{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:RH4ZPXJNUZMVVEM3PRRJDHFB24","short_pith_number":"pith:RH4ZPXJN","canonical_record":{"source":{"id":"1710.09947","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-26T23:42:08Z","cross_cats_sorted":[],"title_canon_sha256":"58aebda92d71d4a2ef690b4f3c866492f7036a434c271a6eecbd536bee27149b","abstract_canon_sha256":"5aae5756891016d03b62e945fff6759d6e07644796ad449ff60fc5a3b8fc60ea"},"schema_version":"1.0"},"canonical_sha256":"89f997dd2da6595a919b7c62919ca1d71d686e5d54f9e544b0ed5f61e46eefac","source":{"kind":"arxiv","id":"1710.09947","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.09947","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"arxiv_version","alias_value":"1710.09947v1","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.09947","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"pith_short_12","alias_value":"RH4ZPXJNUZMV","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"RH4ZPXJNUZMVVEM3","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"RH4ZPXJN","created_at":"2026-05-18T12:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:RH4ZPXJNUZMVVEM3PRRJDHFB24","target":"record","payload":{"canonical_record":{"source":{"id":"1710.09947","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-26T23:42:08Z","cross_cats_sorted":[],"title_canon_sha256":"58aebda92d71d4a2ef690b4f3c866492f7036a434c271a6eecbd536bee27149b","abstract_canon_sha256":"5aae5756891016d03b62e945fff6759d6e07644796ad449ff60fc5a3b8fc60ea"},"schema_version":"1.0"},"canonical_sha256":"89f997dd2da6595a919b7c62919ca1d71d686e5d54f9e544b0ed5f61e46eefac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:31:11.186376Z","signature_b64":"MjZdQexg7EPaPRKmE1tzpw2IdCn1msU1+0SacdNDAmUWa9E84RUWCK5g8qwE7YbJ4x2uhZoM2B0vSRr02eY4Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"89f997dd2da6595a919b7c62919ca1d71d686e5d54f9e544b0ed5f61e46eefac","last_reissued_at":"2026-05-18T00:31:11.185668Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:31:11.185668Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.09947","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":"2026-05-18T00:31:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fuCLQ31jOFBBDNrHmfyKs78poFOcvUqaqhv9IBG6ViYHqy5i6iqU//84Gp0LHfD371UVyWVNNOPJCClRYBykCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:09:39.945552Z"},"content_sha256":"d068fb55ba4e6db0b65abc9a4e1d4e42d4ce5121bbd61c3e5a2bdd0d71043660","schema_version":"1.0","event_id":"sha256:d068fb55ba4e6db0b65abc9a4e1d4e42d4ce5121bbd61c3e5a2bdd0d71043660"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:RH4ZPXJNUZMVVEM3PRRJDHFB24","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tidal origin of NGC 1427A in the Fornax cluster","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Popping, A. Venhola, B. Catinella, B. Koribalski, E. Iodice, K. Lee-Waddell, L. Cortese, M. Capaccioli, O. Keenan, P. Serra, R. Peletier","submitted_at":"2017-10-26T23:42:08Z","abstract_excerpt":"We present new HI observations from the Australia Telescope Compact Array and deep optical imaging from OmegaCam on the VLT Survey Telescope of NGC 1427A, an arrow-shaped dwarf irregular galaxy located in the Fornax cluster. The data reveal a star-less HI tail that contains ~10% of the atomic gas of NGC 1427A as well as extended stellar emission that shed new light on the recent history of this galaxy. Rather than being the result of ram pressure induced star-formation, as previously suggested in the literature, the disturbed optical appearance of NGC 1427A has tidal origins. The galaxy itself"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.09947","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":"2026-05-18T00:31:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HbElt/NODrR3SnBpqgvbDenezfDpCbgewvcrXz/t8A3HlmMlGXQneoTU7JHcHrQQxcYrcL8DycuAW+tPDHnFDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:09:39.946190Z"},"content_sha256":"2c0f5b32a3b0a995c3745ca3885304f7a1284622d658dfd05f907f91ae3bdbf5","schema_version":"1.0","event_id":"sha256:2c0f5b32a3b0a995c3745ca3885304f7a1284622d658dfd05f907f91ae3bdbf5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/bundle.json","state_url":"https://pith.science/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/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":"2026-05-28T08:09:39Z","links":{"resolver":"https://pith.science/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24","bundle":"https://pith.science/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/bundle.json","state":"https://pith.science/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RH4ZPXJNUZMVVEM3PRRJDHFB24/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:RH4ZPXJNUZMVVEM3PRRJDHFB24","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":"5aae5756891016d03b62e945fff6759d6e07644796ad449ff60fc5a3b8fc60ea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-26T23:42:08Z","title_canon_sha256":"58aebda92d71d4a2ef690b4f3c866492f7036a434c271a6eecbd536bee27149b"},"schema_version":"1.0","source":{"id":"1710.09947","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.09947","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"arxiv_version","alias_value":"1710.09947v1","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.09947","created_at":"2026-05-18T00:31:11Z"},{"alias_kind":"pith_short_12","alias_value":"RH4ZPXJNUZMV","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"RH4ZPXJNUZMVVEM3","created_at":"2026-05-18T12:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"RH4ZPXJN","created_at":"2026-05-18T12:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:2c0f5b32a3b0a995c3745ca3885304f7a1284622d658dfd05f907f91ae3bdbf5","target":"graph","created_at":"2026-05-18T00:31:11Z","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 new HI observations from the Australia Telescope Compact Array and deep optical imaging from OmegaCam on the VLT Survey Telescope of NGC 1427A, an arrow-shaped dwarf irregular galaxy located in the Fornax cluster. The data reveal a star-less HI tail that contains ~10% of the atomic gas of NGC 1427A as well as extended stellar emission that shed new light on the recent history of this galaxy. Rather than being the result of ram pressure induced star-formation, as previously suggested in the literature, the disturbed optical appearance of NGC 1427A has tidal origins. The galaxy itself","authors_text":"A. Popping, A. Venhola, B. Catinella, B. Koribalski, E. Iodice, K. Lee-Waddell, L. Cortese, M. Capaccioli, O. Keenan, P. Serra, R. Peletier","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-26T23:42:08Z","title":"Tidal origin of NGC 1427A in the Fornax cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.09947","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:d068fb55ba4e6db0b65abc9a4e1d4e42d4ce5121bbd61c3e5a2bdd0d71043660","target":"record","created_at":"2026-05-18T00:31:11Z","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":"5aae5756891016d03b62e945fff6759d6e07644796ad449ff60fc5a3b8fc60ea","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-10-26T23:42:08Z","title_canon_sha256":"58aebda92d71d4a2ef690b4f3c866492f7036a434c271a6eecbd536bee27149b"},"schema_version":"1.0","source":{"id":"1710.09947","kind":"arxiv","version":1}},"canonical_sha256":"89f997dd2da6595a919b7c62919ca1d71d686e5d54f9e544b0ed5f61e46eefac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"89f997dd2da6595a919b7c62919ca1d71d686e5d54f9e544b0ed5f61e46eefac","first_computed_at":"2026-05-18T00:31:11.185668Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:31:11.185668Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MjZdQexg7EPaPRKmE1tzpw2IdCn1msU1+0SacdNDAmUWa9E84RUWCK5g8qwE7YbJ4x2uhZoM2B0vSRr02eY4Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:31:11.186376Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.09947","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d068fb55ba4e6db0b65abc9a4e1d4e42d4ce5121bbd61c3e5a2bdd0d71043660","sha256:2c0f5b32a3b0a995c3745ca3885304f7a1284622d658dfd05f907f91ae3bdbf5"],"state_sha256":"1e0a0e7ae8ae2dada25397a49b5dd94fe52a2dbe47f66cf401f4d07f36bc75d1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+5SahvYh2JjQEzimfs+E2Ueci4or22h7ET6yb03HinDnaJ8QBGbcgxqkPZW/cyuMh1WLmOeMbBwvz7a8QVy9DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T08:09:39.949054Z","bundle_sha256":"81bb8c05b3b7bc56db3f92ac0aabee09f1480d5933e19bebc47a35bfd548edd9"}}