{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QV24XYAWQBBEGH3XJB76CPKSU5","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":"242179ba0f5865d0600ce826c99397474c0619293ce37b06c75fc267f91ab067","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-07-28T20:00:39Z","title_canon_sha256":"cedea136279b0b28ea66070f16de0144e0f14de9fe862bc884d0197f71a56e00"},"schema_version":"1.0","source":{"id":"1507.07932","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07932","created_at":"2026-05-18T01:29:45Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07932v1","created_at":"2026-05-18T01:29:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07932","created_at":"2026-05-18T01:29:45Z"},{"alias_kind":"pith_short_12","alias_value":"QV24XYAWQBBE","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"QV24XYAWQBBEGH3X","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"QV24XYAW","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:001107e1f6a924caaf2f772f7d77fe2ab81c2caa8bde3daf9a38f2b3051f4249","target":"graph","created_at":"2026-05-18T01:29:45Z","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 investigate the change in ionizing photons in galaxies between 0.2<z<0.6 using the F2 field of the SHELS complete galaxy redshift survey. We show, for the first time, that while the [OIII]/Hb and [OIII]/[OII] ratios rise, the [NII]/H-alpha and [SII]/H-alpha ratios fall significantly over the 0.2<z<0.35 redshift range for stellar masses between 9.2<log(M/Msun)<10.6. The [OIII]/H-beta and [OIII]/[OII] ratios continue to rise across the full 0.2<z<0.6 redshift range for stellar masses between 9.8<log(M/Msun)<10.0. We conclusively rule out AGN contamination, a changing ISM pressure, and a chang","authors_text":"Dan Fabricant, H. Jabran Zahid, Ho Seong Hwang, Lisa J. Kewley, Margaret J. Geller, Michael A. Dopita","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-07-28T20:00:39Z","title":"A rise in the ionizing photons in star-forming galaxies over the past 5 billion years"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07932","kind":"arxiv","version":1},"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:fafc3de89e0d5f2b0663c1ad474214ac9ed3bf49a4847494ccc8eb234c0f09c3","target":"record","created_at":"2026-05-18T01:29:45Z","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":"242179ba0f5865d0600ce826c99397474c0619293ce37b06c75fc267f91ab067","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-07-28T20:00:39Z","title_canon_sha256":"cedea136279b0b28ea66070f16de0144e0f14de9fe862bc884d0197f71a56e00"},"schema_version":"1.0","source":{"id":"1507.07932","kind":"arxiv","version":1}},"canonical_sha256":"8575cbe0168042431f77487fe13d52a747f29294a3204e5cc88c7915e90cba7a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8575cbe0168042431f77487fe13d52a747f29294a3204e5cc88c7915e90cba7a","first_computed_at":"2026-05-18T01:29:45.229269Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:29:45.229269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gdqsUaOzlX/bXzPcUvdBqmLJDD2tdOVHYHbDh1Zu1jj+Lb4S4SeVesd01/Ge8lF48zRchH2ch68M+dlfLlGSCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:29:45.229751Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.07932","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fafc3de89e0d5f2b0663c1ad474214ac9ed3bf49a4847494ccc8eb234c0f09c3","sha256:001107e1f6a924caaf2f772f7d77fe2ab81c2caa8bde3daf9a38f2b3051f4249"],"state_sha256":"c0d16d8d80ba0b6c7890851c179ed3f202dddca319304721789db963e03eb0f4"}