{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:OUPFIW6DXHUKCBKELRE6EQHGC6","short_pith_number":"pith:OUPFIW6D","canonical_record":{"source":{"id":"1004.1549","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-09T13:08:55Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"0c2f7b6e177622326df824f2886f4b07bbb9aea9f63378a728b422fd783966d2","abstract_canon_sha256":"28d613e048f00e4be50dfc245285b8e7a20480261420d9409749b17c3d43799e"},"schema_version":"1.0"},"canonical_sha256":"751e545bc3b9e8a105445c49e240e617a9e741e3907f2ce96a20b9f089d59be3","source":{"kind":"arxiv","id":"1004.1549","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.1549","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"arxiv_version","alias_value":"1004.1549v1","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.1549","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"pith_short_12","alias_value":"OUPFIW6DXHUK","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OUPFIW6DXHUKCBKE","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OUPFIW6D","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:OUPFIW6DXHUKCBKELRE6EQHGC6","target":"record","payload":{"canonical_record":{"source":{"id":"1004.1549","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-09T13:08:55Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"0c2f7b6e177622326df824f2886f4b07bbb9aea9f63378a728b422fd783966d2","abstract_canon_sha256":"28d613e048f00e4be50dfc245285b8e7a20480261420d9409749b17c3d43799e"},"schema_version":"1.0"},"canonical_sha256":"751e545bc3b9e8a105445c49e240e617a9e741e3907f2ce96a20b9f089d59be3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:08:07.439431Z","signature_b64":"p2DcOlGy5+dPEMXvK2NYdHxmzckNNgpHIpwVFFS1j9za8Ge4sQrdzxMb5Mpm4tuFi0Az0tQEwBWvyGuw7G4YBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"751e545bc3b9e8a105445c49e240e617a9e741e3907f2ce96a20b9f089d59be3","last_reissued_at":"2026-05-18T02:08:07.438663Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:08:07.438663Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1004.1549","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":"2026-05-18T02:08:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ne4G9lsximnu96L2ZbIaeyXCZRrE3zW5bpiRpVTFNCuDvC28BOklRDCv7y2gpHOSsjPIm6416vzrPDOzyxbPBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:23:30.193818Z"},"content_sha256":"8e76004aeca5faf43e53bc49243fe445e62fca7f3db1cd93e0030ab2d70d0971","schema_version":"1.0","event_id":"sha256:8e76004aeca5faf43e53bc49243fe445e62fca7f3db1cd93e0030ab2d70d0971"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:OUPFIW6DXHUKCBKELRE6EQHGC6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Very Large Telescope imaging and spectroscopic survey of the Wolf-Rayet population in NGC 7793","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"J. L. Bibby, P. A. Crowther (Sheffield)","submitted_at":"2010-04-09T13:08:55Z","abstract_excerpt":"We present a VLT/FORS1 imaging and spectroscopic survey of the Wolf-Rayet (WR) population in the Sculptor group spiral galaxy NGC 7793. We identify 74 emission line candidates from archival narrow-band imaging, from which 39 were observed with the Multi Object Spectroscopy (MOS) mode of FORS1. 85% of these sources displayed WR features. Additional slits were used to observe HII regions, enabling an estimate of the metallicity gradient of NGC 7793 using strong line calibrations, from which a central oxygen content of log (O/H) + 12 = 8.6 was obtained, falling to 8.25 at R_25. We have estimated "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.1549","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":"2026-05-18T02:08:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x4BPISabsPtb6qpvpMmulv+BvIhHq9axKiwYHD0ZghziTrPWCTAxhIyYc/+I+4S1hTQNXXpCbs3kCynTEZFTAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T16:23:30.194182Z"},"content_sha256":"c714835dcb52bab011500ba5ca3303efedac02e9dd9902b4328865f98de38129","schema_version":"1.0","event_id":"sha256:c714835dcb52bab011500ba5ca3303efedac02e9dd9902b4328865f98de38129"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/bundle.json","state_url":"https://pith.science/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/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":"2026-06-09T16:23:30Z","links":{"resolver":"https://pith.science/pith/OUPFIW6DXHUKCBKELRE6EQHGC6","bundle":"https://pith.science/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/bundle.json","state":"https://pith.science/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OUPFIW6DXHUKCBKELRE6EQHGC6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:OUPFIW6DXHUKCBKELRE6EQHGC6","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":"28d613e048f00e4be50dfc245285b8e7a20480261420d9409749b17c3d43799e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-09T13:08:55Z","title_canon_sha256":"0c2f7b6e177622326df824f2886f4b07bbb9aea9f63378a728b422fd783966d2"},"schema_version":"1.0","source":{"id":"1004.1549","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.1549","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"arxiv_version","alias_value":"1004.1549v1","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.1549","created_at":"2026-05-18T02:08:07Z"},{"alias_kind":"pith_short_12","alias_value":"OUPFIW6DXHUK","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OUPFIW6DXHUKCBKE","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OUPFIW6D","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:c714835dcb52bab011500ba5ca3303efedac02e9dd9902b4328865f98de38129","target":"graph","created_at":"2026-05-18T02:08:07Z","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 VLT/FORS1 imaging and spectroscopic survey of the Wolf-Rayet (WR) population in the Sculptor group spiral galaxy NGC 7793. We identify 74 emission line candidates from archival narrow-band imaging, from which 39 were observed with the Multi Object Spectroscopy (MOS) mode of FORS1. 85% of these sources displayed WR features. Additional slits were used to observe HII regions, enabling an estimate of the metallicity gradient of NGC 7793 using strong line calibrations, from which a central oxygen content of log (O/H) + 12 = 8.6 was obtained, falling to 8.25 at R_25. We have estimated ","authors_text":"J. L. Bibby, P. A. Crowther (Sheffield)","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-09T13:08:55Z","title":"A Very Large Telescope imaging and spectroscopic survey of the Wolf-Rayet population in NGC 7793"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.1549","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":"sha256:8e76004aeca5faf43e53bc49243fe445e62fca7f3db1cd93e0030ab2d70d0971","target":"record","created_at":"2026-05-18T02:08:07Z","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":"28d613e048f00e4be50dfc245285b8e7a20480261420d9409749b17c3d43799e","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-04-09T13:08:55Z","title_canon_sha256":"0c2f7b6e177622326df824f2886f4b07bbb9aea9f63378a728b422fd783966d2"},"schema_version":"1.0","source":{"id":"1004.1549","kind":"arxiv","version":1}},"canonical_sha256":"751e545bc3b9e8a105445c49e240e617a9e741e3907f2ce96a20b9f089d59be3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"751e545bc3b9e8a105445c49e240e617a9e741e3907f2ce96a20b9f089d59be3","first_computed_at":"2026-05-18T02:08:07.438663Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:07.438663Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"p2DcOlGy5+dPEMXvK2NYdHxmzckNNgpHIpwVFFS1j9za8Ge4sQrdzxMb5Mpm4tuFi0Az0tQEwBWvyGuw7G4YBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:07.439431Z","signed_message":"canonical_sha256_bytes"},"source_id":"1004.1549","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e76004aeca5faf43e53bc49243fe445e62fca7f3db1cd93e0030ab2d70d0971","sha256:c714835dcb52bab011500ba5ca3303efedac02e9dd9902b4328865f98de38129"],"state_sha256":"4d815e2e4c8469f2d8935aca94ea3c82c9107ee261f0b2b65147ceb3b3221768"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9J22PIC1QMPPCTGFhR0P7IOLw5eVhMrfBLMWqWH07i7iVgYrAWXrsEVvJka32laN8u5mvtBi7wqmcBXDs6ujBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T16:23:30.196166Z","bundle_sha256":"72f7f16b9b8249383554e5600652e6a54b7fe94805051d0fed629f66375be000"}}