{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:FM7QFYJGIDBMEQ4PYR6DYA544A","short_pith_number":"pith:FM7QFYJG","canonical_record":{"source":{"id":"1807.04298","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-11T18:00:12Z","cross_cats_sorted":[],"title_canon_sha256":"8b0f56261d819a753557fd8e4165a1c39b1d93589a30ef314cbd622f9f9ba7f0","abstract_canon_sha256":"a6e007f0eb7ea070b51a52c649af74ab4917070d866f9965a96b94a160dfce28"},"schema_version":"1.0"},"canonical_sha256":"2b3f02e12640c2c2438fc47c3c03bce01c2a108dfb66607a3a8775935d8fcc96","source":{"kind":"arxiv","id":"1807.04298","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.04298","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1807.04298v1","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.04298","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"FM7QFYJGIDBM","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FM7QFYJGIDBMEQ4P","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FM7QFYJG","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:FM7QFYJGIDBMEQ4PYR6DYA544A","target":"record","payload":{"canonical_record":{"source":{"id":"1807.04298","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-11T18:00:12Z","cross_cats_sorted":[],"title_canon_sha256":"8b0f56261d819a753557fd8e4165a1c39b1d93589a30ef314cbd622f9f9ba7f0","abstract_canon_sha256":"a6e007f0eb7ea070b51a52c649af74ab4917070d866f9965a96b94a160dfce28"},"schema_version":"1.0"},"canonical_sha256":"2b3f02e12640c2c2438fc47c3c03bce01c2a108dfb66607a3a8775935d8fcc96","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:10.880702Z","signature_b64":"QsNOQKLoH9QXkh5DrK3jno49AYunDf+phj6XXe8zWP/Wt6kk9vYlQDSAwyvEJY/usZ9kMy82fasVDI+kxusBDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2b3f02e12640c2c2438fc47c3c03bce01c2a108dfb66607a3a8775935d8fcc96","last_reissued_at":"2026-05-18T00:09:10.880183Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:10.880183Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.04298","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":"2026-05-18T00:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/ehtwW1k+Tgix+hSBQQOIUveLzDZZ5h3YvWCLhHLXYJ+NdlGF7RfYX7cqYuOYQcfpq/TdVBXVgfSJoZdn1puBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:57:23.608687Z"},"content_sha256":"a4707e741299f7c380c26118d278958348e6a69b8b0e5b32514d8688b044d858","schema_version":"1.0","event_id":"sha256:a4707e741299f7c380c26118d278958348e6a69b8b0e5b32514d8688b044d858"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:FM7QFYJGIDBMEQ4PYR6DYA544A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Prevalence of neutral gas in centres of merging galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Neeraj Gupta, Raghunathan Srianand, Rajeshwari Dutta","submitted_at":"2018-07-11T18:00:12Z","abstract_excerpt":"We present Giant Metrewave Radio Telescope and Very Large Array observations of HI 21-cm absorption in ten z<=0.2 galaxy mergers that host strong radio sources. Seven of these mergers show strong absorption [with N(HI) ~10^{21-22} cm^{-2}, for spin temperature of 100 K and unit covering factor], leading to a total detection rate of 83 +/- 17% in low-z radio-loud galaxy mergers. This is ~3-4 times higher than that found for intrinsic HI 21-cm absorption in low-z radio sources in general. The fraction of intrinsic absorbers that are associated with mergers increases with increasing N(HI) thresho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.04298","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":"2026-05-18T00:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FW034NLeCqNWBSKBqbXHCkfQsnlUGjpAa1LMrOTPBD9qa9Rvf4+2t04iFaKvr27x0JGcJ5p3YmAVioYjojMeBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:57:23.609342Z"},"content_sha256":"b5758c53b0ec0c0f56db88e6846af7a2606a8b5fcd9f6e1df9945ea84d19fed0","schema_version":"1.0","event_id":"sha256:b5758c53b0ec0c0f56db88e6846af7a2606a8b5fcd9f6e1df9945ea84d19fed0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/bundle.json","state_url":"https://pith.science/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/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":"2026-05-27T11:57:23Z","links":{"resolver":"https://pith.science/pith/FM7QFYJGIDBMEQ4PYR6DYA544A","bundle":"https://pith.science/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/bundle.json","state":"https://pith.science/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FM7QFYJGIDBMEQ4PYR6DYA544A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FM7QFYJGIDBMEQ4PYR6DYA544A","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":"a6e007f0eb7ea070b51a52c649af74ab4917070d866f9965a96b94a160dfce28","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-11T18:00:12Z","title_canon_sha256":"8b0f56261d819a753557fd8e4165a1c39b1d93589a30ef314cbd622f9f9ba7f0"},"schema_version":"1.0","source":{"id":"1807.04298","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.04298","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1807.04298v1","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.04298","created_at":"2026-05-18T00:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"FM7QFYJGIDBM","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FM7QFYJGIDBMEQ4P","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FM7QFYJG","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:b5758c53b0ec0c0f56db88e6846af7a2606a8b5fcd9f6e1df9945ea84d19fed0","target":"graph","created_at":"2026-05-18T00:09:10Z","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 present Giant Metrewave Radio Telescope and Very Large Array observations of HI 21-cm absorption in ten z<=0.2 galaxy mergers that host strong radio sources. Seven of these mergers show strong absorption [with N(HI) ~10^{21-22} cm^{-2}, for spin temperature of 100 K and unit covering factor], leading to a total detection rate of 83 +/- 17% in low-z radio-loud galaxy mergers. This is ~3-4 times higher than that found for intrinsic HI 21-cm absorption in low-z radio sources in general. The fraction of intrinsic absorbers that are associated with mergers increases with increasing N(HI) thresho","authors_text":"Neeraj Gupta, Raghunathan Srianand, Rajeshwari Dutta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-11T18:00:12Z","title":"Prevalence of neutral gas in centres of merging galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.04298","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:a4707e741299f7c380c26118d278958348e6a69b8b0e5b32514d8688b044d858","target":"record","created_at":"2026-05-18T00:09:10Z","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":"a6e007f0eb7ea070b51a52c649af74ab4917070d866f9965a96b94a160dfce28","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-11T18:00:12Z","title_canon_sha256":"8b0f56261d819a753557fd8e4165a1c39b1d93589a30ef314cbd622f9f9ba7f0"},"schema_version":"1.0","source":{"id":"1807.04298","kind":"arxiv","version":1}},"canonical_sha256":"2b3f02e12640c2c2438fc47c3c03bce01c2a108dfb66607a3a8775935d8fcc96","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2b3f02e12640c2c2438fc47c3c03bce01c2a108dfb66607a3a8775935d8fcc96","first_computed_at":"2026-05-18T00:09:10.880183Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:10.880183Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QsNOQKLoH9QXkh5DrK3jno49AYunDf+phj6XXe8zWP/Wt6kk9vYlQDSAwyvEJY/usZ9kMy82fasVDI+kxusBDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:10.880702Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.04298","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a4707e741299f7c380c26118d278958348e6a69b8b0e5b32514d8688b044d858","sha256:b5758c53b0ec0c0f56db88e6846af7a2606a8b5fcd9f6e1df9945ea84d19fed0"],"state_sha256":"30862fc2eeaefdbb23f5b1afe1ea59b5d3dda891ef884ba3e03ae998fa5828f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VwQ7mPfjSI5lfH8qDTUuL2iSLyTHjNX89mEBF6VhHpP4WHlhSZKnH8EUW6IR0ivzcuJELvH7zIwdOUe1+r9wBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T11:57:23.612950Z","bundle_sha256":"86ede8844c9c2b6ee618d0bbf3e609579eb8d034f5c7be08800c52f0d222c31c"}}