{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:UNKHEW5437N6BQDMBCUV4XA7SU","short_pith_number":"pith:UNKHEW54","canonical_record":{"source":{"id":"1107.5587","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-27T20:16:23Z","cross_cats_sorted":[],"title_canon_sha256":"8a23b1bc590f24974ceec05fae786ebb6c9b4481e01f83dd8909dc099fbc6e56","abstract_canon_sha256":"65f8dbae3552550cdd604d07bff0659e9b335a7b34f6af3e6aae15ed20ec1876"},"schema_version":"1.0"},"canonical_sha256":"a354725bbcdfdbe0c06c08a95e5c1f953427f67cbb6ad47eebcba5395ef9ce5e","source":{"kind":"arxiv","id":"1107.5587","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.5587","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"arxiv_version","alias_value":"1107.5587v1","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.5587","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"pith_short_12","alias_value":"UNKHEW5437N6","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"UNKHEW5437N6BQDM","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"UNKHEW54","created_at":"2026-05-18T12:26:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:UNKHEW5437N6BQDMBCUV4XA7SU","target":"record","payload":{"canonical_record":{"source":{"id":"1107.5587","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-27T20:16:23Z","cross_cats_sorted":[],"title_canon_sha256":"8a23b1bc590f24974ceec05fae786ebb6c9b4481e01f83dd8909dc099fbc6e56","abstract_canon_sha256":"65f8dbae3552550cdd604d07bff0659e9b335a7b34f6af3e6aae15ed20ec1876"},"schema_version":"1.0"},"canonical_sha256":"a354725bbcdfdbe0c06c08a95e5c1f953427f67cbb6ad47eebcba5395ef9ce5e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:08.654038Z","signature_b64":"0fUCSAAbmYvK3lqNfwFBUzNWIefM/FvLGArMUfVXC762ShaF2qa0Ar4amWSobxUAdvBOawmwAUtlZrd6Gj44DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a354725bbcdfdbe0c06c08a95e5c1f953427f67cbb6ad47eebcba5395ef9ce5e","last_reissued_at":"2026-05-18T02:01:08.653484Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:08.653484Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.5587","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":"2026-05-18T02:01:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZscEU7OaxAFItwS980VVzUfRrreTUprA54j99blaAbwRPAn+sT2gCzHSaZtUyz6qm56DFDqUUobrCzKX1iAyAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:24:33.300933Z"},"content_sha256":"8fdfac9f6c21d4d5baac314bf549ee58fdd9d1788468dd81aad7bfa81a74057e","schema_version":"1.0","event_id":"sha256:8fdfac9f6c21d4d5baac314bf549ee58fdd9d1788468dd81aad7bfa81a74057e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:UNKHEW5437N6BQDMBCUV4XA7SU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Outer Disks of Dwarf Irregular Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Bruce G. Elmegreen, Deidre A. Hunter, Ed Anderson, Malanka Riabokin, Nick Wilsey, Philip Massey, Se-Heon Oh, Tyler E. Nordgren","submitted_at":"2011-07-27T20:16:23Z","abstract_excerpt":"To explore the properties of extreme outer stellar disks, we obtained ultra-deep V and GALEX UV images of 4 dwarf irregular galaxies and one Blue Compact Dwarf galaxy and ultra-deep B images of 3 of these. Our V-band surface photometry extends to 29.5 magnitudes arcsec^-2. We convert the FUV and V-band photometry, along with Halpha photometry, into radial star formation rate profiles that are sensitive to timescales from 10 Myrs to the lifetime of the galaxy. We also compare the stellar distributions, surface brightness profiles, and star formation rate profiles to HI-line emission maps, gas s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.5587","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":"2026-05-18T02:01:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8DXbjfkaKYRC9bXZLI2mzj+VcPrQrRnQl9sKZ75KJDCzBWW6A28j8+2yav3h+76WSJRcq8TRVztPyCRl/b/8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:24:33.301558Z"},"content_sha256":"84660430dc708639bc177849d77d23d6500e4b089c5d57a771b77902e4d70b56","schema_version":"1.0","event_id":"sha256:84660430dc708639bc177849d77d23d6500e4b089c5d57a771b77902e4d70b56"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UNKHEW5437N6BQDMBCUV4XA7SU/bundle.json","state_url":"https://pith.science/pith/UNKHEW5437N6BQDMBCUV4XA7SU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UNKHEW5437N6BQDMBCUV4XA7SU/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":"2026-05-25T18:24:33Z","links":{"resolver":"https://pith.science/pith/UNKHEW5437N6BQDMBCUV4XA7SU","bundle":"https://pith.science/pith/UNKHEW5437N6BQDMBCUV4XA7SU/bundle.json","state":"https://pith.science/pith/UNKHEW5437N6BQDMBCUV4XA7SU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UNKHEW5437N6BQDMBCUV4XA7SU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:UNKHEW5437N6BQDMBCUV4XA7SU","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":"65f8dbae3552550cdd604d07bff0659e9b335a7b34f6af3e6aae15ed20ec1876","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-27T20:16:23Z","title_canon_sha256":"8a23b1bc590f24974ceec05fae786ebb6c9b4481e01f83dd8909dc099fbc6e56"},"schema_version":"1.0","source":{"id":"1107.5587","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.5587","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"arxiv_version","alias_value":"1107.5587v1","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.5587","created_at":"2026-05-18T02:01:08Z"},{"alias_kind":"pith_short_12","alias_value":"UNKHEW5437N6","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"UNKHEW5437N6BQDM","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"UNKHEW54","created_at":"2026-05-18T12:26:42Z"}],"graph_snapshots":[{"event_id":"sha256:84660430dc708639bc177849d77d23d6500e4b089c5d57a771b77902e4d70b56","target":"graph","created_at":"2026-05-18T02:01:08Z","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":"To explore the properties of extreme outer stellar disks, we obtained ultra-deep V and GALEX UV images of 4 dwarf irregular galaxies and one Blue Compact Dwarf galaxy and ultra-deep B images of 3 of these. Our V-band surface photometry extends to 29.5 magnitudes arcsec^-2. We convert the FUV and V-band photometry, along with Halpha photometry, into radial star formation rate profiles that are sensitive to timescales from 10 Myrs to the lifetime of the galaxy. We also compare the stellar distributions, surface brightness profiles, and star formation rate profiles to HI-line emission maps, gas s","authors_text":"Bruce G. Elmegreen, Deidre A. Hunter, Ed Anderson, Malanka Riabokin, Nick Wilsey, Philip Massey, Se-Heon Oh, Tyler E. Nordgren","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-27T20:16:23Z","title":"The Outer Disks of Dwarf Irregular Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.5587","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":"sha256:8fdfac9f6c21d4d5baac314bf549ee58fdd9d1788468dd81aad7bfa81a74057e","target":"record","created_at":"2026-05-18T02:01:08Z","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":"65f8dbae3552550cdd604d07bff0659e9b335a7b34f6af3e6aae15ed20ec1876","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-27T20:16:23Z","title_canon_sha256":"8a23b1bc590f24974ceec05fae786ebb6c9b4481e01f83dd8909dc099fbc6e56"},"schema_version":"1.0","source":{"id":"1107.5587","kind":"arxiv","version":1}},"canonical_sha256":"a354725bbcdfdbe0c06c08a95e5c1f953427f67cbb6ad47eebcba5395ef9ce5e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a354725bbcdfdbe0c06c08a95e5c1f953427f67cbb6ad47eebcba5395ef9ce5e","first_computed_at":"2026-05-18T02:01:08.653484Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:08.653484Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0fUCSAAbmYvK3lqNfwFBUzNWIefM/FvLGArMUfVXC762ShaF2qa0Ar4amWSobxUAdvBOawmwAUtlZrd6Gj44DA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:08.654038Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.5587","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8fdfac9f6c21d4d5baac314bf549ee58fdd9d1788468dd81aad7bfa81a74057e","sha256:84660430dc708639bc177849d77d23d6500e4b089c5d57a771b77902e4d70b56"],"state_sha256":"0db189e1c794b7e5ba25c1896523043653d3210bbc7bebcc8c3801c7ecd3f278"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lO7MEkr7wCSJe7BAHNG8B5GxLLvw2yUQDnLU3Skj4UijkgD6MW59NPJEQoJmzyYQqGAkQPAUSRImTzHDW9+JBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:24:33.304867Z","bundle_sha256":"d3dec6756cea842eb7c6e52030a3fc0bc341b99b5a2985a195d5f6ae38754032"}}