{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:2LYZMXJWBCVQMNXAXGA6Q7M2D5","short_pith_number":"pith:2LYZMXJW","canonical_record":{"source":{"id":"1309.4339","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-09-17T15:00:58Z","cross_cats_sorted":[],"title_canon_sha256":"0632603af7fc0c2f58ff820f58eeec170e2959cd87a51f4e370f3572e41d43cf","abstract_canon_sha256":"1f308d2ce5fa63745c2e08e22c3f98628fba873a18920d8b4c898c814235b9cb"},"schema_version":"1.0"},"canonical_sha256":"d2f1965d3608ab0636e0b981e87d9a1f72ea99b469bc93df79f943e06d23ed06","source":{"kind":"arxiv","id":"1309.4339","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.4339","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"arxiv_version","alias_value":"1309.4339v2","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.4339","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"pith_short_12","alias_value":"2LYZMXJWBCVQ","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"2LYZMXJWBCVQMNXA","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"2LYZMXJW","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:2LYZMXJWBCVQMNXAXGA6Q7M2D5","target":"record","payload":{"canonical_record":{"source":{"id":"1309.4339","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-09-17T15:00:58Z","cross_cats_sorted":[],"title_canon_sha256":"0632603af7fc0c2f58ff820f58eeec170e2959cd87a51f4e370f3572e41d43cf","abstract_canon_sha256":"1f308d2ce5fa63745c2e08e22c3f98628fba873a18920d8b4c898c814235b9cb"},"schema_version":"1.0"},"canonical_sha256":"d2f1965d3608ab0636e0b981e87d9a1f72ea99b469bc93df79f943e06d23ed06","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:36.502690Z","signature_b64":"I0W96zsdzt0yGc2Tpmlv2dpsrSjMj6qO4N1Nkk3ll+dKLuR/5ctH3smSbR2nsIT4F5h1YV718FKhctOuad/nBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2f1965d3608ab0636e0b981e87d9a1f72ea99b469bc93df79f943e06d23ed06","last_reissued_at":"2026-05-18T01:47:36.502114Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:36.502114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.4339","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:47:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jINBDAxNdDO7cf4V0bfpffjlD5fbFxIEjaCQmTR8JcgfMnn3iLkSKC4gtvZO9hoJ98B1kS9Du7ENe/l/z84CAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T00:30:27.935282Z"},"content_sha256":"247a64ff79f262b0ecef02ee71ac4f21a086e0608860601571d6aa9e6739acb2","schema_version":"1.0","event_id":"sha256:247a64ff79f262b0ecef02ee71ac4f21a086e0608860601571d6aa9e6739acb2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:2LYZMXJWBCVQMNXAXGA6Q7M2D5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Are Wolf-Rayet stars able to pollute the interstellar medium of galaxies? Results from the integral field spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Carolina Kehrig, Daniel Kunth, Enrique Perez-Montero, Florence Durret, Jarle Brinchmann, Jose M. Vilchez","submitted_at":"2013-09-17T15:00:58Z","abstract_excerpt":"We investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700-6850 AA) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis of the spatial distributions of O/H and N/O, as derived using the direct method or strong-line parameters consistent with it, indicates that metallicity is homogeneous in five out of the six analysed objects in scales of the order of several kpc. Only in the object WR404, a gradient of me"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.4339","kind":"arxiv","version":2},"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":"2026-05-18T01:47:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wDSkIunccmsevc1RfV/4jQb6qEVsIsBOveP6netYoxwb1Qr5gNcaamfsOcR6heD2KZy4zY883+xzY7q+OdorBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T00:30:27.935676Z"},"content_sha256":"7a6d2db19c878a2d965d55a1ece4a8292a36acd17ff4904de36cc47182215e6d","schema_version":"1.0","event_id":"sha256:7a6d2db19c878a2d965d55a1ece4a8292a36acd17ff4904de36cc47182215e6d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/bundle.json","state_url":"https://pith.science/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/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":"2026-05-28T00:30:27Z","links":{"resolver":"https://pith.science/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5","bundle":"https://pith.science/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/bundle.json","state":"https://pith.science/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2LYZMXJWBCVQMNXAXGA6Q7M2D5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:2LYZMXJWBCVQMNXAXGA6Q7M2D5","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":"1f308d2ce5fa63745c2e08e22c3f98628fba873a18920d8b4c898c814235b9cb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-09-17T15:00:58Z","title_canon_sha256":"0632603af7fc0c2f58ff820f58eeec170e2959cd87a51f4e370f3572e41d43cf"},"schema_version":"1.0","source":{"id":"1309.4339","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.4339","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"arxiv_version","alias_value":"1309.4339v2","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.4339","created_at":"2026-05-18T01:47:36Z"},{"alias_kind":"pith_short_12","alias_value":"2LYZMXJWBCVQ","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"2LYZMXJWBCVQMNXA","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"2LYZMXJW","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:7a6d2db19c878a2d965d55a1ece4a8292a36acd17ff4904de36cc47182215e6d","target":"graph","created_at":"2026-05-18T01:47:36Z","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 investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700-6850 AA) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis of the spatial distributions of O/H and N/O, as derived using the direct method or strong-line parameters consistent with it, indicates that metallicity is homogeneous in five out of the six analysed objects in scales of the order of several kpc. Only in the object WR404, a gradient of me","authors_text":"Carolina Kehrig, Daniel Kunth, Enrique Perez-Montero, Florence Durret, Jarle Brinchmann, Jose M. Vilchez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-09-17T15:00:58Z","title":"Are Wolf-Rayet stars able to pollute the interstellar medium of galaxies? Results from the integral field spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.4339","kind":"arxiv","version":2},"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":"sha256:247a64ff79f262b0ecef02ee71ac4f21a086e0608860601571d6aa9e6739acb2","target":"record","created_at":"2026-05-18T01:47:36Z","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":"1f308d2ce5fa63745c2e08e22c3f98628fba873a18920d8b4c898c814235b9cb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-09-17T15:00:58Z","title_canon_sha256":"0632603af7fc0c2f58ff820f58eeec170e2959cd87a51f4e370f3572e41d43cf"},"schema_version":"1.0","source":{"id":"1309.4339","kind":"arxiv","version":2}},"canonical_sha256":"d2f1965d3608ab0636e0b981e87d9a1f72ea99b469bc93df79f943e06d23ed06","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2f1965d3608ab0636e0b981e87d9a1f72ea99b469bc93df79f943e06d23ed06","first_computed_at":"2026-05-18T01:47:36.502114Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:36.502114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I0W96zsdzt0yGc2Tpmlv2dpsrSjMj6qO4N1Nkk3ll+dKLuR/5ctH3smSbR2nsIT4F5h1YV718FKhctOuad/nBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:36.502690Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.4339","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:247a64ff79f262b0ecef02ee71ac4f21a086e0608860601571d6aa9e6739acb2","sha256:7a6d2db19c878a2d965d55a1ece4a8292a36acd17ff4904de36cc47182215e6d"],"state_sha256":"75527dd0b6deee18570b0bd83b2cfcb69df0349940c339f658501844760c16ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nhz6G2Fi/sR7+vf81ysPmNh9D70xbmgfmsGuxJK+INgYe+OPJwfvDQ4eqgF8R7mPap6gFBY9H1L159xm1vJsBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T00:30:27.937650Z","bundle_sha256":"b1ef9b395e5f9c171b39e9b6602e4410d0c5b09c9442f0223196cd129a9c90ea"}}