{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:VDZFTCTE7W7LCGHB33FRQT7IQQ","short_pith_number":"pith:VDZFTCTE","canonical_record":{"source":{"id":"1307.5711","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-22T13:52:13Z","cross_cats_sorted":[],"title_canon_sha256":"4b44e650db0000dd7c59c2197f04e3570a26f6f78479ea2cbc4ea1073f23bbdc","abstract_canon_sha256":"3739f761f930a0eef71d8c586264b2ec3bbdbd87bc9574cacbaa91d7808b92a6"},"schema_version":"1.0"},"canonical_sha256":"a8f2598a64fdbeb118e1decb184fe8842866b9b7733623b81789f2ca862d52ce","source":{"kind":"arxiv","id":"1307.5711","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.5711","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"arxiv_version","alias_value":"1307.5711v1","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.5711","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"pith_short_12","alias_value":"VDZFTCTE7W7L","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"VDZFTCTE7W7LCGHB","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"VDZFTCTE","created_at":"2026-05-18T12:28:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:VDZFTCTE7W7LCGHB33FRQT7IQQ","target":"record","payload":{"canonical_record":{"source":{"id":"1307.5711","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-22T13:52:13Z","cross_cats_sorted":[],"title_canon_sha256":"4b44e650db0000dd7c59c2197f04e3570a26f6f78479ea2cbc4ea1073f23bbdc","abstract_canon_sha256":"3739f761f930a0eef71d8c586264b2ec3bbdbd87bc9574cacbaa91d7808b92a6"},"schema_version":"1.0"},"canonical_sha256":"a8f2598a64fdbeb118e1decb184fe8842866b9b7733623b81789f2ca862d52ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:41.799046Z","signature_b64":"GPB37iTcm06kuMq64aTe5Lrw8T/PytCYHo7f7W7D/Ad4hTUnksfo7yc49WAYQWf6WFtQHb889hR8w96XR2jFBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a8f2598a64fdbeb118e1decb184fe8842866b9b7733623b81789f2ca862d52ce","last_reissued_at":"2026-05-18T01:48:41.798423Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:41.798423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.5711","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":"2026-05-18T01:48:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RYRRsMbRH51hzx98hBjS5Bl74t33Ml0hF2rFtLOJyflVVcBo+1lMKpmLwxAKR4yeFanGYwLNOTTE+36FSflHAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:20:33.994859Z"},"content_sha256":"0f865af85ed0737f6bb465660a2947e65d926abc9aa0cc880d8d5ace2b02f463","schema_version":"1.0","event_id":"sha256:0f865af85ed0737f6bb465660a2947e65d926abc9aa0cc880d8d5ace2b02f463"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:VDZFTCTE7W7LCGHB33FRQT7IQQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Alignment of the Angular Momentum Vectors of Planetary Nebulae in the Galactic Bulge","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. A. Zijlstra, B. Rees","submitted_at":"2013-07-22T13:52:13Z","abstract_excerpt":"We use high-resolution H {\\alpha} images of 130 planetary nebulae (PNe) to investigate whether there is a preferred orientation for PNe within the Galactic Bulge. The orientations of the full sample have an uniform distribution. However, at a significance level of 0.01, there is evidence for a non-uniform distribution for those planetary nebulae with evident bipolar morphology. If we assume that the bipolar PNe have an unimodal distribution of the polar axis in Galactic coordinates, the mean Galactic position angle is consistent with 90{\\deg}, i.e. along the Galactic plane, and the significanc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5711","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":"2026-05-18T01:48:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLNcZs2RcfxKNmq4sRnbipPsUlf4q35YVnoWjW04DNau5h/tv7jgz7zYdD96GeWtk3z04s5p8MYQnyiNtq9oAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:20:33.995569Z"},"content_sha256":"378d15a46c4029bc1c9c29aa3a7449e1b65510f5111b6262a94cdc133d4f5df6","schema_version":"1.0","event_id":"sha256:378d15a46c4029bc1c9c29aa3a7449e1b65510f5111b6262a94cdc133d4f5df6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/bundle.json","state_url":"https://pith.science/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/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":"2026-05-29T15:20:33Z","links":{"resolver":"https://pith.science/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ","bundle":"https://pith.science/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/bundle.json","state":"https://pith.science/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VDZFTCTE7W7LCGHB33FRQT7IQQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:VDZFTCTE7W7LCGHB33FRQT7IQQ","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":"3739f761f930a0eef71d8c586264b2ec3bbdbd87bc9574cacbaa91d7808b92a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-22T13:52:13Z","title_canon_sha256":"4b44e650db0000dd7c59c2197f04e3570a26f6f78479ea2cbc4ea1073f23bbdc"},"schema_version":"1.0","source":{"id":"1307.5711","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.5711","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"arxiv_version","alias_value":"1307.5711v1","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.5711","created_at":"2026-05-18T01:48:41Z"},{"alias_kind":"pith_short_12","alias_value":"VDZFTCTE7W7L","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"VDZFTCTE7W7LCGHB","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"VDZFTCTE","created_at":"2026-05-18T12:28:04Z"}],"graph_snapshots":[{"event_id":"sha256:378d15a46c4029bc1c9c29aa3a7449e1b65510f5111b6262a94cdc133d4f5df6","target":"graph","created_at":"2026-05-18T01:48:41Z","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 high-resolution H {\\alpha} images of 130 planetary nebulae (PNe) to investigate whether there is a preferred orientation for PNe within the Galactic Bulge. The orientations of the full sample have an uniform distribution. However, at a significance level of 0.01, there is evidence for a non-uniform distribution for those planetary nebulae with evident bipolar morphology. If we assume that the bipolar PNe have an unimodal distribution of the polar axis in Galactic coordinates, the mean Galactic position angle is consistent with 90{\\deg}, i.e. along the Galactic plane, and the significanc","authors_text":"A. A. Zijlstra, B. Rees","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-22T13:52:13Z","title":"Alignment of the Angular Momentum Vectors of Planetary Nebulae in the Galactic Bulge"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.5711","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":"sha256:0f865af85ed0737f6bb465660a2947e65d926abc9aa0cc880d8d5ace2b02f463","target":"record","created_at":"2026-05-18T01:48:41Z","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":"3739f761f930a0eef71d8c586264b2ec3bbdbd87bc9574cacbaa91d7808b92a6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-07-22T13:52:13Z","title_canon_sha256":"4b44e650db0000dd7c59c2197f04e3570a26f6f78479ea2cbc4ea1073f23bbdc"},"schema_version":"1.0","source":{"id":"1307.5711","kind":"arxiv","version":1}},"canonical_sha256":"a8f2598a64fdbeb118e1decb184fe8842866b9b7733623b81789f2ca862d52ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8f2598a64fdbeb118e1decb184fe8842866b9b7733623b81789f2ca862d52ce","first_computed_at":"2026-05-18T01:48:41.798423Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:41.798423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GPB37iTcm06kuMq64aTe5Lrw8T/PytCYHo7f7W7D/Ad4hTUnksfo7yc49WAYQWf6WFtQHb889hR8w96XR2jFBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:41.799046Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.5711","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f865af85ed0737f6bb465660a2947e65d926abc9aa0cc880d8d5ace2b02f463","sha256:378d15a46c4029bc1c9c29aa3a7449e1b65510f5111b6262a94cdc133d4f5df6"],"state_sha256":"68c5eb2109abb0f23c7a35efa275fc47d4f8170825e41654f8b9e83d84a26689"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XmLWfXncaa371XGpiShEcyjO0SBNjo8iNjeBkT0pZBri0ZvvWMY6wKY8ZWCDQEZzpRPEw9ORoW8BZlw79ysaBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T15:20:33.999185Z","bundle_sha256":"2e544be73a69cbd5ac8610030e2b6c924edddbc7a6b308e902ef070f4eebc8c9"}}