{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:FHOD73TWT2X5VVHNIRJC7WLT6Q","short_pith_number":"pith:FHOD73TW","canonical_record":{"source":{"id":"1609.08957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-28T15:15:38Z","cross_cats_sorted":["nlin.AO","physics.class-ph"],"title_canon_sha256":"3c8be21518180f94b6d00c6fa793c35f8f0a8c3eabc3846c0cb72e275aa5e02f","abstract_canon_sha256":"c95cd419a41eccf1b5e82e9bc71c4ad8f4b7c5db03041b693fe859dab2b95baf"},"schema_version":"1.0"},"canonical_sha256":"29dc3fee769eafdad4ed44522fd973f42174e1b067952df50a4cb5bf15821044","source":{"kind":"arxiv","id":"1609.08957","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.08957","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"arxiv_version","alias_value":"1609.08957v1","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.08957","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"pith_short_12","alias_value":"FHOD73TWT2X5","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"FHOD73TWT2X5VVHN","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"FHOD73TW","created_at":"2026-05-18T12:30:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:FHOD73TWT2X5VVHNIRJC7WLT6Q","target":"record","payload":{"canonical_record":{"source":{"id":"1609.08957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-28T15:15:38Z","cross_cats_sorted":["nlin.AO","physics.class-ph"],"title_canon_sha256":"3c8be21518180f94b6d00c6fa793c35f8f0a8c3eabc3846c0cb72e275aa5e02f","abstract_canon_sha256":"c95cd419a41eccf1b5e82e9bc71c4ad8f4b7c5db03041b693fe859dab2b95baf"},"schema_version":"1.0"},"canonical_sha256":"29dc3fee769eafdad4ed44522fd973f42174e1b067952df50a4cb5bf15821044","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:59:18.869468Z","signature_b64":"TD6L6O8ganAFMIpwb1JWAdUSazgzDc9zz0MMCXwQfr7KTVGCqUqeswU/5uXsm6H1xYr+Zw5MXNqVrAg5i9MjAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"29dc3fee769eafdad4ed44522fd973f42174e1b067952df50a4cb5bf15821044","last_reissued_at":"2026-05-18T00:59:18.868747Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:59:18.868747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.08957","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":"2026-05-18T00:59:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bezwCS/+XC0aysyw9rpunEMcksUInM3to7UBskZz6OrthoG9Rl0TDs4ba71lJKQ91IdfByWXc5ALjooIy5XLCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:18:58.778075Z"},"content_sha256":"616fe3e05dbca2ce1f326153ba230078f8a002e6082e5259a37dd4bde315da20","schema_version":"1.0","event_id":"sha256:616fe3e05dbca2ce1f326153ba230078f8a002e6082e5259a37dd4bde315da20"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:FHOD73TWT2X5VVHNIRJC7WLT6Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Near-exponential surface densities as hydrostatic, nonequilibrium profiles in galaxy discs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nlin.AO","physics.class-ph"],"primary_cat":"astro-ph.GA","authors_text":"Bruce G. Elmegreen (IBM Watson Research Ctr.), Curtis Struck (Iowa State)","submitted_at":"2016-09-28T15:15:38Z","abstract_excerpt":"Apparent exponential surface density profiles are nearly universal in galaxy discs across Hubble types, over a wide mass range, and a diversity of gravitational potential forms. Several processes have been found to produce exponential profiles, including the actions of bars and spirals, and clump scattering, with star scattering a common theme in these. Based on reasonable physical constraints, such as minimal entropy gradients, we propose steady state distribution functions for disc stars, applicable over a range of gravitational potentials. The resulting surface density profiles are generall"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.08957","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":"2026-05-18T00:59:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fEHXaeMgVYaB0UzpBA5WJfI53EX0t2xYTbRLP8BViaPG/QLhPkg2aQE+ZGQqCokKQjopMsfXDJfMTyBBa+z6AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T16:18:58.778426Z"},"content_sha256":"8d331d257d833f1d4394a1bef0648a884af5f91850162656cbaa60dad3d0a639","schema_version":"1.0","event_id":"sha256:8d331d257d833f1d4394a1bef0648a884af5f91850162656cbaa60dad3d0a639"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/bundle.json","state_url":"https://pith.science/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/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":"2026-06-01T16:18:58Z","links":{"resolver":"https://pith.science/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q","bundle":"https://pith.science/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/bundle.json","state":"https://pith.science/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FHOD73TWT2X5VVHNIRJC7WLT6Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:FHOD73TWT2X5VVHNIRJC7WLT6Q","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":"c95cd419a41eccf1b5e82e9bc71c4ad8f4b7c5db03041b693fe859dab2b95baf","cross_cats_sorted":["nlin.AO","physics.class-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-28T15:15:38Z","title_canon_sha256":"3c8be21518180f94b6d00c6fa793c35f8f0a8c3eabc3846c0cb72e275aa5e02f"},"schema_version":"1.0","source":{"id":"1609.08957","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.08957","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"arxiv_version","alias_value":"1609.08957v1","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.08957","created_at":"2026-05-18T00:59:18Z"},{"alias_kind":"pith_short_12","alias_value":"FHOD73TWT2X5","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"FHOD73TWT2X5VVHN","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"FHOD73TW","created_at":"2026-05-18T12:30:15Z"}],"graph_snapshots":[{"event_id":"sha256:8d331d257d833f1d4394a1bef0648a884af5f91850162656cbaa60dad3d0a639","target":"graph","created_at":"2026-05-18T00:59:18Z","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":"Apparent exponential surface density profiles are nearly universal in galaxy discs across Hubble types, over a wide mass range, and a diversity of gravitational potential forms. Several processes have been found to produce exponential profiles, including the actions of bars and spirals, and clump scattering, with star scattering a common theme in these. Based on reasonable physical constraints, such as minimal entropy gradients, we propose steady state distribution functions for disc stars, applicable over a range of gravitational potentials. The resulting surface density profiles are generall","authors_text":"Bruce G. Elmegreen (IBM Watson Research Ctr.), Curtis Struck (Iowa State)","cross_cats":["nlin.AO","physics.class-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-28T15:15:38Z","title":"Near-exponential surface densities as hydrostatic, nonequilibrium profiles in galaxy discs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.08957","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":"sha256:616fe3e05dbca2ce1f326153ba230078f8a002e6082e5259a37dd4bde315da20","target":"record","created_at":"2026-05-18T00:59:18Z","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":"c95cd419a41eccf1b5e82e9bc71c4ad8f4b7c5db03041b693fe859dab2b95baf","cross_cats_sorted":["nlin.AO","physics.class-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-28T15:15:38Z","title_canon_sha256":"3c8be21518180f94b6d00c6fa793c35f8f0a8c3eabc3846c0cb72e275aa5e02f"},"schema_version":"1.0","source":{"id":"1609.08957","kind":"arxiv","version":1}},"canonical_sha256":"29dc3fee769eafdad4ed44522fd973f42174e1b067952df50a4cb5bf15821044","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"29dc3fee769eafdad4ed44522fd973f42174e1b067952df50a4cb5bf15821044","first_computed_at":"2026-05-18T00:59:18.868747Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:59:18.868747Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TD6L6O8ganAFMIpwb1JWAdUSazgzDc9zz0MMCXwQfr7KTVGCqUqeswU/5uXsm6H1xYr+Zw5MXNqVrAg5i9MjAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:59:18.869468Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.08957","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:616fe3e05dbca2ce1f326153ba230078f8a002e6082e5259a37dd4bde315da20","sha256:8d331d257d833f1d4394a1bef0648a884af5f91850162656cbaa60dad3d0a639"],"state_sha256":"907c76a9067605e08228b8067f520b49432d9b9da7d7804e645273e8c08c3617"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rUeIayy+1dLaA/4tipzpaMZUPysB7ZW8rW9nERTTySahLGbKqZNjDeCxqtmEgCuk6pzEv+977p9if00xxCfaCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T16:18:58.780259Z","bundle_sha256":"0e89bb5bdde02c429dbb40d7e6c8b2823ebdd253cc2fbf109a75c7efd28b8c03"}}