{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1994:SPSAXZMHBCZQIGGQLMR6BQJP7P","short_pith_number":"pith:SPSAXZMH","canonical_record":{"source":{"id":"astro-ph/9412057","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-12-16T12:11:55Z","cross_cats_sorted":[],"title_canon_sha256":"c0a63ded9be61c6900ce9955c2e7f8c01f75dbbdf84fe3cb0eb3ba5fdebc7d68","abstract_canon_sha256":"b58933dec67ebc1c88d16737a45f7621fcb31356a8625166ee62890497f39683"},"schema_version":"1.0"},"canonical_sha256":"93e40be58708b30418d05b23e0c12ffbf6549a2c602b6c06a90c455899007660","source":{"kind":"arxiv","id":"astro-ph/9412057","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9412057","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9412057v1","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9412057","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"pith_short_12","alias_value":"SPSAXZMHBCZQ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"SPSAXZMHBCZQIGGQ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"SPSAXZMH","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1994:SPSAXZMHBCZQIGGQLMR6BQJP7P","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9412057","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-12-16T12:11:55Z","cross_cats_sorted":[],"title_canon_sha256":"c0a63ded9be61c6900ce9955c2e7f8c01f75dbbdf84fe3cb0eb3ba5fdebc7d68","abstract_canon_sha256":"b58933dec67ebc1c88d16737a45f7621fcb31356a8625166ee62890497f39683"},"schema_version":"1.0"},"canonical_sha256":"93e40be58708b30418d05b23e0c12ffbf6549a2c602b6c06a90c455899007660","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:24.007130Z","signature_b64":"TE+BiGTFvQj4SpPKIRjKbG3dImxSvtnOn7ns/1Tb4XN+FL5g33azxGpcNx0CbXH/5F/6BPRVtgQ1YM3AS/lrAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93e40be58708b30418d05b23e0c12ffbf6549a2c602b6c06a90c455899007660","last_reissued_at":"2026-05-18T01:40:24.006433Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:24.006433Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9412057","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":"2026-05-18T01:40:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jzccqZimchsh82dwrJvljBFFFRHAI7Zi79ju4M+MAg+44FNOfvugz/vXNzmGou6igpJaxi0WvUGC3biXChsSBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:50:15.014412Z"},"content_sha256":"ee3cfd6e355f740eb0a5f66dbf7e2ab5edc0b29b66cc2b08849ce05271a5d993","schema_version":"1.0","event_id":"sha256:ee3cfd6e355f740eb0a5f66dbf7e2ab5edc0b29b66cc2b08849ce05271a5d993"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1994:SPSAXZMHBCZQIGGQLMR6BQJP7P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nuclear bars and blue nuclei within barred spiral galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. Axon, I. Gatley, M. Shaw, R. Probst","submitted_at":"1994-12-16T12:11:55Z","abstract_excerpt":"Multicolour near IR photometry for a sample of 32 large barred spiral galaxies is presented. By applying ellipse fitting techniques, we identify significant isophote twists with respect to the primary bar axis in the nuclear regions of $\\sim$70 \\%\\ of the sample. These twists are identified in galaxies as late as SBbc and are clearly distinguishable from spiral arm morphology. At most seven of the galaxies with isophote twists are inferred to possess secondary (nuclear) bars, the axis ratios of which appear to correlate with morphological type. The remainder may result from triaxial bulges, or"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9412057","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":"2026-05-18T01:40:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CwYOFBbdkI7sZBi58jsPnaVbCgn+XN5LJJl9rkAZCBckvDKRA9FRcOG4J26xwqgWFBGgs5gtDthVb4dkhq7fCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:50:15.014770Z"},"content_sha256":"f4b4955b46fd42ce8549dcadbd21e15b169ebe474029d4175308abe8d71ccf87","schema_version":"1.0","event_id":"sha256:f4b4955b46fd42ce8549dcadbd21e15b169ebe474029d4175308abe8d71ccf87"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/bundle.json","state_url":"https://pith.science/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/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":"2026-06-03T16:50:15Z","links":{"resolver":"https://pith.science/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P","bundle":"https://pith.science/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/bundle.json","state":"https://pith.science/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SPSAXZMHBCZQIGGQLMR6BQJP7P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1994:SPSAXZMHBCZQIGGQLMR6BQJP7P","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":"b58933dec67ebc1c88d16737a45f7621fcb31356a8625166ee62890497f39683","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1994-12-16T12:11:55Z","title_canon_sha256":"c0a63ded9be61c6900ce9955c2e7f8c01f75dbbdf84fe3cb0eb3ba5fdebc7d68"},"schema_version":"1.0","source":{"id":"astro-ph/9412057","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9412057","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9412057v1","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9412057","created_at":"2026-05-18T01:40:24Z"},{"alias_kind":"pith_short_12","alias_value":"SPSAXZMHBCZQ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"SPSAXZMHBCZQIGGQ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"SPSAXZMH","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:f4b4955b46fd42ce8549dcadbd21e15b169ebe474029d4175308abe8d71ccf87","target":"graph","created_at":"2026-05-18T01:40:24Z","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":"Multicolour near IR photometry for a sample of 32 large barred spiral galaxies is presented. By applying ellipse fitting techniques, we identify significant isophote twists with respect to the primary bar axis in the nuclear regions of $\\sim$70 \\%\\ of the sample. These twists are identified in galaxies as late as SBbc and are clearly distinguishable from spiral arm morphology. At most seven of the galaxies with isophote twists are inferred to possess secondary (nuclear) bars, the axis ratios of which appear to correlate with morphological type. The remainder may result from triaxial bulges, or","authors_text":"D. Axon, I. Gatley, M. Shaw, R. Probst","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1994-12-16T12:11:55Z","title":"Nuclear bars and blue nuclei within barred spiral galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9412057","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:ee3cfd6e355f740eb0a5f66dbf7e2ab5edc0b29b66cc2b08849ce05271a5d993","target":"record","created_at":"2026-05-18T01:40:24Z","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":"b58933dec67ebc1c88d16737a45f7621fcb31356a8625166ee62890497f39683","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1994-12-16T12:11:55Z","title_canon_sha256":"c0a63ded9be61c6900ce9955c2e7f8c01f75dbbdf84fe3cb0eb3ba5fdebc7d68"},"schema_version":"1.0","source":{"id":"astro-ph/9412057","kind":"arxiv","version":1}},"canonical_sha256":"93e40be58708b30418d05b23e0c12ffbf6549a2c602b6c06a90c455899007660","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93e40be58708b30418d05b23e0c12ffbf6549a2c602b6c06a90c455899007660","first_computed_at":"2026-05-18T01:40:24.006433Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:24.006433Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TE+BiGTFvQj4SpPKIRjKbG3dImxSvtnOn7ns/1Tb4XN+FL5g33azxGpcNx0CbXH/5F/6BPRVtgQ1YM3AS/lrAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:24.007130Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9412057","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee3cfd6e355f740eb0a5f66dbf7e2ab5edc0b29b66cc2b08849ce05271a5d993","sha256:f4b4955b46fd42ce8549dcadbd21e15b169ebe474029d4175308abe8d71ccf87"],"state_sha256":"17995fcb7aac0d8f331d92f6c47dd00caf99080802c61450100075abf7cb80f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mml0LRlRRzuyU/KTPfBXFi4KEzVYEGogV8XfaDiGzAVBw7ktbaz2aP8tvO3i5bfYUluK0q8Ge2vgoZO/53i8Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T16:50:15.016725Z","bundle_sha256":"e81f6c9be89a2e11b7ab999bea911c8d7a0c68abf25abfccbc825590baf41ff7"}}