{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:WMESEWKYEOVYM3WWEK4H2DFTKC","short_pith_number":"pith:WMESEWKY","canonical_record":{"source":{"id":"0903.4701","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-26T21:12:56Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"b1dd93f1ff8c9f1b458cbb77b1935dfceeae58bb0f7690734ec7477259c3f3a7","abstract_canon_sha256":"a7fbf5e4128397ef8633f215feca31ef39d92fd183d90e899dac61781fd693b2"},"schema_version":"1.0"},"canonical_sha256":"b30922595823ab866ed622b87d0cb350a6d55a61bbe0ae3014a42609221faf26","source":{"kind":"arxiv","id":"0903.4701","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4701","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4701v1","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4701","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"pith_short_12","alias_value":"WMESEWKYEOVY","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WMESEWKYEOVYM3WW","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WMESEWKY","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:WMESEWKYEOVYM3WWEK4H2DFTKC","target":"record","payload":{"canonical_record":{"source":{"id":"0903.4701","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-26T21:12:56Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"b1dd93f1ff8c9f1b458cbb77b1935dfceeae58bb0f7690734ec7477259c3f3a7","abstract_canon_sha256":"a7fbf5e4128397ef8633f215feca31ef39d92fd183d90e899dac61781fd693b2"},"schema_version":"1.0"},"canonical_sha256":"b30922595823ab866ed622b87d0cb350a6d55a61bbe0ae3014a42609221faf26","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:19.237910Z","signature_b64":"xBofuX8hL/sWt2UBA3ZP+ezguGZLLm233Hh3SmAcxrSADG4vXxggbKGtqu5XunHfRPbrihXq5DaW20ig6OCeDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b30922595823ab866ed622b87d0cb350a6d55a61bbe0ae3014a42609221faf26","last_reissued_at":"2026-05-18T02:14:19.236158Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:19.236158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.4701","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":"2026-05-18T02:14:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"If7ir+XKZqAfMDRBMFjFxf3WdJ/dR2T5zOHJikIXqh9Jp0TMQL2bGEeqiv4OYQi/bIcuuk1eYVac3podRja3BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:15:26.054538Z"},"content_sha256":"d9bdca6e255fb05758b2593cee44814d1fa0a77b45b0c4eb0bb168ae5fd21fdd","schema_version":"1.0","event_id":"sha256:d9bdca6e255fb05758b2593cee44814d1fa0a77b45b0c4eb0bb168ae5fd21fdd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:WMESEWKYEOVYM3WWEK4H2DFTKC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"A. D. Mackey, A. Huxor, A. M. N. Ferguson, A. W. McConnachie, G. F. Lewis, M. Irwin, M. L. M. Collins, N. F. Martin, N. Tanvir, R. Ibata, S. C. Chapman","submitted_at":"2009-03-26T21:12:56Z","abstract_excerpt":"We present a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the tidal streams, Stream Cp and Stream Cr. These observations used the DEep Imaging Multi-Object Spectrograph (DEIMOS) mounted on the Keck II telescope to obtain spectra around the CaII triplet region with ~1.3 Angstroms resolution. Six stars lying on the red giant branch within 2 core-radii of the centre of EC4 are found to have an average vr=-287.9^{+1.9}_{-2.4}km/s and velocity dispersion of 2.7^{+4.2}_{-2.7}km/s, t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4701","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":"2026-05-18T02:14:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T1eRO7L2xiAlMOVOks0s5e1jeO3F1G7GckULFxYu48G2xCQaVPA2rB0jCBVKuoq1aEAXWfYZUb5/KvAXG7RzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:15:26.054891Z"},"content_sha256":"c3b10e83cc42938822ca583646c2ad645642c9f39f2f9a4da6649edd3d0c1ebc","schema_version":"1.0","event_id":"sha256:c3b10e83cc42938822ca583646c2ad645642c9f39f2f9a4da6649edd3d0c1ebc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/bundle.json","state_url":"https://pith.science/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/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":"2026-06-03T17:15:26Z","links":{"resolver":"https://pith.science/pith/WMESEWKYEOVYM3WWEK4H2DFTKC","bundle":"https://pith.science/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/bundle.json","state":"https://pith.science/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WMESEWKYEOVYM3WWEK4H2DFTKC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:WMESEWKYEOVYM3WWEK4H2DFTKC","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":"a7fbf5e4128397ef8633f215feca31ef39d92fd183d90e899dac61781fd693b2","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-26T21:12:56Z","title_canon_sha256":"b1dd93f1ff8c9f1b458cbb77b1935dfceeae58bb0f7690734ec7477259c3f3a7"},"schema_version":"1.0","source":{"id":"0903.4701","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4701","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4701v1","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4701","created_at":"2026-05-18T02:14:19Z"},{"alias_kind":"pith_short_12","alias_value":"WMESEWKYEOVY","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WMESEWKYEOVYM3WW","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WMESEWKY","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:c3b10e83cc42938822ca583646c2ad645642c9f39f2f9a4da6649edd3d0c1ebc","target":"graph","created_at":"2026-05-18T02:14:19Z","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 a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the tidal streams, Stream Cp and Stream Cr. These observations used the DEep Imaging Multi-Object Spectrograph (DEIMOS) mounted on the Keck II telescope to obtain spectra around the CaII triplet region with ~1.3 Angstroms resolution. Six stars lying on the red giant branch within 2 core-radii of the centre of EC4 are found to have an average vr=-287.9^{+1.9}_{-2.4}km/s and velocity dispersion of 2.7^{+4.2}_{-2.7}km/s, t","authors_text":"A. D. Mackey, A. Huxor, A. M. N. Ferguson, A. W. McConnachie, G. F. Lewis, M. Irwin, M. L. M. Collins, N. F. Martin, N. Tanvir, R. Ibata, S. C. Chapman","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-26T21:12:56Z","title":"A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4701","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:d9bdca6e255fb05758b2593cee44814d1fa0a77b45b0c4eb0bb168ae5fd21fdd","target":"record","created_at":"2026-05-18T02:14:19Z","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":"a7fbf5e4128397ef8633f215feca31ef39d92fd183d90e899dac61781fd693b2","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-26T21:12:56Z","title_canon_sha256":"b1dd93f1ff8c9f1b458cbb77b1935dfceeae58bb0f7690734ec7477259c3f3a7"},"schema_version":"1.0","source":{"id":"0903.4701","kind":"arxiv","version":1}},"canonical_sha256":"b30922595823ab866ed622b87d0cb350a6d55a61bbe0ae3014a42609221faf26","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b30922595823ab866ed622b87d0cb350a6d55a61bbe0ae3014a42609221faf26","first_computed_at":"2026-05-18T02:14:19.236158Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:19.236158Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xBofuX8hL/sWt2UBA3ZP+ezguGZLLm233Hh3SmAcxrSADG4vXxggbKGtqu5XunHfRPbrihXq5DaW20ig6OCeDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:19.237910Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.4701","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d9bdca6e255fb05758b2593cee44814d1fa0a77b45b0c4eb0bb168ae5fd21fdd","sha256:c3b10e83cc42938822ca583646c2ad645642c9f39f2f9a4da6649edd3d0c1ebc"],"state_sha256":"0dd8aea09b27582fa3fdf7c4719630c44a00377dedaf614801fd86755dd63b14"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/jRYBy9jfIDXrnwmVwN8Buon3VneIWBI9olHjCNMK8/szJHPUvkbpVnRXbNloy1aNOD4wS2FZMpkIKo6z+ciDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T17:15:26.057485Z","bundle_sha256":"20253903c75603920da3b10eb2505f6c830df52ca572e7199d3d2f01fa489c9f"}}