{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:AT46R5RWXIZKOSBIO7B2SIAKKQ","short_pith_number":"pith:AT46R5RW","canonical_record":{"source":{"id":"astro-ph/0101228","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-01-14T15:48:25Z","cross_cats_sorted":[],"title_canon_sha256":"a5af9e33aabf3defb2daee5c3ec40f95dfd26ea1f3e3be24cd696d78f8b6f45d","abstract_canon_sha256":"be1b1df080d1cee67ddb987c13ce746fdb4f6433a569bd78da787bba83fa4f4c"},"schema_version":"1.0"},"canonical_sha256":"04f9e8f636ba32a7482877c3a9200a54213bb2d8bf8fa202feeebf5607cb9b00","source":{"kind":"arxiv","id":"astro-ph/0101228","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0101228","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0101228v2","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0101228","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"AT46R5RWXIZK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"AT46R5RWXIZKOSBI","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"AT46R5RW","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:AT46R5RWXIZKOSBIO7B2SIAKKQ","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0101228","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-01-14T15:48:25Z","cross_cats_sorted":[],"title_canon_sha256":"a5af9e33aabf3defb2daee5c3ec40f95dfd26ea1f3e3be24cd696d78f8b6f45d","abstract_canon_sha256":"be1b1df080d1cee67ddb987c13ce746fdb4f6433a569bd78da787bba83fa4f4c"},"schema_version":"1.0"},"canonical_sha256":"04f9e8f636ba32a7482877c3a9200a54213bb2d8bf8fa202feeebf5607cb9b00","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:10.633343Z","signature_b64":"wpvLdsvBoAJQyK+SRVj8seACJ6SffkFKN7Fr8sDPUNSE9g+LYp8OyG3L2tvSyxK+WznyzP6ky3QmC7WTSXoSAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"04f9e8f636ba32a7482877c3a9200a54213bb2d8bf8fa202feeebf5607cb9b00","last_reissued_at":"2026-05-18T00:48:10.632717Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:10.632717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0101228","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JyXynjY+y+2zcvI3XOUIbNuelZI4FSsTgGYT7+M5xiBlkpyphd0kjZ0VtotXQrvBQEF/sFpdfQI6PgKe7PQXCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T21:07:45.660230Z"},"content_sha256":"88afe467897bb4002b98f94d48e4d389b8d81a51fac8563228d1b178267431eb","schema_version":"1.0","event_id":"sha256:88afe467897bb4002b98f94d48e4d389b8d81a51fac8563228d1b178267431eb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:AT46R5RWXIZKOSBIO7B2SIAKKQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Using Gravitational Lensing to study HI clouds at high redshift","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Shiv Kumar Sethi, Somnath Bharadwaj, Tarun Deep Saini","submitted_at":"2001-01-14T15:48:25Z","abstract_excerpt":"We investigate the possibility of detecting HI emission from gravitationally lensed HI clouds (akin to damped Lyman-$\\alpha$ clouds) at high redshift by carrying out deep radio observations in the fields of known cluster lenses. Such observations will be possible with present radio telescopes only if the lens substantially magnifies the flux of the HI emission. While at present this holds the only possibility of detecting the HI emission from such clouds, it has the disadvantage of being restricted to clouds that lie very close to the caustics of the lens. We find that observations at a detect"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0101228","kind":"arxiv","version":2},"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":"2026-05-18T00:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9VgeWAitHlzFqPeYgwq23p0iKPtSCWyNbc3/iyX1c8Jey5nneOlO7y8wRPdoHk/W+zfAzR58P20DTL+L6zWwBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T21:07:45.660738Z"},"content_sha256":"26ddf62958aaafe4bdac1ed94468c760d77f05add446a81444d206b84543e2d5","schema_version":"1.0","event_id":"sha256:26ddf62958aaafe4bdac1ed94468c760d77f05add446a81444d206b84543e2d5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/bundle.json","state_url":"https://pith.science/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/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":"2026-05-29T21:07:45Z","links":{"resolver":"https://pith.science/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ","bundle":"https://pith.science/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/bundle.json","state":"https://pith.science/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AT46R5RWXIZKOSBIO7B2SIAKKQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:AT46R5RWXIZKOSBIO7B2SIAKKQ","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":"be1b1df080d1cee67ddb987c13ce746fdb4f6433a569bd78da787bba83fa4f4c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-01-14T15:48:25Z","title_canon_sha256":"a5af9e33aabf3defb2daee5c3ec40f95dfd26ea1f3e3be24cd696d78f8b6f45d"},"schema_version":"1.0","source":{"id":"astro-ph/0101228","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0101228","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0101228v2","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0101228","created_at":"2026-05-18T00:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"AT46R5RWXIZK","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"AT46R5RWXIZKOSBI","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"AT46R5RW","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:26ddf62958aaafe4bdac1ed94468c760d77f05add446a81444d206b84543e2d5","target":"graph","created_at":"2026-05-18T00:48:10Z","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":"We investigate the possibility of detecting HI emission from gravitationally lensed HI clouds (akin to damped Lyman-$\\alpha$ clouds) at high redshift by carrying out deep radio observations in the fields of known cluster lenses. Such observations will be possible with present radio telescopes only if the lens substantially magnifies the flux of the HI emission. While at present this holds the only possibility of detecting the HI emission from such clouds, it has the disadvantage of being restricted to clouds that lie very close to the caustics of the lens. We find that observations at a detect","authors_text":"Shiv Kumar Sethi, Somnath Bharadwaj, Tarun Deep Saini","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-01-14T15:48:25Z","title":"Using Gravitational Lensing to study HI clouds at high redshift"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0101228","kind":"arxiv","version":2},"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":"sha256:88afe467897bb4002b98f94d48e4d389b8d81a51fac8563228d1b178267431eb","target":"record","created_at":"2026-05-18T00:48:10Z","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":"be1b1df080d1cee67ddb987c13ce746fdb4f6433a569bd78da787bba83fa4f4c","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-01-14T15:48:25Z","title_canon_sha256":"a5af9e33aabf3defb2daee5c3ec40f95dfd26ea1f3e3be24cd696d78f8b6f45d"},"schema_version":"1.0","source":{"id":"astro-ph/0101228","kind":"arxiv","version":2}},"canonical_sha256":"04f9e8f636ba32a7482877c3a9200a54213bb2d8bf8fa202feeebf5607cb9b00","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"04f9e8f636ba32a7482877c3a9200a54213bb2d8bf8fa202feeebf5607cb9b00","first_computed_at":"2026-05-18T00:48:10.632717Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:48:10.632717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wpvLdsvBoAJQyK+SRVj8seACJ6SffkFKN7Fr8sDPUNSE9g+LYp8OyG3L2tvSyxK+WznyzP6ky3QmC7WTSXoSAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:48:10.633343Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0101228","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88afe467897bb4002b98f94d48e4d389b8d81a51fac8563228d1b178267431eb","sha256:26ddf62958aaafe4bdac1ed94468c760d77f05add446a81444d206b84543e2d5"],"state_sha256":"f147055c7c90937c7b7d5f55938fe5cd54f589df828ec041a577f5b4d3938665"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5be9panJswwEnwnpIOhpViFsu9LQf66/lm8+nDa584VIeXrYOST68IV/8LLd+F+U0UHmG3PPZk4XG2+nAwnhBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T21:07:45.663363Z","bundle_sha256":"18f2a2585c3dabdcc10508507ed242731ea712799a7e50136aea9c22cb8687f5"}}