80a9eccd6c7ae84a14c03be104b21a33cd8affda269ec1642c014a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-07T14:31:56Z","title_canon_sha256":"b8b8bfe9ffddd7e55d5c890724353b7694bff8441b4dca92e4c654387b8343c5"},"schema_version":"1.0","source":{"id":"0909.1256","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.1256","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"arxiv_version","alias_value":"0909.1256v1","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.1256","created_at":"2026-05-18T02:34:30Z"},{"alias_kind":"pith_short_12","alias_value":"RBDRDDKAY7TA","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"RBDRDDKAY7TAICJO","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"RBDRDDKA","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:9f7c39dde0df680de23f9fb6afcd220bf883861871a65cb1bfb9cd4b8e0dfe3a","target":"graph","created_at":"2026-05-18T02:34:30Z","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 present the star formation history (SFH) and its variations with galactocentric distance for the Local Group dwarf galaxy of Phoenix. Color-magnitude diagram was obtained from WFPC2@HST reaching the oldest main sequence turnoffs. The IAC-star and IAC-pop codes and the MinnIAC suite have been used to obtain the star formation rate as a function of time, metallicity, and radius. We find that Phoenix has had ongoing but gradually decreasing star formation over nearly a Hubble time. The highest level of star formation occurred from the formation of the galaxy till 10.5 Gyr ago, when 50% of the ","authors_text":"2, 2), 2) ((1) Instituto de Astrof\\'isica de Canarias, (2) Departamento de Astrof\\'isica de la Universidad de La Laguna, 3), (3) University of Minnesota), A. Aparicio (1, C. Gallart (1, D. Mart\\'inez-Delgado (1, S. L. Hidalgo (1","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-07T14:31:56Z","title":"On the extended structure of the Phoenix dwarf galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.1256","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:d3dde82dacb1886e00eae6c0a275bbe6dff62ba7c99c304ee37ded46cf98f3f2","target":"record","created_at":"2026-05-18T02:34:30Z","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":"b01b78b2e80a9eccd6c7ae84a14c03be104b21a33cd8affda269ec1642c014a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-07T14:31:56Z","title_canon_sha256":"b8b8bfe9ffddd7e55d5c890724353b7694bff8441b4dca92e4c654387b8343c5"},"schema_version":"1.0","source":{"id":"0909.1256","kind":"arxiv","version":1}},"canonical_sha256":"8847118d40c7e604092e3882b7c748be8cb747a7211ed88c2d3a926ce9b33023","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8847118d40c7e604092e3882b7c748be8cb747a7211ed88c2d3a926ce9b33023","first_computed_at":"2026-05-18T02:34:30.874213Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:30.874213Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HvqekV48d9uvlMpj5v+BiOOdqjuHeSLayO8ds5qSfgWM5YpuVac1YDoQUwjGpChUwKvwhqd4qCvsg1XHQVmzBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:30.874654Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.1256","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d3dde82dacb1886e00eae6c0a275bbe6dff62ba7c99c304ee37ded46cf98f3f2","sha256:9f7c39dde0df680de23f9fb6afcd220bf883861871a65cb1bfb9cd4b8e0dfe3a"],"state_sha256":"afc29ee6c7fb780836aea6cec231c9a1b764691bcaa6066433c038ac4fa0e1b8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9OQYJmjGGGJdKNOjd/x2quvm+69AsEYS4J1Nn8jp87iYUYYrvaufeuBUOdsC+vKOaVoWdLQNle9HJllE/Y/SDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:30:39.668304Z","bundle_sha256":"20a128846d3fd7d2504175badc72f1d91c7f25584d09f7e194a9f067b2441093"}}