{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:IVLU34FWM5BGNFEWB3XWCQMVXV","short_pith_number":"pith:IVLU34FW","canonical_record":{"source":{"id":"1012.3236","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-12-15T06:44:52Z","cross_cats_sorted":[],"title_canon_sha256":"4d272708501f587ee4bceb51c7cb7f619e05786b20dde43be1f2a7ea9beadec7","abstract_canon_sha256":"bf0c8b0522e70a984128446f3d8ed31c12023d86578fa9a481a5290fb6186e8d"},"schema_version":"1.0"},"canonical_sha256":"45574df0b667426694960eef614195bd793fba4284e5ed187fd0865824c48e5f","source":{"kind":"arxiv","id":"1012.3236","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1012.3236","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"arxiv_version","alias_value":"1012.3236v1","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.3236","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"pith_short_12","alias_value":"IVLU34FWM5BG","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"IVLU34FWM5BGNFEW","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"IVLU34FW","created_at":"2026-05-18T12:26:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:IVLU34FWM5BGNFEWB3XWCQMVXV","target":"record","payload":{"canonical_record":{"source":{"id":"1012.3236","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-12-15T06:44:52Z","cross_cats_sorted":[],"title_canon_sha256":"4d272708501f587ee4bceb51c7cb7f619e05786b20dde43be1f2a7ea9beadec7","abstract_canon_sha256":"bf0c8b0522e70a984128446f3d8ed31c12023d86578fa9a481a5290fb6186e8d"},"schema_version":"1.0"},"canonical_sha256":"45574df0b667426694960eef614195bd793fba4284e5ed187fd0865824c48e5f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:24.601462Z","signature_b64":"ENkoN3/y7CSulTOWxfuZWJUXlXxPK6xskdcKaRPcQJy2iQAQN4jRaYX+ebwFveRPjLT4uZpcNRpTrAYfJ1GkBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"45574df0b667426694960eef614195bd793fba4284e5ed187fd0865824c48e5f","last_reissued_at":"2026-05-18T02:04:24.600955Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:24.600955Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1012.3236","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":"2026-05-18T02:04:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oeVUmk8koxmDloCqZtTDuvFl5CFqrm37Gmkutrk5dI6gAjtacFVz7QY6UlRHmGSJ7frsgdx7IP/vBo5RIhc5Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:37:15.270795Z"},"content_sha256":"04f6cce053c29636767fada5cfa9c89f6292feef318f1831ab27259f58aa28e2","schema_version":"1.0","event_id":"sha256:04f6cce053c29636767fada5cfa9c89f6292feef318f1831ab27259f58aa28e2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:IVLU34FWM5BGNFEWB3XWCQMVXV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The WSRT Virgo HI filament survey I; Total Power Data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Attila Popping, Robert Braun","submitted_at":"2010-12-15T06:44:52Z","abstract_excerpt":"Observations of neutral hydrogen can provide a wealth of information about the kinematics of galaxies. To learn more about the large scale structures and accretion processes, the extended environment of galaxies have to be observed. Numerical simulations predict a cosmic web of extended structures and gaseous filaments. To observe the direct vicinity of galaxies, column densities have to be achieved that probe the regime of Lyman limit systems. Typically HI observations are limited to a brightness sensitivity of NHI ~ 10^19 cm-2 but this has to be improved by ~2 orders of magnitude. With the W"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.3236","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":"2026-05-18T02:04:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZGFTHvAVjiaQ8K7AI4OASTZIrTVM9EdYWbY5vRPbZRRW17wLS0zpFdnngv0DiC1HSOjDlY9G/VmnHpRG/dN9Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T07:37:15.271507Z"},"content_sha256":"335e37695807433f13556fe7655ba04cb95a6367b99f7b2afc5de74894eecd8c","schema_version":"1.0","event_id":"sha256:335e37695807433f13556fe7655ba04cb95a6367b99f7b2afc5de74894eecd8c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/bundle.json","state_url":"https://pith.science/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/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":"2026-05-30T07:37:15Z","links":{"resolver":"https://pith.science/pith/IVLU34FWM5BGNFEWB3XWCQMVXV","bundle":"https://pith.science/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/bundle.json","state":"https://pith.science/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IVLU34FWM5BGNFEWB3XWCQMVXV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:IVLU34FWM5BGNFEWB3XWCQMVXV","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":"bf0c8b0522e70a984128446f3d8ed31c12023d86578fa9a481a5290fb6186e8d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-12-15T06:44:52Z","title_canon_sha256":"4d272708501f587ee4bceb51c7cb7f619e05786b20dde43be1f2a7ea9beadec7"},"schema_version":"1.0","source":{"id":"1012.3236","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1012.3236","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"arxiv_version","alias_value":"1012.3236v1","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.3236","created_at":"2026-05-18T02:04:24Z"},{"alias_kind":"pith_short_12","alias_value":"IVLU34FWM5BG","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"IVLU34FWM5BGNFEW","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"IVLU34FW","created_at":"2026-05-18T12:26:09Z"}],"graph_snapshots":[{"event_id":"sha256:335e37695807433f13556fe7655ba04cb95a6367b99f7b2afc5de74894eecd8c","target":"graph","created_at":"2026-05-18T02:04:24Z","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":"Observations of neutral hydrogen can provide a wealth of information about the kinematics of galaxies. To learn more about the large scale structures and accretion processes, the extended environment of galaxies have to be observed. Numerical simulations predict a cosmic web of extended structures and gaseous filaments. To observe the direct vicinity of galaxies, column densities have to be achieved that probe the regime of Lyman limit systems. Typically HI observations are limited to a brightness sensitivity of NHI ~ 10^19 cm-2 but this has to be improved by ~2 orders of magnitude. With the W","authors_text":"Attila Popping, Robert Braun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-12-15T06:44:52Z","title":"The WSRT Virgo HI filament survey I; Total Power Data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.3236","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":"sha256:04f6cce053c29636767fada5cfa9c89f6292feef318f1831ab27259f58aa28e2","target":"record","created_at":"2026-05-18T02:04:24Z","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":"bf0c8b0522e70a984128446f3d8ed31c12023d86578fa9a481a5290fb6186e8d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-12-15T06:44:52Z","title_canon_sha256":"4d272708501f587ee4bceb51c7cb7f619e05786b20dde43be1f2a7ea9beadec7"},"schema_version":"1.0","source":{"id":"1012.3236","kind":"arxiv","version":1}},"canonical_sha256":"45574df0b667426694960eef614195bd793fba4284e5ed187fd0865824c48e5f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"45574df0b667426694960eef614195bd793fba4284e5ed187fd0865824c48e5f","first_computed_at":"2026-05-18T02:04:24.600955Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:24.600955Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ENkoN3/y7CSulTOWxfuZWJUXlXxPK6xskdcKaRPcQJy2iQAQN4jRaYX+ebwFveRPjLT4uZpcNRpTrAYfJ1GkBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:24.601462Z","signed_message":"canonical_sha256_bytes"},"source_id":"1012.3236","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:04f6cce053c29636767fada5cfa9c89f6292feef318f1831ab27259f58aa28e2","sha256:335e37695807433f13556fe7655ba04cb95a6367b99f7b2afc5de74894eecd8c"],"state_sha256":"6afa4ac00546a94a82721cd609e54cc5ba13270cfc93c78d316f3219f93a1b18"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vqGD7P3zeX7vSck+7PMZNdbSdjDQx5QeSO12CsA4Jx2NlI7APvbX6GfGgL7Wb4ci31M9x4nbot+47edkyitsCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T07:37:15.275425Z","bundle_sha256":"535747e96541c04f74755c971f792b06fe9abba3cd33cf27d25b8c7bcccdc8af"}}