{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:I5XHUCUAXQZW5DUWZLVZXPNWKF","short_pith_number":"pith:I5XHUCUA","canonical_record":{"source":{"id":"0909.2255","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T19:58:03Z","cross_cats_sorted":[],"title_canon_sha256":"911eb9418c646c523430e603462011d5e59885422904a3c3d64f51df19f75c65","abstract_canon_sha256":"63bdb5adfaa6cd3942d2f984c7d9d2dd9d74630e1e727ed977b22676ae01399c"},"schema_version":"1.0"},"canonical_sha256":"476e7a0a80bc336e8e96caeb9bbdb6515666241c7a49ccaf5749cfa0c463ae7b","source":{"kind":"arxiv","id":"0909.2255","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2255","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2255v3","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2255","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"pith_short_12","alias_value":"I5XHUCUAXQZW","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"I5XHUCUAXQZW5DUW","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"I5XHUCUA","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:I5XHUCUAXQZW5DUWZLVZXPNWKF","target":"record","payload":{"canonical_record":{"source":{"id":"0909.2255","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T19:58:03Z","cross_cats_sorted":[],"title_canon_sha256":"911eb9418c646c523430e603462011d5e59885422904a3c3d64f51df19f75c65","abstract_canon_sha256":"63bdb5adfaa6cd3942d2f984c7d9d2dd9d74630e1e727ed977b22676ae01399c"},"schema_version":"1.0"},"canonical_sha256":"476e7a0a80bc336e8e96caeb9bbdb6515666241c7a49ccaf5749cfa0c463ae7b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:48.770927Z","signature_b64":"QIactw6m5ge3JSXn7Q5XurzDEJdIFDjcTFQz1Zb23SZrsWG2AhGoiaHidIu4TqPB+MbBsMge/u4Ecjqof/0vCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"476e7a0a80bc336e8e96caeb9bbdb6515666241c7a49ccaf5749cfa0c463ae7b","last_reissued_at":"2026-05-18T02:11:48.770152Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:48.770152Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.2255","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:11:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zei48QwFi4DtEQS0Os96K/trWMC8IB0T8s4ISrJPWosZHjPFCEiOy2GppmBb0TnTKLyTI7vknwmJokkrhZC6AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:16:24.435971Z"},"content_sha256":"40b9356b7ffddec5762342ab651dd11465644777e320bfc30888f4d9dd685c10","schema_version":"1.0","event_id":"sha256:40b9356b7ffddec5762342ab651dd11465644777e320bfc30888f4d9dd685c10"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:I5XHUCUAXQZW5DUWZLVZXPNWKF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Contribution of High Redshift Galaxies to Cosmic Reionization: New Results from Deep WFC3 Imaging of the Hubble Ultra Deep Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) Caltech Astrophysics, (3) Institute of Astronomy, (4) NRAO, Andrew Bunker (1), Cambridge, Charlottesville (5) University of Hertfordshire), Daniel Stark (3), Kuenley Chiu (2), Mark Lacy (4), Matt Jarvis (5), Richard Ellis (2), Samantha Hickey (5) ((1) Physics Department, Silvio Lorenzoni (1), Stephen Wilkins (1), University of Oxford","submitted_at":"2009-09-14T19:58:03Z","abstract_excerpt":"We have searched for star-forming galaxies at z~7 by applying the Lyman-break technique to newly-released 1.1micron Y-band images from WFC3 on HST. By comparing these images of the Hubble Ultra Deep Field with the ACS z'-band (0.85micron), we identify objects with red colours, (z'-Y)_AB>1.3), consistent with the Ly-alpha forest absorption at z~6.7-8.8. We identify 12 of these z'-drops down to a limiting magnitude Y_AB<28.5 (equivalent to a star formation rate of 1.3M_sun/yr at z=7.1), which are undetected in the other ACS filters. We use the WFC3 J-band image to eliminate contaminant low mass "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2255","kind":"arxiv","version":3},"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":"2026-05-18T02:11:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jbw5JLup1pC1upH74gRzmL2LcAz8LY5t0vAprue/B8wDZH4rAvqtymK/MyPZ5zzpRa3KWks869/buHYhMIwqBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:16:24.436381Z"},"content_sha256":"f03a084f6f366f366530c3fd3989b2eaf0e1c6ab67c1155102162cd9a852c8f8","schema_version":"1.0","event_id":"sha256:f03a084f6f366f366530c3fd3989b2eaf0e1c6ab67c1155102162cd9a852c8f8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/bundle.json","state_url":"https://pith.science/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/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":"2026-06-01T01:16:24Z","links":{"resolver":"https://pith.science/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF","bundle":"https://pith.science/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/bundle.json","state":"https://pith.science/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I5XHUCUAXQZW5DUWZLVZXPNWKF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:I5XHUCUAXQZW5DUWZLVZXPNWKF","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":"63bdb5adfaa6cd3942d2f984c7d9d2dd9d74630e1e727ed977b22676ae01399c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T19:58:03Z","title_canon_sha256":"911eb9418c646c523430e603462011d5e59885422904a3c3d64f51df19f75c65"},"schema_version":"1.0","source":{"id":"0909.2255","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2255","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2255v3","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2255","created_at":"2026-05-18T02:11:48Z"},{"alias_kind":"pith_short_12","alias_value":"I5XHUCUAXQZW","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"I5XHUCUAXQZW5DUW","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"I5XHUCUA","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:f03a084f6f366f366530c3fd3989b2eaf0e1c6ab67c1155102162cd9a852c8f8","target":"graph","created_at":"2026-05-18T02:11:48Z","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":"We have searched for star-forming galaxies at z~7 by applying the Lyman-break technique to newly-released 1.1micron Y-band images from WFC3 on HST. By comparing these images of the Hubble Ultra Deep Field with the ACS z'-band (0.85micron), we identify objects with red colours, (z'-Y)_AB>1.3), consistent with the Ly-alpha forest absorption at z~6.7-8.8. We identify 12 of these z'-drops down to a limiting magnitude Y_AB<28.5 (equivalent to a star formation rate of 1.3M_sun/yr at z=7.1), which are undetected in the other ACS filters. We use the WFC3 J-band image to eliminate contaminant low mass ","authors_text":"(2) Caltech Astrophysics, (3) Institute of Astronomy, (4) NRAO, Andrew Bunker (1), Cambridge, Charlottesville (5) University of Hertfordshire), Daniel Stark (3), Kuenley Chiu (2), Mark Lacy (4), Matt Jarvis (5), Richard Ellis (2), Samantha Hickey (5) ((1) Physics Department, Silvio Lorenzoni (1), Stephen Wilkins (1), University of Oxford","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T19:58:03Z","title":"The Contribution of High Redshift Galaxies to Cosmic Reionization: New Results from Deep WFC3 Imaging of the Hubble Ultra Deep Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2255","kind":"arxiv","version":3},"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":"sha256:40b9356b7ffddec5762342ab651dd11465644777e320bfc30888f4d9dd685c10","target":"record","created_at":"2026-05-18T02:11:48Z","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":"63bdb5adfaa6cd3942d2f984c7d9d2dd9d74630e1e727ed977b22676ae01399c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T19:58:03Z","title_canon_sha256":"911eb9418c646c523430e603462011d5e59885422904a3c3d64f51df19f75c65"},"schema_version":"1.0","source":{"id":"0909.2255","kind":"arxiv","version":3}},"canonical_sha256":"476e7a0a80bc336e8e96caeb9bbdb6515666241c7a49ccaf5749cfa0c463ae7b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"476e7a0a80bc336e8e96caeb9bbdb6515666241c7a49ccaf5749cfa0c463ae7b","first_computed_at":"2026-05-18T02:11:48.770152Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:48.770152Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QIactw6m5ge3JSXn7Q5XurzDEJdIFDjcTFQz1Zb23SZrsWG2AhGoiaHidIu4TqPB+MbBsMge/u4Ecjqof/0vCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:48.770927Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2255","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:40b9356b7ffddec5762342ab651dd11465644777e320bfc30888f4d9dd685c10","sha256:f03a084f6f366f366530c3fd3989b2eaf0e1c6ab67c1155102162cd9a852c8f8"],"state_sha256":"af96f2d2d4e6fb08130a9028c0277f00bb87cb98b1a5cfeb4836711ea99d5179"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rZ3lBSWuq0WnRo9CcY2kr1QBpCVVSKzl1TPOniAmnHVNvHqBKzRY2gle8BKVHkdAj28hQw37cNsfpfFNc/IfCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T01:16:24.438895Z","bundle_sha256":"d5a2a286ea774c2b5b25d0151651a3fe37d91646dc5bb55847c5fbf726e129c3"}}