{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:WU6KIVEW6KDIX2WULA2OLM2VRB","short_pith_number":"pith:WU6KIVEW","schema_version":"1.0","canonical_sha256":"b53ca45496f2868bead45834e5b35588500c1c14df26eba1a40f09c2c3f7193a","source":{"kind":"arxiv","id":"2106.00119","version":1},"attestation_state":"computed","paper":{"title":"Estimation of the CMB temperature from atomic C\\,{\\sc i} and molecular CO lines in the interstellar medium of early galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A.V. Ivanchik, P. Noterdaeme, P. Petitjean, R. Srianand, V.V. Klimenko","submitted_at":"2021-05-31T22:13:04Z","abstract_excerpt":"The linear increase of the cosmic microwave background (CMB) temperature with cosmological redshift, $T_{\\rm CMB} = T_0(1 + z)$, is a prediction of the standard cosmological $\\Lambda$CDM model. There are currently two methods to measure this dependence at redshift $z>0$, and that is equally important to estimate the CMB temperature $T_0$ at the present epoch $z=0$. The first method is based on the Sunyaev-Zeldovich (SZ) effect for a galaxy cluster. aThe second method is based on the analysis of the populations of atomic and molecular energy levels observed in the absorption spectra of quasars."},"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":"2106.00119","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-05-31T22:13:04Z","cross_cats_sorted":[],"title_canon_sha256":"44c3d64a75a62f54f1495781565439bf71f1a73e865749481b2cc6daba168a55","abstract_canon_sha256":"b7b166f86b89b67892e28820bf91624468063ee6ccee4a80ede494d0166e9374"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:49:01.460003Z","signature_b64":"oqe+oUogk+jGfNQgMiRpwPTcjuoeytrwb6RWTy9dXE18CXzuHX/sgs6iA9FXAEgar61P6avroK+Nui87/riQBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b53ca45496f2868bead45834e5b35588500c1c14df26eba1a40f09c2c3f7193a","last_reissued_at":"2026-07-05T02:49:01.459535Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:49:01.459535Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Estimation of the CMB temperature from atomic C\\,{\\sc i} and molecular CO lines in the interstellar medium of early galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A.V. Ivanchik, P. Noterdaeme, P. Petitjean, R. Srianand, V.V. Klimenko","submitted_at":"2021-05-31T22:13:04Z","abstract_excerpt":"The linear increase of the cosmic microwave background (CMB) temperature with cosmological redshift, $T_{\\rm CMB} = T_0(1 + z)$, is a prediction of the standard cosmological $\\Lambda$CDM model. There are currently two methods to measure this dependence at redshift $z>0$, and that is equally important to estimate the CMB temperature $T_0$ at the present epoch $z=0$. The first method is based on the Sunyaev-Zeldovich (SZ) effect for a galaxy cluster. aThe second method is based on the analysis of the populations of atomic and molecular energy levels observed in the absorption spectra of quasars."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2106.00119","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/2106.00119/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":"2106.00119","created_at":"2026-07-05T02:49:01.459584+00:00"},{"alias_kind":"arxiv_version","alias_value":"2106.00119v1","created_at":"2026-07-05T02:49:01.459584+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2106.00119","created_at":"2026-07-05T02:49:01.459584+00:00"},{"alias_kind":"pith_short_12","alias_value":"WU6KIVEW6KDI","created_at":"2026-07-05T02:49:01.459584+00:00"},{"alias_kind":"pith_short_16","alias_value":"WU6KIVEW6KDIX2WU","created_at":"2026-07-05T02:49:01.459584+00:00"},{"alias_kind":"pith_short_8","alias_value":"WU6KIVEW","created_at":"2026-07-05T02:49:01.459584+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/WU6KIVEW6KDIX2WULA2OLM2VRB","json":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB.json","graph_json":"https://pith.science/api/pith-number/WU6KIVEW6KDIX2WULA2OLM2VRB/graph.json","events_json":"https://pith.science/api/pith-number/WU6KIVEW6KDIX2WULA2OLM2VRB/events.json","paper":"https://pith.science/paper/WU6KIVEW"},"agent_actions":{"view_html":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB","download_json":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB.json","view_paper":"https://pith.science/paper/WU6KIVEW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2106.00119&json=true","fetch_graph":"https://pith.science/api/pith-number/WU6KIVEW6KDIX2WULA2OLM2VRB/graph.json","fetch_events":"https://pith.science/api/pith-number/WU6KIVEW6KDIX2WULA2OLM2VRB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB/action/storage_attestation","attest_author":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB/action/author_attestation","sign_citation":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB/action/citation_signature","submit_replication":"https://pith.science/pith/WU6KIVEW6KDIX2WULA2OLM2VRB/action/replication_record"}},"created_at":"2026-07-05T02:49:01.459584+00:00","updated_at":"2026-07-05T02:49:01.459584+00:00"}