{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:PDVROPPD2CJVVBJ5BD75H6WUMC","short_pith_number":"pith:PDVROPPD","canonical_record":{"source":{"id":"1311.0057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-31T22:40:47Z","cross_cats_sorted":[],"title_canon_sha256":"6d8f571a4a876406214e2b98cf2a6877d5f317441c4938a4351041689b1a5a4a","abstract_canon_sha256":"f338120a5d59737ff61ea83ace0c1e2cebbcc8d754aa29387e9a87c6b34dbf04"},"schema_version":"1.0"},"canonical_sha256":"78eb173de3d0935a853d08ffd3fad460b03562915768a8eb77f7e6182aa56389","source":{"kind":"arxiv","id":"1311.0057","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.0057","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"arxiv_version","alias_value":"1311.0057v2","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.0057","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"pith_short_12","alias_value":"PDVROPPD2CJV","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"PDVROPPD2CJVVBJ5","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"PDVROPPD","created_at":"2026-05-18T12:27:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:PDVROPPD2CJVVBJ5BD75H6WUMC","target":"record","payload":{"canonical_record":{"source":{"id":"1311.0057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-31T22:40:47Z","cross_cats_sorted":[],"title_canon_sha256":"6d8f571a4a876406214e2b98cf2a6877d5f317441c4938a4351041689b1a5a4a","abstract_canon_sha256":"f338120a5d59737ff61ea83ace0c1e2cebbcc8d754aa29387e9a87c6b34dbf04"},"schema_version":"1.0"},"canonical_sha256":"78eb173de3d0935a853d08ffd3fad460b03562915768a8eb77f7e6182aa56389","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:40.169889Z","signature_b64":"LI+nKdy9Ng5+YzSxrxpB91OBLNTwp+PaFoKB+X4Nc0KGmGUszyuzwg2NHsk/PIginP9Xz8XsRHGH1l8CpbBxDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"78eb173de3d0935a853d08ffd3fad460b03562915768a8eb77f7e6182aa56389","last_reissued_at":"2026-05-18T01:46:40.169329Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:40.169329Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.0057","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RiUJ0CfrtUmY2c0m9q6pF4FLDUBA5x3bf0pqthHFh5e15coW/fbPpgvf676Ws7CQQogJAUN0lh5KUIuNqJieDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T06:18:32.823412Z"},"content_sha256":"1b04481918626966b9b5c9507bd4f143285b5f4be602373cb1445e1a4fd3d705","schema_version":"1.0","event_id":"sha256:1b04481918626966b9b5c9507bd4f143285b5f4be602373cb1445e1a4fd3d705"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:PDVROPPD2CJVVBJ5BD75H6WUMC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectroscopy of z ~ 7 candidate galaxies: Using Lyman-alpha to constrain the neutral fraction of hydrogen in the high-redshift universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Andrew J. Bunker, Elizabeth R. Stanway, Holly Elbert, Joseph Caruana, Matt J. Jarvis, Silvio Lorenzoni, Stephen M. Wilkins","submitted_at":"2013-10-31T22:40:47Z","abstract_excerpt":"Following our previous spectroscopic observations of $z>7$ galaxies with Gemini/GNIRS and VLT/XSHOOTER, which targeted a total of 8 objects, we present here our results from a deeper and larger VLT/FORS2 spectroscopic sample of Wide Field Camera 3 selected $z>7$ candidate galaxies. With our FORS2 setup we cover the 737-1070nm wavelength range, enabling a search for Lyman-$\\alpha$ in the redshift range spanning 5.06 - 7.80. We target 22 $z$-band dropouts and find no evidence of Lyman-$\\alpha$ emission, with the exception of a tentative detection ($<5\\sigma$, which is our adopted criterion for a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0057","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BohV+szOyrSqr8rm9k2tEC0DbmScJ5INa+pKQwQ3rF+E47ei/wEhHysRcAfmbk2ibGBf+7ETUezGrzJ6c3/LBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T06:18:32.823768Z"},"content_sha256":"9e9d7c1b4097f801ef7630a0d0779e45a273039eb3eb9385e0956efb541b2255","schema_version":"1.0","event_id":"sha256:9e9d7c1b4097f801ef7630a0d0779e45a273039eb3eb9385e0956efb541b2255"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/bundle.json","state_url":"https://pith.science/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-28T06:18:32Z","links":{"resolver":"https://pith.science/pith/PDVROPPD2CJVVBJ5BD75H6WUMC","bundle":"https://pith.science/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/bundle.json","state":"https://pith.science/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PDVROPPD2CJVVBJ5BD75H6WUMC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:PDVROPPD2CJVVBJ5BD75H6WUMC","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"f338120a5d59737ff61ea83ace0c1e2cebbcc8d754aa29387e9a87c6b34dbf04","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-31T22:40:47Z","title_canon_sha256":"6d8f571a4a876406214e2b98cf2a6877d5f317441c4938a4351041689b1a5a4a"},"schema_version":"1.0","source":{"id":"1311.0057","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.0057","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"arxiv_version","alias_value":"1311.0057v2","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.0057","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"pith_short_12","alias_value":"PDVROPPD2CJV","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"PDVROPPD2CJVVBJ5","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"PDVROPPD","created_at":"2026-05-18T12:27:54Z"}],"graph_snapshots":[{"event_id":"sha256:9e9d7c1b4097f801ef7630a0d0779e45a273039eb3eb9385e0956efb541b2255","target":"graph","created_at":"2026-05-18T01:46:40Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Following our previous spectroscopic observations of $z>7$ galaxies with Gemini/GNIRS and VLT/XSHOOTER, which targeted a total of 8 objects, we present here our results from a deeper and larger VLT/FORS2 spectroscopic sample of Wide Field Camera 3 selected $z>7$ candidate galaxies. With our FORS2 setup we cover the 737-1070nm wavelength range, enabling a search for Lyman-$\\alpha$ in the redshift range spanning 5.06 - 7.80. We target 22 $z$-band dropouts and find no evidence of Lyman-$\\alpha$ emission, with the exception of a tentative detection ($<5\\sigma$, which is our adopted criterion for a","authors_text":"Andrew J. Bunker, Elizabeth R. Stanway, Holly Elbert, Joseph Caruana, Matt J. Jarvis, Silvio Lorenzoni, Stephen M. Wilkins","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-31T22:40:47Z","title":"Spectroscopy of z ~ 7 candidate galaxies: Using Lyman-alpha to constrain the neutral fraction of hydrogen in the high-redshift universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0057","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1b04481918626966b9b5c9507bd4f143285b5f4be602373cb1445e1a4fd3d705","target":"record","created_at":"2026-05-18T01:46:40Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"f338120a5d59737ff61ea83ace0c1e2cebbcc8d754aa29387e9a87c6b34dbf04","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-10-31T22:40:47Z","title_canon_sha256":"6d8f571a4a876406214e2b98cf2a6877d5f317441c4938a4351041689b1a5a4a"},"schema_version":"1.0","source":{"id":"1311.0057","kind":"arxiv","version":2}},"canonical_sha256":"78eb173de3d0935a853d08ffd3fad460b03562915768a8eb77f7e6182aa56389","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78eb173de3d0935a853d08ffd3fad460b03562915768a8eb77f7e6182aa56389","first_computed_at":"2026-05-18T01:46:40.169329Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:40.169329Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LI+nKdy9Ng5+YzSxrxpB91OBLNTwp+PaFoKB+X4Nc0KGmGUszyuzwg2NHsk/PIginP9Xz8XsRHGH1l8CpbBxDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:40.169889Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.0057","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1b04481918626966b9b5c9507bd4f143285b5f4be602373cb1445e1a4fd3d705","sha256:9e9d7c1b4097f801ef7630a0d0779e45a273039eb3eb9385e0956efb541b2255"],"state_sha256":"52b0495fab10454c6691a0da6b23c9c81cbb27e21350e78a159fc35ef3b21bb0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D7Y81IoLrXuRfFm7KWALuMqZHG1ZGXzHAWl/e6IMQz8TtpADIiZeO3lTQQqESuIGat/Crd2GLlJgYHIRA47uDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T06:18:32.825771Z","bundle_sha256":"5d394213e5695b7bdf9d9f45d7a7d666ef23b0594488ef3eb4c06a042403c72a"}}