{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:WVB3BLUVT3THIGQHBGMZLBHO5F","short_pith_number":"pith:WVB3BLUV","schema_version":"1.0","canonical_sha256":"b543b0ae959ee6741a0709999584eee9797cb75f0953438bcb690b7d2c97c91a","source":{"kind":"arxiv","id":"1509.02158","version":2},"attestation_state":"computed","paper":{"title":"Constraints on the temperature of the intergalactic medium at z=8.4 with 21-cm observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrei Mesinger, Bradley Greig, Jonathan C. Pober","submitted_at":"2015-09-07T20:05:11Z","abstract_excerpt":"We compute robust lower limits on the spin temperature, $T_{\\rm S}$, of the $z=8.4$ intergalactic medium (IGM), implied by the upper limits on the 21-cm power spectrum recently measured by PAPER-64. Unlike previous studies which used a single epoch of reionization (EoR) model, our approach samples a large parameter space of EoR models: the dominant uncertainty when estimating constraints on $T_{\\rm S}$. Allowing $T_{\\rm S}$ to be a free parameter and marginalizing over EoR parameters in our Markov Chain Monte Carlo code 21CMMC, we infer $T_{\\rm S}\\ge3 {\\rm K}$ (corresponding approximately to $"},"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":"1509.02158","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-09-07T20:05:11Z","cross_cats_sorted":[],"title_canon_sha256":"6225fa4ace29ba26827e5e0484bd0c93eb62a4e7926e03241b42e2cbf98f5117","abstract_canon_sha256":"1e6cb6cfea6f9f22702a22539361efa1d81aba2a81179cd0e7cff00031714cc2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:24:18.339872Z","signature_b64":"QZhAKyz99Go31hvgiDaxtbatZWlRUxP4f1lmHRMxVCMLKH2vtrXf/wRtM1PTDnXJ1I7x6FFBYZPVI/jX4LkxAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b543b0ae959ee6741a0709999584eee9797cb75f0953438bcb690b7d2c97c91a","last_reissued_at":"2026-05-18T01:24:18.339418Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:24:18.339418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on the temperature of the intergalactic medium at z=8.4 with 21-cm observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrei Mesinger, Bradley Greig, Jonathan C. Pober","submitted_at":"2015-09-07T20:05:11Z","abstract_excerpt":"We compute robust lower limits on the spin temperature, $T_{\\rm S}$, of the $z=8.4$ intergalactic medium (IGM), implied by the upper limits on the 21-cm power spectrum recently measured by PAPER-64. Unlike previous studies which used a single epoch of reionization (EoR) model, our approach samples a large parameter space of EoR models: the dominant uncertainty when estimating constraints on $T_{\\rm S}$. Allowing $T_{\\rm S}$ to be a free parameter and marginalizing over EoR parameters in our Markov Chain Monte Carlo code 21CMMC, we infer $T_{\\rm S}\\ge3 {\\rm K}$ (corresponding approximately to $"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.02158","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1509.02158","created_at":"2026-05-18T01:24:18.339488+00:00"},{"alias_kind":"arxiv_version","alias_value":"1509.02158v2","created_at":"2026-05-18T01:24:18.339488+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.02158","created_at":"2026-05-18T01:24:18.339488+00:00"},{"alias_kind":"pith_short_12","alias_value":"WVB3BLUVT3TH","created_at":"2026-05-18T12:29:47.479230+00:00"},{"alias_kind":"pith_short_16","alias_value":"WVB3BLUVT3THIGQH","created_at":"2026-05-18T12:29:47.479230+00:00"},{"alias_kind":"pith_short_8","alias_value":"WVB3BLUV","created_at":"2026-05-18T12:29:47.479230+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/WVB3BLUVT3THIGQHBGMZLBHO5F","json":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F.json","graph_json":"https://pith.science/api/pith-number/WVB3BLUVT3THIGQHBGMZLBHO5F/graph.json","events_json":"https://pith.science/api/pith-number/WVB3BLUVT3THIGQHBGMZLBHO5F/events.json","paper":"https://pith.science/paper/WVB3BLUV"},"agent_actions":{"view_html":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F","download_json":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F.json","view_paper":"https://pith.science/paper/WVB3BLUV","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1509.02158&json=true","fetch_graph":"https://pith.science/api/pith-number/WVB3BLUVT3THIGQHBGMZLBHO5F/graph.json","fetch_events":"https://pith.science/api/pith-number/WVB3BLUVT3THIGQHBGMZLBHO5F/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F/action/storage_attestation","attest_author":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F/action/author_attestation","sign_citation":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F/action/citation_signature","submit_replication":"https://pith.science/pith/WVB3BLUVT3THIGQHBGMZLBHO5F/action/replication_record"}},"created_at":"2026-05-18T01:24:18.339488+00:00","updated_at":"2026-05-18T01:24:18.339488+00:00"}