{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5KK4GP4CTACCB2GJLOXFRFAHA4","short_pith_number":"pith:5KK4GP4C","canonical_record":{"source":{"id":"1604.08555","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-28T18:50:52Z","cross_cats_sorted":[],"title_canon_sha256":"0f2bfbbf13f35ef891588f7f1774954f2a90c15d8c1ef34d8b44dad127ade92e","abstract_canon_sha256":"2b6bd3ec05731d0763310e8e9d37d1aa992a1a76db971dcf9194805fd3855e64"},"schema_version":"1.0"},"canonical_sha256":"ea95c33f82980420e8c95bae589407071a655e6db28262419e57fbb256ce4f37","source":{"kind":"arxiv","id":"1604.08555","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08555","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08555v1","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08555","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"pith_short_12","alias_value":"5KK4GP4CTACC","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5KK4GP4CTACCB2GJ","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5KK4GP4C","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5KK4GP4CTACCB2GJLOXFRFAHA4","target":"record","payload":{"canonical_record":{"source":{"id":"1604.08555","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-28T18:50:52Z","cross_cats_sorted":[],"title_canon_sha256":"0f2bfbbf13f35ef891588f7f1774954f2a90c15d8c1ef34d8b44dad127ade92e","abstract_canon_sha256":"2b6bd3ec05731d0763310e8e9d37d1aa992a1a76db971dcf9194805fd3855e64"},"schema_version":"1.0"},"canonical_sha256":"ea95c33f82980420e8c95bae589407071a655e6db28262419e57fbb256ce4f37","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:48.600030Z","signature_b64":"QbwcAHBUVqZ05WEzmgLxg0bzpXZfD4KjH03KFE/CxZN1le4eG2iaWHCHDlMjMDJ9P00dUhXpqSLCub7pmC75Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ea95c33f82980420e8c95bae589407071a655e6db28262419e57fbb256ce4f37","last_reissued_at":"2026-05-18T01:15:48.599563Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:48.599563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.08555","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:15:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9j3ttjslEsdFGfubZyXMouH9UUHEajCFpqGaiWChcYm5bIfxgsQqS/GEXp/63E5mDhnqbrbTwS0UxK1K2S2RDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T19:24:24.188705Z"},"content_sha256":"d7845c89b337a30c6aff5922d2fcf10cf5a78d77b6a836993d5f5576801c9896","schema_version":"1.0","event_id":"sha256:d7845c89b337a30c6aff5922d2fcf10cf5a78d77b6a836993d5f5576801c9896"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5KK4GP4CTACCB2GJLOXFRFAHA4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spatially resolved integral field spectroscopy of the ionized gas in IZw18","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C. Kehrig, D. Kunth, E. Perez-Montero, F. Durret, J. Brinchmann, J.D. Hernandez-Fernandez, J. Iglesias-Paramo, J.M. Vilchez, S. Duarte Puertas","submitted_at":"2016-04-28T18:50:52Z","abstract_excerpt":"We present a detailed 2D study of the ionized ISM of IZw18 using new PMAS-IFU optical observations. IZw18 is a high-ionization galaxy which is among the most metal-poor starbursts in the local Universe. This makes IZw18 a local benchmark for understanding the properties most closely resembling those prevailing at distant starbursts. Our IFU-aperture (~ 1.4 kpc x 1.4 kpc) samples the entire IZw18 main body and an extended region of its ionized gas. Maps of relevant emission lines and emission line ratios show that higher-excitation gas is preferentially located close to the NW knot and thereabo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08555","kind":"arxiv","version":1},"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":"2026-05-18T01:15:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c3695ShXkZ7iZ65JBtwsX/dm3wSpg9lDqPMIIbS5J0qLL2WDIoUaWB7sKNPftRB/jL0gE5mn2DRC3jTWkvd2Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T19:24:24.189048Z"},"content_sha256":"255553f5a9fc5ce95dff80c4951f74b34a85a6b52cb652dcb2200b38bc16eed3","schema_version":"1.0","event_id":"sha256:255553f5a9fc5ce95dff80c4951f74b34a85a6b52cb652dcb2200b38bc16eed3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/bundle.json","state_url":"https://pith.science/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/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":"2026-06-02T19:24:24Z","links":{"resolver":"https://pith.science/pith/5KK4GP4CTACCB2GJLOXFRFAHA4","bundle":"https://pith.science/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/bundle.json","state":"https://pith.science/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5KK4GP4CTACCB2GJLOXFRFAHA4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5KK4GP4CTACCB2GJLOXFRFAHA4","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":"2b6bd3ec05731d0763310e8e9d37d1aa992a1a76db971dcf9194805fd3855e64","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-28T18:50:52Z","title_canon_sha256":"0f2bfbbf13f35ef891588f7f1774954f2a90c15d8c1ef34d8b44dad127ade92e"},"schema_version":"1.0","source":{"id":"1604.08555","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08555","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08555v1","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08555","created_at":"2026-05-18T01:15:48Z"},{"alias_kind":"pith_short_12","alias_value":"5KK4GP4CTACC","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5KK4GP4CTACCB2GJ","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5KK4GP4C","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:255553f5a9fc5ce95dff80c4951f74b34a85a6b52cb652dcb2200b38bc16eed3","target":"graph","created_at":"2026-05-18T01:15:48Z","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 present a detailed 2D study of the ionized ISM of IZw18 using new PMAS-IFU optical observations. IZw18 is a high-ionization galaxy which is among the most metal-poor starbursts in the local Universe. This makes IZw18 a local benchmark for understanding the properties most closely resembling those prevailing at distant starbursts. Our IFU-aperture (~ 1.4 kpc x 1.4 kpc) samples the entire IZw18 main body and an extended region of its ionized gas. Maps of relevant emission lines and emission line ratios show that higher-excitation gas is preferentially located close to the NW knot and thereabo","authors_text":"C. Kehrig, D. Kunth, E. Perez-Montero, F. Durret, J. Brinchmann, J.D. Hernandez-Fernandez, J. Iglesias-Paramo, J.M. Vilchez, S. Duarte Puertas","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-28T18:50:52Z","title":"Spatially resolved integral field spectroscopy of the ionized gas in IZw18"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08555","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:d7845c89b337a30c6aff5922d2fcf10cf5a78d77b6a836993d5f5576801c9896","target":"record","created_at":"2026-05-18T01:15:48Z","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":"2b6bd3ec05731d0763310e8e9d37d1aa992a1a76db971dcf9194805fd3855e64","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-04-28T18:50:52Z","title_canon_sha256":"0f2bfbbf13f35ef891588f7f1774954f2a90c15d8c1ef34d8b44dad127ade92e"},"schema_version":"1.0","source":{"id":"1604.08555","kind":"arxiv","version":1}},"canonical_sha256":"ea95c33f82980420e8c95bae589407071a655e6db28262419e57fbb256ce4f37","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ea95c33f82980420e8c95bae589407071a655e6db28262419e57fbb256ce4f37","first_computed_at":"2026-05-18T01:15:48.599563Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:48.599563Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QbwcAHBUVqZ05WEzmgLxg0bzpXZfD4KjH03KFE/CxZN1le4eG2iaWHCHDlMjMDJ9P00dUhXpqSLCub7pmC75Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:48.600030Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.08555","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d7845c89b337a30c6aff5922d2fcf10cf5a78d77b6a836993d5f5576801c9896","sha256:255553f5a9fc5ce95dff80c4951f74b34a85a6b52cb652dcb2200b38bc16eed3"],"state_sha256":"b35fbb7cbc59b9a393d673ef403e672dbe82226325c54c94ae4578fbb272cec9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"spf4G1GrTVRnniFRC6Zp6FoZbNEr+1kfk51ogqKrgKB8fJy3sOwNiK0kAcd+y/lR3l0ocnSqPMuzPWL2kvN/AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T19:24:24.191005Z","bundle_sha256":"0e37b36d3a441f42e7cd993b3a5a726f398f7ba173f9f3b413152bca0f01467a"}}