{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:3G2KMS2K7ROLHRZWGBP7ZWMDBG","short_pith_number":"pith:3G2KMS2K","schema_version":"1.0","canonical_sha256":"d9b4a64b4afc5cb3c736305ffcd983098acc9b1198be7d5f486fb343396c36f0","source":{"kind":"arxiv","id":"0909.1803","version":3},"attestation_state":"computed","paper":{"title":"Discovery of z~8 Galaxies in the HUDF from ultra-deep WFC3/IR Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"D. Magee (UCSC), G.D. Illingworth (UCSC), I. Labbe (OCIW), M. Carollo (ETH Zurich), M. Franx (Leiden), M. Stiavelli (STScI), M. Trenti (Colorado), P.A. Oesch (ETH Zurich), P. van Dokkum (Yale), R.J. Bouwens (UCSC/Leiden), V. Gonzalez (UCSC)","submitted_at":"2009-09-10T19:51:18Z","abstract_excerpt":"We utilize the newly-acquired, ultra-deep WFC3/IR observations over the HUDF to search for star-forming galaxies at z~8-8.5, only 600 million years from recombination, using a Y_{105}-dropout selection. The new 4.7 arcmin**2 WFC3/IR observations reach to ~28.8 AB mag (5 sigma) in the Y_{105}J_{125}H_{160} bands. These remarkable data reach ~1.5 AB mag deeper than the previous data over the HUDF, and now are an excellent match to the HUDF optical ACS data. For our search criteria, we use a two-color Lyman-Break selection technique to identify z~8-8.5 Y_{105}-dropouts. We find 5 likely z~8-8.5 c"},"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":"0909.1803","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-10T19:51:18Z","cross_cats_sorted":[],"title_canon_sha256":"4479d1a05232712c6877a0af1a65363f8e843316a0d24d2c7a998126eff98bf6","abstract_canon_sha256":"a33a8ffb4810c372c1e3487b3b14e633354c310501be9bdbd6dce45873ab9f49"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:57.864612Z","signature_b64":"CfK95NmAPcywJYdakuMcwDbB8tCE5Mkg3dA+jnXcxrBAmR/Y56PGcJR0D5Ue7D7dABgjzGKAj9IKRdPCeZfcAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d9b4a64b4afc5cb3c736305ffcd983098acc9b1198be7d5f486fb343396c36f0","last_reissued_at":"2026-05-18T02:11:57.863865Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:57.863865Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of z~8 Galaxies in the HUDF from ultra-deep WFC3/IR Observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"D. Magee (UCSC), G.D. Illingworth (UCSC), I. Labbe (OCIW), M. Carollo (ETH Zurich), M. Franx (Leiden), M. Stiavelli (STScI), M. Trenti (Colorado), P.A. Oesch (ETH Zurich), P. van Dokkum (Yale), R.J. Bouwens (UCSC/Leiden), V. Gonzalez (UCSC)","submitted_at":"2009-09-10T19:51:18Z","abstract_excerpt":"We utilize the newly-acquired, ultra-deep WFC3/IR observations over the HUDF to search for star-forming galaxies at z~8-8.5, only 600 million years from recombination, using a Y_{105}-dropout selection. The new 4.7 arcmin**2 WFC3/IR observations reach to ~28.8 AB mag (5 sigma) in the Y_{105}J_{125}H_{160} bands. These remarkable data reach ~1.5 AB mag deeper than the previous data over the HUDF, and now are an excellent match to the HUDF optical ACS data. For our search criteria, we use a two-color Lyman-Break selection technique to identify z~8-8.5 Y_{105}-dropouts. We find 5 likely z~8-8.5 c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.1803","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0909.1803","created_at":"2026-05-18T02:11:57.863989+00:00"},{"alias_kind":"arxiv_version","alias_value":"0909.1803v3","created_at":"2026-05-18T02:11:57.863989+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.1803","created_at":"2026-05-18T02:11:57.863989+00:00"},{"alias_kind":"pith_short_12","alias_value":"3G2KMS2K7ROL","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_16","alias_value":"3G2KMS2K7ROLHRZW","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_8","alias_value":"3G2KMS2K","created_at":"2026-05-18T12:25:58.018023+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":2,"sample":[{"citing_arxiv_id":"2606.02738","citing_title":"Signature of Bursty Star Formation in the High-Redshift Galaxies Detected with JWST","ref_index":25,"is_internal_anchor":true},{"citing_arxiv_id":"2605.13472","citing_title":"First Light And Reionization Epoch Simulations (FLARES) XXI: The UV Indices of Galaxies in the Early Universe","ref_index":262,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG","json":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG.json","graph_json":"https://pith.science/api/pith-number/3G2KMS2K7ROLHRZWGBP7ZWMDBG/graph.json","events_json":"https://pith.science/api/pith-number/3G2KMS2K7ROLHRZWGBP7ZWMDBG/events.json","paper":"https://pith.science/paper/3G2KMS2K"},"agent_actions":{"view_html":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG","download_json":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG.json","view_paper":"https://pith.science/paper/3G2KMS2K","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0909.1803&json=true","fetch_graph":"https://pith.science/api/pith-number/3G2KMS2K7ROLHRZWGBP7ZWMDBG/graph.json","fetch_events":"https://pith.science/api/pith-number/3G2KMS2K7ROLHRZWGBP7ZWMDBG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG/action/storage_attestation","attest_author":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG/action/author_attestation","sign_citation":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG/action/citation_signature","submit_replication":"https://pith.science/pith/3G2KMS2K7ROLHRZWGBP7ZWMDBG/action/replication_record"}},"created_at":"2026-05-18T02:11:57.863989+00:00","updated_at":"2026-05-18T02:11:57.863989+00:00"}