{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:LBAUMRSPSPKWPAVGQBY7J2Q5DW","short_pith_number":"pith:LBAUMRSP","schema_version":"1.0","canonical_sha256":"584146464f93d56782a68071f4ea1d1d957c52a13c01a0e360af7af63bf81487","source":{"kind":"arxiv","id":"1002.4356","version":1},"attestation_state":"computed","paper":{"title":"Searching for the earliest galaxies in the 21 cm forest","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Francisco S. Kitaura, Xuelei Chen, Yidong Xu","submitted_at":"2010-02-23T15:52:20Z","abstract_excerpt":"We use a model developed by Xu et al. (2010) to compute the 21 cm line absorption signatures imprinted by star-forming dwarf galaxies (DGs) and starless minihalos (MHs). The method, based on a statistical comparison of the equivalent width (W_\\nu) distribution and flux correlation function, allows us to derive a simple selection criteria for candidate DGs at very high (z >= 8) redshift. We find that ~ 18% of the total number of DGs along a line of sight to a target radio source (GRB or quasar) can be identified by the condition W_\\nu < 0; these objects correspond to the high-mass tail of the D"},"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":"1002.4356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-23T15:52:20Z","cross_cats_sorted":[],"title_canon_sha256":"932733b07c3a445b2b3219f2cefb1b4897b0700f6338a750b5b3105b1b5a5b50","abstract_canon_sha256":"6819f3463b1a4e72978515b46d905dbd73ee5404a0c8bdd03151c094fc472cf6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:27:47.735529Z","signature_b64":"E3ts5FPrhpI9XdR24puy7YKzNmGEeMsNDl1ReLNzXKOgMVD7xQJO4NmvpJtT41y8SKBnb7aAoSXLc9a1AqnKAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"584146464f93d56782a68071f4ea1d1d957c52a13c01a0e360af7af63bf81487","last_reissued_at":"2026-05-18T04:27:47.734878Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:27:47.734878Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Searching for the earliest galaxies in the 21 cm forest","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Francisco S. Kitaura, Xuelei Chen, Yidong Xu","submitted_at":"2010-02-23T15:52:20Z","abstract_excerpt":"We use a model developed by Xu et al. (2010) to compute the 21 cm line absorption signatures imprinted by star-forming dwarf galaxies (DGs) and starless minihalos (MHs). The method, based on a statistical comparison of the equivalent width (W_\\nu) distribution and flux correlation function, allows us to derive a simple selection criteria for candidate DGs at very high (z >= 8) redshift. We find that ~ 18% of the total number of DGs along a line of sight to a target radio source (GRB or quasar) can be identified by the condition W_\\nu < 0; these objects correspond to the high-mass tail of the D"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.4356","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1002.4356","created_at":"2026-05-18T04:27:47.734982+00:00"},{"alias_kind":"arxiv_version","alias_value":"1002.4356v1","created_at":"2026-05-18T04:27:47.734982+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.4356","created_at":"2026-05-18T04:27:47.734982+00:00"},{"alias_kind":"pith_short_12","alias_value":"LBAUMRSPSPKW","created_at":"2026-05-18T12:26:10.704358+00:00"},{"alias_kind":"pith_short_16","alias_value":"LBAUMRSPSPKWPAVG","created_at":"2026-05-18T12:26:10.704358+00:00"},{"alias_kind":"pith_short_8","alias_value":"LBAUMRSP","created_at":"2026-05-18T12:26:10.704358+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/LBAUMRSPSPKWPAVGQBY7J2Q5DW","json":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW.json","graph_json":"https://pith.science/api/pith-number/LBAUMRSPSPKWPAVGQBY7J2Q5DW/graph.json","events_json":"https://pith.science/api/pith-number/LBAUMRSPSPKWPAVGQBY7J2Q5DW/events.json","paper":"https://pith.science/paper/LBAUMRSP"},"agent_actions":{"view_html":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW","download_json":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW.json","view_paper":"https://pith.science/paper/LBAUMRSP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1002.4356&json=true","fetch_graph":"https://pith.science/api/pith-number/LBAUMRSPSPKWPAVGQBY7J2Q5DW/graph.json","fetch_events":"https://pith.science/api/pith-number/LBAUMRSPSPKWPAVGQBY7J2Q5DW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW/action/storage_attestation","attest_author":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW/action/author_attestation","sign_citation":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW/action/citation_signature","submit_replication":"https://pith.science/pith/LBAUMRSPSPKWPAVGQBY7J2Q5DW/action/replication_record"}},"created_at":"2026-05-18T04:27:47.734982+00:00","updated_at":"2026-05-18T04:27:47.734982+00:00"}