{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2006:VVI3RUPVIFMJSX2U26RO4W73YL","short_pith_number":"pith:VVI3RUPV","schema_version":"1.0","canonical_sha256":"ad51b8d1f54158995f54d7a2ee5bfbc2cba5f5189f52ed72d39fd3ad78804025","source":{"kind":"arxiv","id":"astro-ph/0612454","version":1},"attestation_state":"computed","paper":{"title":"Spectroscopy of z~6 i-dropout Galaxies: Frequency of Ly-alpha Emission and the Sizes of Ly-alpha Emitting Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. van der Wel, A. Zirm, B. P. Holden, C. C. Dow-Hygelund, D. Magee, G. D. Illingworth, H. Ford, M. Franx, P. G. van Dokkum, P. Rosati, R. Bouwens","submitted_at":"2006-12-18T20:56:03Z","abstract_excerpt":"We report on deep spectroscopy using LRIS on Keck I and FORS2 on the VLT of a sample of 22 candidate z~6 Lyman Break galaxies (LBGs) selected by the i-z> 1.3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z = 5.5 - 6.1, confirming the efficiency of the i-z color selection technique. Six of the confirmed galaxies show Ly-alpha emission. Assuming that the 14 objects without redshifts are z~6 LBGs, but lack detectable Ly-alpha emission lines, we infer that the fraction of Ly-alpha emitting LBGs with Ly-alpha equivalent widths greater than 20"},"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":"astro-ph/0612454","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-12-18T20:56:03Z","cross_cats_sorted":[],"title_canon_sha256":"3d58146b7539b1d8af0238d43c0387e58f4d65da541a26a23b8a49e048bf9dbe","abstract_canon_sha256":"7c4654af41afd94e178918d71a71f42e48f1662e68cd1660a51106293e4f7d2a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:36:20.597442Z","signature_b64":"g3HgFCPggQ4HIkydsvB0STRlfl0ozN0SJpqfHrWYCKy4+aTrhVLQ5F+JkjUqE/MKpzPQuwY138J+DnvRByLVBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ad51b8d1f54158995f54d7a2ee5bfbc2cba5f5189f52ed72d39fd3ad78804025","last_reissued_at":"2026-05-18T04:36:20.596851Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:36:20.596851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectroscopy of z~6 i-dropout Galaxies: Frequency of Ly-alpha Emission and the Sizes of Ly-alpha Emitting Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. van der Wel, A. Zirm, B. P. Holden, C. C. Dow-Hygelund, D. Magee, G. D. Illingworth, H. Ford, M. Franx, P. G. van Dokkum, P. Rosati, R. Bouwens","submitted_at":"2006-12-18T20:56:03Z","abstract_excerpt":"We report on deep spectroscopy using LRIS on Keck I and FORS2 on the VLT of a sample of 22 candidate z~6 Lyman Break galaxies (LBGs) selected by the i-z> 1.3 dropout criterion. Redshifts could be measured for eight objects. These redshifts are all in the range z = 5.5 - 6.1, confirming the efficiency of the i-z color selection technique. Six of the confirmed galaxies show Ly-alpha emission. Assuming that the 14 objects without redshifts are z~6 LBGs, but lack detectable Ly-alpha emission lines, we infer that the fraction of Ly-alpha emitting LBGs with Ly-alpha equivalent widths greater than 20"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0612454","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":"astro-ph/0612454","created_at":"2026-05-18T04:36:20.596932+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0612454v1","created_at":"2026-05-18T04:36:20.596932+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0612454","created_at":"2026-05-18T04:36:20.596932+00:00"},{"alias_kind":"pith_short_12","alias_value":"VVI3RUPVIFMJ","created_at":"2026-05-18T12:25:54.717736+00:00"},{"alias_kind":"pith_short_16","alias_value":"VVI3RUPVIFMJSX2U","created_at":"2026-05-18T12:25:54.717736+00:00"},{"alias_kind":"pith_short_8","alias_value":"VVI3RUPV","created_at":"2026-05-18T12:25:54.717736+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/VVI3RUPVIFMJSX2U26RO4W73YL","json":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL.json","graph_json":"https://pith.science/api/pith-number/VVI3RUPVIFMJSX2U26RO4W73YL/graph.json","events_json":"https://pith.science/api/pith-number/VVI3RUPVIFMJSX2U26RO4W73YL/events.json","paper":"https://pith.science/paper/VVI3RUPV"},"agent_actions":{"view_html":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL","download_json":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL.json","view_paper":"https://pith.science/paper/VVI3RUPV","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0612454&json=true","fetch_graph":"https://pith.science/api/pith-number/VVI3RUPVIFMJSX2U26RO4W73YL/graph.json","fetch_events":"https://pith.science/api/pith-number/VVI3RUPVIFMJSX2U26RO4W73YL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL/action/storage_attestation","attest_author":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL/action/author_attestation","sign_citation":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL/action/citation_signature","submit_replication":"https://pith.science/pith/VVI3RUPVIFMJSX2U26RO4W73YL/action/replication_record"}},"created_at":"2026-05-18T04:36:20.596932+00:00","updated_at":"2026-05-18T04:36:20.596932+00:00"}