{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:IRJ3K2TWB7BTUJSWFG3SL6DDCL","short_pith_number":"pith:IRJ3K2TW","schema_version":"1.0","canonical_sha256":"4453b56a760fc33a265629b725f86312ff181648fa4117fa1f2343969d83af03","source":{"kind":"arxiv","id":"1511.07448","version":2},"attestation_state":"computed","paper":{"title":"21-cm signature of the first sources in the Universe: Prospects of detection with SKA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"India), Kanan K. Datta (Presidency University, Raghunath Ghara (NCRA-TIFR, T. Roy Choudhury (NCRA-TIFR","submitted_at":"2015-11-23T21:00:15Z","abstract_excerpt":"Currently several low-frequency experiments are being planned to study the nature of the first stars using the redshifted 21-cm signal from the cosmic dawn and epoch of reionization. Using a one-dimensional radiative transfer code, we model the 21-cm signal pattern around the early sources for different source models, i.e., the metal-free Population III (PopIII) stars, primordial galaxies consisting of Population II (PopII) stars, mini-QSOs and high-mass X-ray binaries (HMXBs). We investigate the detectability of these sources by comparing the 21-cm visibility signal with the system noise appr"},"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":"1511.07448","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-11-23T21:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"76d3a8c2101776c8c18604dbf64d43777925e0a12247e49565028ae2f09309ab","abstract_canon_sha256":"a43aef9bd3d72c9701bcd2d02a9ecf8be519fba8704a82070a03f62e2ea668cc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:00.188631Z","signature_b64":"OYjzPnvPr9WavEOnhnlOQkWZadRfFm1iNMK2bBmM9D05MxCCer7a+H4sZi3oAfMUn8UAR9CkKMtqNe9GnuOOBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4453b56a760fc33a265629b725f86312ff181648fa4117fa1f2343969d83af03","last_reissued_at":"2026-05-18T01:15:00.188089Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:00.188089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"21-cm signature of the first sources in the Universe: Prospects of detection with SKA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"India), Kanan K. Datta (Presidency University, Raghunath Ghara (NCRA-TIFR, T. Roy Choudhury (NCRA-TIFR","submitted_at":"2015-11-23T21:00:15Z","abstract_excerpt":"Currently several low-frequency experiments are being planned to study the nature of the first stars using the redshifted 21-cm signal from the cosmic dawn and epoch of reionization. Using a one-dimensional radiative transfer code, we model the 21-cm signal pattern around the early sources for different source models, i.e., the metal-free Population III (PopIII) stars, primordial galaxies consisting of Population II (PopII) stars, mini-QSOs and high-mass X-ray binaries (HMXBs). We investigate the detectability of these sources by comparing the 21-cm visibility signal with the system noise appr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.07448","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":"1511.07448","created_at":"2026-05-18T01:15:00.188195+00:00"},{"alias_kind":"arxiv_version","alias_value":"1511.07448v2","created_at":"2026-05-18T01:15:00.188195+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.07448","created_at":"2026-05-18T01:15:00.188195+00:00"},{"alias_kind":"pith_short_12","alias_value":"IRJ3K2TWB7BT","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_16","alias_value":"IRJ3K2TWB7BTUJSW","created_at":"2026-05-18T12:29:25.134429+00:00"},{"alias_kind":"pith_short_8","alias_value":"IRJ3K2TW","created_at":"2026-05-18T12:29:25.134429+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/IRJ3K2TWB7BTUJSWFG3SL6DDCL","json":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL.json","graph_json":"https://pith.science/api/pith-number/IRJ3K2TWB7BTUJSWFG3SL6DDCL/graph.json","events_json":"https://pith.science/api/pith-number/IRJ3K2TWB7BTUJSWFG3SL6DDCL/events.json","paper":"https://pith.science/paper/IRJ3K2TW"},"agent_actions":{"view_html":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL","download_json":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL.json","view_paper":"https://pith.science/paper/IRJ3K2TW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1511.07448&json=true","fetch_graph":"https://pith.science/api/pith-number/IRJ3K2TWB7BTUJSWFG3SL6DDCL/graph.json","fetch_events":"https://pith.science/api/pith-number/IRJ3K2TWB7BTUJSWFG3SL6DDCL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL/action/storage_attestation","attest_author":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL/action/author_attestation","sign_citation":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL/action/citation_signature","submit_replication":"https://pith.science/pith/IRJ3K2TWB7BTUJSWFG3SL6DDCL/action/replication_record"}},"created_at":"2026-05-18T01:15:00.188195+00:00","updated_at":"2026-05-18T01:15:00.188195+00:00"}