{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WTPIQIAICZBXTYZVSL4QU3X5YQ","short_pith_number":"pith:WTPIQIAI","canonical_record":{"source":{"id":"1805.09851","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-24T18:53:14Z","cross_cats_sorted":[],"title_canon_sha256":"0487299944152898fadd0b12046bbe834f54877c4eae97c587939bdecd42fc20","abstract_canon_sha256":"62418340a43b576a151742989246ea4b664091bc6c42dd6304bda2d64363634e"},"schema_version":"1.0"},"canonical_sha256":"b4de882008164379e33592f90a6efdc4232ab0c08814b7f408c3cf06afaa3e90","source":{"kind":"arxiv","id":"1805.09851","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.09851","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"arxiv_version","alias_value":"1805.09851v1","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.09851","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"pith_short_12","alias_value":"WTPIQIAICZBX","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WTPIQIAICZBXTYZV","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WTPIQIAI","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WTPIQIAICZBXTYZVSL4QU3X5YQ","target":"record","payload":{"canonical_record":{"source":{"id":"1805.09851","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-24T18:53:14Z","cross_cats_sorted":[],"title_canon_sha256":"0487299944152898fadd0b12046bbe834f54877c4eae97c587939bdecd42fc20","abstract_canon_sha256":"62418340a43b576a151742989246ea4b664091bc6c42dd6304bda2d64363634e"},"schema_version":"1.0"},"canonical_sha256":"b4de882008164379e33592f90a6efdc4232ab0c08814b7f408c3cf06afaa3e90","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:41.441194Z","signature_b64":"bOnvYlRodWYzPlXzhUp647opjJFR3VskDFxDKAhSDW1sWqA4HQms5Su8Ts51W0TiEztWB/n9FYEZnNOZlhX6Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4de882008164379e33592f90a6efdc4232ab0c08814b7f408c3cf06afaa3e90","last_reissued_at":"2026-05-18T00:09:41.440711Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:41.440711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.09851","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":"2026-05-18T00:09:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s4iIBBB/wChwlhGZCMQqr9wIdXmyiIUJj4rOEE1T8wytk1II62zy1wawtgqi0vrMt+Byv0V1NSCAHDPTELQVDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:23:58.969170Z"},"content_sha256":"fb47df8f8ba6273dd6b9f2e17f141bff0e953f9a6aed734a24a704033288786d","schema_version":"1.0","event_id":"sha256:fb47df8f8ba6273dd6b9f2e17f141bff0e953f9a6aed734a24a704033288786d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WTPIQIAICZBXTYZVSL4QU3X5YQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection of the Galactic Warm Neutral Medium in HI 21cm absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) Indian Institute of Science, India, India], Jayaram N. Chengalur (1), Narendra Nath Patra (1), Nirupam Roy (2) [(1) National Centre for Radio Astrophysics, Nissim Kanekar (1)","submitted_at":"2018-05-24T18:53:14Z","abstract_excerpt":"We report a deep Giant Metrewave Radio Telescope (GMRT) search for Galactic H{\\sc i} 21cm absorption towards the quasar B0438$-$436, yielding the detection of wide, weak H{\\sc i} 21cm absorption, with a velocity-integrated H{\\sc i} 21cm optical depth of $0.0188 \\pm 0.0036$~km~s$^{-1}$. Comparing this with the H{\\sc i} column density measured in the Parkes Galactic All-Sky Survey gives a column density-weighted harmonic mean spin temperature of $3760 \\pm 365$~K, one of the highest measured in the Galaxy. This is consistent with most of the H{\\sc i} along the sightline arising in the stable warm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.09851","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":"2026-05-18T00:09:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bvhLcqXhVyGbooFxjZbXNHDd0n6qQWJPVo6dIPCHyfxnYAaJ1ivZZW88i2neKj74eOIkVyKkDjBW3lfVmqlPDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:23:58.969857Z"},"content_sha256":"c416344577bec12590da08ef4ff6216bc2442f0ca91614c04f02a3e8676d3091","schema_version":"1.0","event_id":"sha256:c416344577bec12590da08ef4ff6216bc2442f0ca91614c04f02a3e8676d3091"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/bundle.json","state_url":"https://pith.science/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/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":"2026-05-26T07:23:58Z","links":{"resolver":"https://pith.science/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ","bundle":"https://pith.science/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/bundle.json","state":"https://pith.science/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WTPIQIAICZBXTYZVSL4QU3X5YQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WTPIQIAICZBXTYZVSL4QU3X5YQ","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":"62418340a43b576a151742989246ea4b664091bc6c42dd6304bda2d64363634e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-24T18:53:14Z","title_canon_sha256":"0487299944152898fadd0b12046bbe834f54877c4eae97c587939bdecd42fc20"},"schema_version":"1.0","source":{"id":"1805.09851","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.09851","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"arxiv_version","alias_value":"1805.09851v1","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.09851","created_at":"2026-05-18T00:09:41Z"},{"alias_kind":"pith_short_12","alias_value":"WTPIQIAICZBX","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WTPIQIAICZBXTYZV","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WTPIQIAI","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:c416344577bec12590da08ef4ff6216bc2442f0ca91614c04f02a3e8676d3091","target":"graph","created_at":"2026-05-18T00:09:41Z","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 report a deep Giant Metrewave Radio Telescope (GMRT) search for Galactic H{\\sc i} 21cm absorption towards the quasar B0438$-$436, yielding the detection of wide, weak H{\\sc i} 21cm absorption, with a velocity-integrated H{\\sc i} 21cm optical depth of $0.0188 \\pm 0.0036$~km~s$^{-1}$. Comparing this with the H{\\sc i} column density measured in the Parkes Galactic All-Sky Survey gives a column density-weighted harmonic mean spin temperature of $3760 \\pm 365$~K, one of the highest measured in the Galaxy. This is consistent with most of the H{\\sc i} along the sightline arising in the stable warm","authors_text":"(2) Indian Institute of Science, India, India], Jayaram N. Chengalur (1), Narendra Nath Patra (1), Nirupam Roy (2) [(1) National Centre for Radio Astrophysics, Nissim Kanekar (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-24T18:53:14Z","title":"Detection of the Galactic Warm Neutral Medium in HI 21cm absorption"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.09851","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:fb47df8f8ba6273dd6b9f2e17f141bff0e953f9a6aed734a24a704033288786d","target":"record","created_at":"2026-05-18T00:09:41Z","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":"62418340a43b576a151742989246ea4b664091bc6c42dd6304bda2d64363634e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-24T18:53:14Z","title_canon_sha256":"0487299944152898fadd0b12046bbe834f54877c4eae97c587939bdecd42fc20"},"schema_version":"1.0","source":{"id":"1805.09851","kind":"arxiv","version":1}},"canonical_sha256":"b4de882008164379e33592f90a6efdc4232ab0c08814b7f408c3cf06afaa3e90","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4de882008164379e33592f90a6efdc4232ab0c08814b7f408c3cf06afaa3e90","first_computed_at":"2026-05-18T00:09:41.440711Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:41.440711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bOnvYlRodWYzPlXzhUp647opjJFR3VskDFxDKAhSDW1sWqA4HQms5Su8Ts51W0TiEztWB/n9FYEZnNOZlhX6Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:41.441194Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.09851","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fb47df8f8ba6273dd6b9f2e17f141bff0e953f9a6aed734a24a704033288786d","sha256:c416344577bec12590da08ef4ff6216bc2442f0ca91614c04f02a3e8676d3091"],"state_sha256":"c0f025bb1fb96bbf0818c96930b5d24c2b539c52549ffd2827a944e895cdeca7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3DV5zb2F96GtmUT+R4mAblf8WvteglNgBuJB6Uzq6U1q5weleqDMbTMBXSROhyGFPsathVRWCDgt9iTHaecCAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:23:58.973260Z","bundle_sha256":"ddbb757328074a52ed98b82403bda648cc1e80cc0a10fc880ebefe7b49e2e2f8"}}