{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2020:XCFMVWVIOJISJITGWQMGRBY4IE","short_pith_number":"pith:XCFMVWVI","schema_version":"1.0","canonical_sha256":"b88acadaa8725124a266b41868871c412fd774a0c012749e80ff672aab26216d","source":{"kind":"arxiv","id":"2008.07578","version":1},"attestation_state":"computed","paper":{"title":"The evolution of neutral hydrogen over the past 11 Gyr via HI 21 cm absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam K. Leroy, Alberto D. Bolatto, Jeremy Darling, Kathryn Grasha","submitted_at":"2020-08-17T19:07:39Z","abstract_excerpt":"We present the results of a blind search for intervening HI 21 cm absorption toward 260 radio sources in the redshift range 0<z<2.74 with the Green Bank Telescope. The survey has the sensitivity to detect sub-damped Lyman-alpha (DLA) systems for HI spin temperatures $T_s/f$ = 100 K, and despite the successful re-detection of ten known 21 cm absorbers in the sample, we detect no new absorption lines in the full survey. Sources detected in 21 cm absorption were also searched for hydroxyl (OH) 18 cm absorption and we re-detect 1667 MHz OH absorption toward PKS 1830-211. We searched for intervenin"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2008.07578","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-08-17T19:07:39Z","cross_cats_sorted":[],"title_canon_sha256":"098275fbf00f7ba1fe939010ef503b5fc1548b6e532343bac193bd750c0cebd0","abstract_canon_sha256":"628f66d86624010f6e442a0c7ed05dbfdcbf788f9d2618da0203a4732bf96525"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:29:14.788769Z","signature_b64":"wtd+UXPVfmh9uYO7YlCPmnQynwLARd46PVpLUIb2Y3FD5Kb12YR1oM7reoHnr3ojDmYHV003kgxc5z2AFdw4Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b88acadaa8725124a266b41868871c412fd774a0c012749e80ff672aab26216d","last_reissued_at":"2026-07-05T01:29:14.788348Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:29:14.788348Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The evolution of neutral hydrogen over the past 11 Gyr via HI 21 cm absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam K. Leroy, Alberto D. Bolatto, Jeremy Darling, Kathryn Grasha","submitted_at":"2020-08-17T19:07:39Z","abstract_excerpt":"We present the results of a blind search for intervening HI 21 cm absorption toward 260 radio sources in the redshift range 0<z<2.74 with the Green Bank Telescope. The survey has the sensitivity to detect sub-damped Lyman-alpha (DLA) systems for HI spin temperatures $T_s/f$ = 100 K, and despite the successful re-detection of ten known 21 cm absorbers in the sample, we detect no new absorption lines in the full survey. Sources detected in 21 cm absorption were also searched for hydroxyl (OH) 18 cm absorption and we re-detect 1667 MHz OH absorption toward PKS 1830-211. We searched for intervenin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.07578","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2008.07578/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2008.07578","created_at":"2026-07-05T01:29:14.788404+00:00"},{"alias_kind":"arxiv_version","alias_value":"2008.07578v1","created_at":"2026-07-05T01:29:14.788404+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.07578","created_at":"2026-07-05T01:29:14.788404+00:00"},{"alias_kind":"pith_short_12","alias_value":"XCFMVWVIOJIS","created_at":"2026-07-05T01:29:14.788404+00:00"},{"alias_kind":"pith_short_16","alias_value":"XCFMVWVIOJISJITG","created_at":"2026-07-05T01:29:14.788404+00:00"},{"alias_kind":"pith_short_8","alias_value":"XCFMVWVI","created_at":"2026-07-05T01:29:14.788404+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE","json":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE.json","graph_json":"https://pith.science/api/pith-number/XCFMVWVIOJISJITGWQMGRBY4IE/graph.json","events_json":"https://pith.science/api/pith-number/XCFMVWVIOJISJITGWQMGRBY4IE/events.json","paper":"https://pith.science/paper/XCFMVWVI"},"agent_actions":{"view_html":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE","download_json":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE.json","view_paper":"https://pith.science/paper/XCFMVWVI","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2008.07578&json=true","fetch_graph":"https://pith.science/api/pith-number/XCFMVWVIOJISJITGWQMGRBY4IE/graph.json","fetch_events":"https://pith.science/api/pith-number/XCFMVWVIOJISJITGWQMGRBY4IE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE/action/storage_attestation","attest_author":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE/action/author_attestation","sign_citation":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE/action/citation_signature","submit_replication":"https://pith.science/pith/XCFMVWVIOJISJITGWQMGRBY4IE/action/replication_record"}},"created_at":"2026-07-05T01:29:14.788404+00:00","updated_at":"2026-07-05T01:29:14.788404+00:00"}