{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UW3AXEX2WKPC5WNBSW2P7DPJCB","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":"57f1571a3385997171a11d7302fbef71e2123280ac940b31a99b9057bc11e7a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-15T19:00:01Z","title_canon_sha256":"f9d931354095fc8f77867f136081760b6a874aa2f17bb1224a6734180d694f38"},"schema_version":"1.0","source":{"id":"2102.07779","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.07779","created_at":"2026-07-05T02:43:17Z"},{"alias_kind":"arxiv_version","alias_value":"2102.07779v2","created_at":"2026-07-05T02:43:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.07779","created_at":"2026-07-05T02:43:17Z"},{"alias_kind":"pith_short_12","alias_value":"UW3AXEX2WKPC","created_at":"2026-07-05T02:43:17Z"},{"alias_kind":"pith_short_16","alias_value":"UW3AXEX2WKPC5WNB","created_at":"2026-07-05T02:43:17Z"},{"alias_kind":"pith_short_8","alias_value":"UW3AXEX2","created_at":"2026-07-05T02:43:17Z"}],"graph_snapshots":[{"event_id":"sha256:d154c2831eea9c9f951e95fefe87870b373308a44386174e3ec8abea23ea4508","target":"graph","created_at":"2026-07-05T02:43:17Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2102.07779/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the first results from the X-SHOOTER Lyman-$\\alpha$ survey at $z=2$ (XLS-$z2$). XLS-$z2$ is a deep spectroscopic survey of 35 Lyman-$\\alpha$ emitters (LAEs) utilising $\\approx90$ hours of exposure time with VLT/X-SHOOTER and covers rest-frame Ly$\\alpha$ to H$\\alpha$ emission with R$\\approx4000$. We present the sample selection, the observations and the data reduction. Systemic redshifts are measured from rest-frame optical lines for 33/35 sources. In the stacked spectrum, our LAEs are characterised by an interstellar medium with little dust, a low metallicity and a high ionisation s","authors_text":"Ana Paulino-Afonso, Daniel Schaerer, David Sobral, Gabriele Pezzulli, Huub R\\\"ottgering, Jo\\~ao Calhau, Jorryt Matthee, Matthew Hayes, Max Gronke, Ricardo Amor\\'in, Rohan P. Naidu, S\\'ergio Santos","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-15T19:00:01Z","title":"The X-SHOOTER Lyman-$\\alpha$ survey at z=2 (XLS-z2) I: What makes a galaxy a Lyman-$\\alpha$ emitter?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.07779","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":"sha256:776780d564e05bb700f1f0ceb4ea11a3e9b90d0950733b0a497ce2cf0efa62bb","target":"record","created_at":"2026-07-05T02:43:17Z","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":"57f1571a3385997171a11d7302fbef71e2123280ac940b31a99b9057bc11e7a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-15T19:00:01Z","title_canon_sha256":"f9d931354095fc8f77867f136081760b6a874aa2f17bb1224a6734180d694f38"},"schema_version":"1.0","source":{"id":"2102.07779","kind":"arxiv","version":2}},"canonical_sha256":"a5b60b92fab29e2ed9a195b4ff8de910485d7dfcef1a8f44c5f566e4de94da9b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5b60b92fab29e2ed9a195b4ff8de910485d7dfcef1a8f44c5f566e4de94da9b","first_computed_at":"2026-07-05T02:43:17.740933Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:43:17.740933Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"b/7F095YsM45XHKOzMA2rBTkDUwcHPd8l2P1R0QreiQLQhPMfssY6cVqmBjpgg8hqNtjgEyUP30/vBJhl2VZBg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:43:17.741593Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.07779","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:776780d564e05bb700f1f0ceb4ea11a3e9b90d0950733b0a497ce2cf0efa62bb","sha256:d154c2831eea9c9f951e95fefe87870b373308a44386174e3ec8abea23ea4508"],"state_sha256":"a144d5a317369c38066b4c81fff489beaefdda18b45e58517eee66165cdac5ec"}