{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:XQWLHKQ3HSSEADI42TN5UWHDJQ","short_pith_number":"pith:XQWLHKQ3","canonical_record":{"source":{"id":"1101.0607","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-01-03T21:08:37Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"3f5f5b0e5f5dfecd54c1eaf023cdd54620f1da9738e402a87fc417e1a975d3b3","abstract_canon_sha256":"04771ebfecfb93b08553c18dd802b8b0e7e646e96ab7197749975ad2bd5023df"},"schema_version":"1.0"},"canonical_sha256":"bc2cb3aa1b3ca4400d1cd4dbda58e34c246bf3eae234f61103837e380f028b85","source":{"kind":"arxiv","id":"1101.0607","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.0607","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"arxiv_version","alias_value":"1101.0607v1","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.0607","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"pith_short_12","alias_value":"XQWLHKQ3HSSE","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"XQWLHKQ3HSSEADI4","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"XQWLHKQ3","created_at":"2026-05-18T12:26:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:XQWLHKQ3HSSEADI42TN5UWHDJQ","target":"record","payload":{"canonical_record":{"source":{"id":"1101.0607","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-01-03T21:08:37Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"3f5f5b0e5f5dfecd54c1eaf023cdd54620f1da9738e402a87fc417e1a975d3b3","abstract_canon_sha256":"04771ebfecfb93b08553c18dd802b8b0e7e646e96ab7197749975ad2bd5023df"},"schema_version":"1.0"},"canonical_sha256":"bc2cb3aa1b3ca4400d1cd4dbda58e34c246bf3eae234f61103837e380f028b85","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:13.726490Z","signature_b64":"BkzGw5DXXTsWMgBraHdm6vKVj0Jhi8JBY/S5Vl5niujPAt9buk7c3rO93zQmnKWNTzzkHMrzhPQUvjUMYIL7Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc2cb3aa1b3ca4400d1cd4dbda58e34c246bf3eae234f61103837e380f028b85","last_reissued_at":"2026-05-18T02:04:13.725864Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:13.725864Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.0607","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":"2026-05-18T02:04:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LZp++qPw+zLck7s0Y4hO3DR8zDqxptRISlXyW3bF/7mfoubkPALa2Pfq3j+6Ig7L1Nxa3Yc8SDsea8SBaYBLCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:57:12.048713Z"},"content_sha256":"564c917a776ebe73246f4cbbee146c24547442413475c3c371afa0d38308616f","schema_version":"1.0","event_id":"sha256:564c917a776ebe73246f4cbbee146c24547442413475c3c371afa0d38308616f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:XQWLHKQ3HSSEADI42TN5UWHDJQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Structure and Metallicity Gradient in the Extreme Outer Disk of NGC 7793","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Joss Bland-Hawthorn (U. Sydney), Kenneth C. Freeman (MSO/ANU), Marija Vlaji\\'c (AIP)","submitted_at":"2011-01-03T21:08:37Z","abstract_excerpt":"Studies of outer regions of spirals disks are fundamental to our understanding of both the process of galaxy assembly and the subsequent secular evolution of galaxies. In an earlier series of papers we explored the extent and abundance gradient in the outer disk of NGC 300 and found an extended purely exponential disk with a metallicity gradient which flattens off in the outermost regions. We now continue the study of outskirts of pure disk spirals with another Sculptor Group spiral, NGC 7793. Using Gemini Multi Object Spectrograph camera at Gemini South, we trace the disk of NGC 7793 with sta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.0607","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":"2026-05-18T02:04:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LKoeT48ctSMK4WaO0v9hEy46WClooQyT1IP6LQhqyXs5KLSiw254UvL0DY6pD+lcY72dNZQKHdIQZUJW9mUKBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T03:57:12.049199Z"},"content_sha256":"3a4850fb0f31003f6da3293412a0235a812a45538a6854c09a0ffa82204c660f","schema_version":"1.0","event_id":"sha256:3a4850fb0f31003f6da3293412a0235a812a45538a6854c09a0ffa82204c660f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/bundle.json","state_url":"https://pith.science/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/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":"2026-06-01T03:57:12Z","links":{"resolver":"https://pith.science/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ","bundle":"https://pith.science/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/bundle.json","state":"https://pith.science/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XQWLHKQ3HSSEADI42TN5UWHDJQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:XQWLHKQ3HSSEADI42TN5UWHDJQ","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":"04771ebfecfb93b08553c18dd802b8b0e7e646e96ab7197749975ad2bd5023df","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-01-03T21:08:37Z","title_canon_sha256":"3f5f5b0e5f5dfecd54c1eaf023cdd54620f1da9738e402a87fc417e1a975d3b3"},"schema_version":"1.0","source":{"id":"1101.0607","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.0607","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"arxiv_version","alias_value":"1101.0607v1","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.0607","created_at":"2026-05-18T02:04:13Z"},{"alias_kind":"pith_short_12","alias_value":"XQWLHKQ3HSSE","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_16","alias_value":"XQWLHKQ3HSSEADI4","created_at":"2026-05-18T12:26:47Z"},{"alias_kind":"pith_short_8","alias_value":"XQWLHKQ3","created_at":"2026-05-18T12:26:47Z"}],"graph_snapshots":[{"event_id":"sha256:3a4850fb0f31003f6da3293412a0235a812a45538a6854c09a0ffa82204c660f","target":"graph","created_at":"2026-05-18T02:04:13Z","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":"Studies of outer regions of spirals disks are fundamental to our understanding of both the process of galaxy assembly and the subsequent secular evolution of galaxies. In an earlier series of papers we explored the extent and abundance gradient in the outer disk of NGC 300 and found an extended purely exponential disk with a metallicity gradient which flattens off in the outermost regions. We now continue the study of outskirts of pure disk spirals with another Sculptor Group spiral, NGC 7793. Using Gemini Multi Object Spectrograph camera at Gemini South, we trace the disk of NGC 7793 with sta","authors_text":"Joss Bland-Hawthorn (U. Sydney), Kenneth C. Freeman (MSO/ANU), Marija Vlaji\\'c (AIP)","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-01-03T21:08:37Z","title":"The Structure and Metallicity Gradient in the Extreme Outer Disk of NGC 7793"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.0607","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":"sha256:564c917a776ebe73246f4cbbee146c24547442413475c3c371afa0d38308616f","target":"record","created_at":"2026-05-18T02:04:13Z","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":"04771ebfecfb93b08553c18dd802b8b0e7e646e96ab7197749975ad2bd5023df","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-01-03T21:08:37Z","title_canon_sha256":"3f5f5b0e5f5dfecd54c1eaf023cdd54620f1da9738e402a87fc417e1a975d3b3"},"schema_version":"1.0","source":{"id":"1101.0607","kind":"arxiv","version":1}},"canonical_sha256":"bc2cb3aa1b3ca4400d1cd4dbda58e34c246bf3eae234f61103837e380f028b85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc2cb3aa1b3ca4400d1cd4dbda58e34c246bf3eae234f61103837e380f028b85","first_computed_at":"2026-05-18T02:04:13.725864Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:13.725864Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BkzGw5DXXTsWMgBraHdm6vKVj0Jhi8JBY/S5Vl5niujPAt9buk7c3rO93zQmnKWNTzzkHMrzhPQUvjUMYIL7Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:13.726490Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.0607","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:564c917a776ebe73246f4cbbee146c24547442413475c3c371afa0d38308616f","sha256:3a4850fb0f31003f6da3293412a0235a812a45538a6854c09a0ffa82204c660f"],"state_sha256":"3b09442bd4e1ca8bd85823560b7bef7d00387366332dce1323b669eef0602977"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M4UTt9x3cBsP6yq+U/bE7jBtteQHJXf0cT5vto2vBC5CzpwSIgrEVGOOc/RWCBhflFnH7PVIFJr50WRkDdGfBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T03:57:12.052074Z","bundle_sha256":"e4e8b1ff563d66c106019662695ebf4f33c651ac1f73328d82ec0851eafdf723"}}