{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:YP76LUEQ5ABMI37TC3RIYXYYUN","short_pith_number":"pith:YP76LUEQ","canonical_record":{"source":{"id":"1209.3011","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-09-13T19:57:05Z","cross_cats_sorted":[],"title_canon_sha256":"d17391708cdc78998bc69b5b42b11d29273a6df601826f00316d35563189c80d","abstract_canon_sha256":"8caa8dbfe095051e9d2cf92b8eb027156e76a339ee3984d45c83d8be68734136"},"schema_version":"1.0"},"canonical_sha256":"c3ffe5d090e802c46ff316e28c5f18a35ab5c892ec2018e3f7268de75b12ba7c","source":{"kind":"arxiv","id":"1209.3011","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3011","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3011v1","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3011","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"pith_short_12","alias_value":"YP76LUEQ5ABM","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"YP76LUEQ5ABMI37T","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"YP76LUEQ","created_at":"2026-05-18T12:27:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:YP76LUEQ5ABMI37TC3RIYXYYUN","target":"record","payload":{"canonical_record":{"source":{"id":"1209.3011","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-09-13T19:57:05Z","cross_cats_sorted":[],"title_canon_sha256":"d17391708cdc78998bc69b5b42b11d29273a6df601826f00316d35563189c80d","abstract_canon_sha256":"8caa8dbfe095051e9d2cf92b8eb027156e76a339ee3984d45c83d8be68734136"},"schema_version":"1.0"},"canonical_sha256":"c3ffe5d090e802c46ff316e28c5f18a35ab5c892ec2018e3f7268de75b12ba7c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:29.325079Z","signature_b64":"ooj4mSevRlgZ6o5yS1t4JXji+tV62jATK0Dg7UJxKQkdvRewJhiYzxj0UpCuVvlNAIYw2Nq/Ep/mXO0nACGwDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c3ffe5d090e802c46ff316e28c5f18a35ab5c892ec2018e3f7268de75b12ba7c","last_reissued_at":"2026-05-18T01:54:29.324629Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:29.324629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.3011","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":"2026-05-18T01:54:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N8gmkUa8TdVBWrm7GW+ty5IAoX5MoEm26NYCw/fdhPoO9P7gRP7owr4b/W0UeCLbitlcHoywrhj+GmuYuSqSAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T12:49:31.246524Z"},"content_sha256":"c465d640aaa7aef94e7bec07840033d857dd567b6f9c332ae5a78fcb673326d4","schema_version":"1.0","event_id":"sha256:c465d640aaa7aef94e7bec07840033d857dd567b6f9c332ae5a78fcb673326d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:YP76LUEQ5ABMI37TC3RIYXYYUN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The merging dwarf galaxy UM 448: chemodynamics of the ionized gas from VLT integral field spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"B. L. James, J. R. Walsh, M. J. Barlow, M. S. Westmoquette, Y. G. Tsamis","submitted_at":"2012-09-13T19:57:05Z","abstract_excerpt":"Using VLT/FLAMES optical IFU observations, we present a detailed study of UM 448, a nearby Blue Compact Galaxy (BCG) previously reported to have an anomalously high N/O abundance ratio. NTT/SuSI2 images reveal a morphology suggestive of a merger of two systems of contrasting colour, whilst our H-alpha emission maps resolve UM 448 into three separate regions that do not coincide with the stellar continuum peaks. UM 448 exhibits complex emission line profiles, with lines consisting of a narrow, central component, an underlying broad component and a third, narrow blue-shifted component. Radial ve"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3011","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":"2026-05-18T01:54:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qwRFwzvg6BZ5Q7QP7CqrmQM09fTO0YfJdhRNKWKyw6F/dHlkyecEDpNcKGBECMnol8EidY68HdiFaBHZRNdGBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T12:49:31.247226Z"},"content_sha256":"b7a15ac9d0c5886f4b2b8ce2cecb96f74db962a07aef6129912d6836f9aa5fac","schema_version":"1.0","event_id":"sha256:b7a15ac9d0c5886f4b2b8ce2cecb96f74db962a07aef6129912d6836f9aa5fac"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/bundle.json","state_url":"https://pith.science/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/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":"2026-06-06T12:49:31Z","links":{"resolver":"https://pith.science/pith/YP76LUEQ5ABMI37TC3RIYXYYUN","bundle":"https://pith.science/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/bundle.json","state":"https://pith.science/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YP76LUEQ5ABMI37TC3RIYXYYUN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:YP76LUEQ5ABMI37TC3RIYXYYUN","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":"8caa8dbfe095051e9d2cf92b8eb027156e76a339ee3984d45c83d8be68734136","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-09-13T19:57:05Z","title_canon_sha256":"d17391708cdc78998bc69b5b42b11d29273a6df601826f00316d35563189c80d"},"schema_version":"1.0","source":{"id":"1209.3011","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3011","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3011v1","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3011","created_at":"2026-05-18T01:54:29Z"},{"alias_kind":"pith_short_12","alias_value":"YP76LUEQ5ABM","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"YP76LUEQ5ABMI37T","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"YP76LUEQ","created_at":"2026-05-18T12:27:27Z"}],"graph_snapshots":[{"event_id":"sha256:b7a15ac9d0c5886f4b2b8ce2cecb96f74db962a07aef6129912d6836f9aa5fac","target":"graph","created_at":"2026-05-18T01:54:29Z","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":"Using VLT/FLAMES optical IFU observations, we present a detailed study of UM 448, a nearby Blue Compact Galaxy (BCG) previously reported to have an anomalously high N/O abundance ratio. NTT/SuSI2 images reveal a morphology suggestive of a merger of two systems of contrasting colour, whilst our H-alpha emission maps resolve UM 448 into three separate regions that do not coincide with the stellar continuum peaks. UM 448 exhibits complex emission line profiles, with lines consisting of a narrow, central component, an underlying broad component and a third, narrow blue-shifted component. Radial ve","authors_text":"B. L. James, J. R. Walsh, M. J. Barlow, M. S. Westmoquette, Y. G. Tsamis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-09-13T19:57:05Z","title":"The merging dwarf galaxy UM 448: chemodynamics of the ionized gas from VLT integral field spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3011","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:c465d640aaa7aef94e7bec07840033d857dd567b6f9c332ae5a78fcb673326d4","target":"record","created_at":"2026-05-18T01:54:29Z","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":"8caa8dbfe095051e9d2cf92b8eb027156e76a339ee3984d45c83d8be68734136","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-09-13T19:57:05Z","title_canon_sha256":"d17391708cdc78998bc69b5b42b11d29273a6df601826f00316d35563189c80d"},"schema_version":"1.0","source":{"id":"1209.3011","kind":"arxiv","version":1}},"canonical_sha256":"c3ffe5d090e802c46ff316e28c5f18a35ab5c892ec2018e3f7268de75b12ba7c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c3ffe5d090e802c46ff316e28c5f18a35ab5c892ec2018e3f7268de75b12ba7c","first_computed_at":"2026-05-18T01:54:29.324629Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:29.324629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ooj4mSevRlgZ6o5yS1t4JXji+tV62jATK0Dg7UJxKQkdvRewJhiYzxj0UpCuVvlNAIYw2Nq/Ep/mXO0nACGwDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:29.325079Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.3011","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c465d640aaa7aef94e7bec07840033d857dd567b6f9c332ae5a78fcb673326d4","sha256:b7a15ac9d0c5886f4b2b8ce2cecb96f74db962a07aef6129912d6836f9aa5fac"],"state_sha256":"49631cd1715d2af6ffdd94775e3dfea99830a2f2daaa9249094d42d226f278a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eRQFJByJ9bo9qL7Q91UDbsNB0x9D/HtDTpSk/fM8q4c5AcVsxKJzRq/cG+5jEyQNTGv0eGQ+50qVqW7PS+OdAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T12:49:31.251156Z","bundle_sha256":"8268740bdcd89185f7ce908ef18c04662990d069743cc9d0f3d7e1de84b415ba"}}