{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:WYRQMNJT4CLJOXLLKRGZUCZTI2","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":"83bb6b61984f1b4bb327d2a1a31920b9ad5ef175a7ebc5e6b6bef2bc18e7caf9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-03-25T12:21:22Z","title_canon_sha256":"6d818514a04a57b6f52a9875064b6780780655b367525d862a7c52934481e0ce"},"schema_version":"1.0","source":{"id":"1003.4872","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.4872","created_at":"2026-05-18T02:08:23Z"},{"alias_kind":"arxiv_version","alias_value":"1003.4872v1","created_at":"2026-05-18T02:08:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.4872","created_at":"2026-05-18T02:08:23Z"},{"alias_kind":"pith_short_12","alias_value":"WYRQMNJT4CLJ","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"WYRQMNJT4CLJOXLL","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"WYRQMNJT","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:36051626ed88a10121b2e58b4d3eaa639806db19265526e1a5edbe48e6816988","target":"graph","created_at":"2026-05-18T02:08:23Z","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":"The surface brightness profile of H-alpha emission in galaxies is generally thought to be confined by a sharp truncation, sometimes speculated to coincide with a star formation threshold. Over the past years, observational evidence for both old and young stellar populations, as well as individual H II regions, has demonstrated that the outer disk is an actively evolving part of a galaxy. To provide constraints on the origin of the aforementioned H-alpha truncation and the relation of H-alpha emission in the outer disk to the underlying stellar population, we measure the shape of the outer H-al","authors_text":"Daniel Christlein, Dennis Zaritsky, Joss Bland-Hawthorn","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-03-25T12:21:22Z","title":"A Spectroscopic Study of the H-alpha Surface Brightness Profiles in the Outer Disks of Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.4872","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":"sha256:69bff4a5a4bab44cc2c43dd54763ad3661e7af34fc8130199e66e62f8f3874b6","target":"record","created_at":"2026-05-18T02:08:23Z","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":"83bb6b61984f1b4bb327d2a1a31920b9ad5ef175a7ebc5e6b6bef2bc18e7caf9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-03-25T12:21:22Z","title_canon_sha256":"6d818514a04a57b6f52a9875064b6780780655b367525d862a7c52934481e0ce"},"schema_version":"1.0","source":{"id":"1003.4872","kind":"arxiv","version":1}},"canonical_sha256":"b623063533e096975d6b544d9a0b3346ad2d4e921b2b78b12f8fd6c829663565","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b623063533e096975d6b544d9a0b3346ad2d4e921b2b78b12f8fd6c829663565","first_computed_at":"2026-05-18T02:08:23.114354Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:23.114354Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rR838+LrpQzvWpHGlK1n8Tdvh0U+S9KL+8YBso/4KV47RFSacI74o1gIO9K+X0olzb9yYsegmqUEAf7eMM/PDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:23.115471Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.4872","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:69bff4a5a4bab44cc2c43dd54763ad3661e7af34fc8130199e66e62f8f3874b6","sha256:36051626ed88a10121b2e58b4d3eaa639806db19265526e1a5edbe48e6816988"],"state_sha256":"a2930202d4ae61f6687da4d77f8391eeeebc213928619166dd9f5f8c897a4409"}