{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:QX6L7H2ZC7AGQBLCPSVOCAFIST","short_pith_number":"pith:QX6L7H2Z","canonical_record":{"source":{"id":"1603.04736","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-15T16:10:08Z","cross_cats_sorted":[],"title_canon_sha256":"e6538777039942d89948f85a8b71051575a7a9e509afdd1e315322d5ec046477","abstract_canon_sha256":"64d0b3458a62b6e6cb6ab1dc42a4fb0594d93bafd5c5b800a47b664f3ae06d43"},"schema_version":"1.0"},"canonical_sha256":"85fcbf9f5917c06805627caae100a894f5949b29f3eeb3cb604abde0f62a24c3","source":{"kind":"arxiv","id":"1603.04736","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.04736","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"arxiv_version","alias_value":"1603.04736v1","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.04736","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"pith_short_12","alias_value":"QX6L7H2ZC7AG","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"QX6L7H2ZC7AGQBLC","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"QX6L7H2Z","created_at":"2026-05-18T12:30:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:QX6L7H2ZC7AGQBLCPSVOCAFIST","target":"record","payload":{"canonical_record":{"source":{"id":"1603.04736","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-15T16:10:08Z","cross_cats_sorted":[],"title_canon_sha256":"e6538777039942d89948f85a8b71051575a7a9e509afdd1e315322d5ec046477","abstract_canon_sha256":"64d0b3458a62b6e6cb6ab1dc42a4fb0594d93bafd5c5b800a47b664f3ae06d43"},"schema_version":"1.0"},"canonical_sha256":"85fcbf9f5917c06805627caae100a894f5949b29f3eeb3cb604abde0f62a24c3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:19.024391Z","signature_b64":"qrjihUMGkd3lMRcJkpa+QH/F/TzB/vnYYQsFN55CHqeHbjRL2fbSEUxoYVW4A6/Uhw7ioFEE7EbSYxIduYXHBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85fcbf9f5917c06805627caae100a894f5949b29f3eeb3cb604abde0f62a24c3","last_reissued_at":"2026-05-18T00:49:19.023996Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:19.023996Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1603.04736","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":"2026-05-18T00:49:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wo7lphdOC+Ipu4eIAcBiQpc+Ch0yqrEBhI4/ht4c0tKI632ude+SJx2eotWPn3TqC3iQGRGMUw+ln6PNo2LVBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T04:49:09.436178Z"},"content_sha256":"76769c23700f745a9dad138cd0447d993032bc36f98ae1b55ae85757cb4c0cca","schema_version":"1.0","event_id":"sha256:76769c23700f745a9dad138cd0447d993032bc36f98ae1b55ae85757cb4c0cca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:QX6L7H2ZC7AGQBLCPSVOCAFIST","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dense cloud cores revealed by CO in the low metallicity dwarf galaxy WLM","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Bruce G. Elmegreen, Deidre A. Hunter, Elias Brinks, Juan R. Cortes, Monica Rubio, Phil Cigan","submitted_at":"2016-03-15T16:10:08Z","abstract_excerpt":"Understanding stellar birth requires observations of the clouds in which they form. These clouds are dense and self-gravitating, and in all existing observations, they are molecular with H_2 the dominant species and CO the best available tracer. When the abundances of carbon and oxygen are low compared to hydrogen, and the opacity from dust is also low, as in primeval galaxies and local dwarf irregular galaxies, CO forms slowly and is easily destroyed, so it is difficult for it to accumulate inside dense clouds. Here we report interferometric observations of CO clouds in the local group dwarf "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.04736","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":"2026-05-18T00:49:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7ctiVZUWgC7GkVEaPcHB6C9T36v2SV57MZMonyav/0U/YWxrWVcrVnpBKop/IFkr7BG0HXwVy+TLReG9Hsd8AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T04:49:09.436817Z"},"content_sha256":"6c0f86981e78109a2de485eb6fd24a03eff847d8b386a342a08749cc83dab2aa","schema_version":"1.0","event_id":"sha256:6c0f86981e78109a2de485eb6fd24a03eff847d8b386a342a08749cc83dab2aa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/bundle.json","state_url":"https://pith.science/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/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":"2026-06-10T04:49:09Z","links":{"resolver":"https://pith.science/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST","bundle":"https://pith.science/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/bundle.json","state":"https://pith.science/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QX6L7H2ZC7AGQBLCPSVOCAFIST/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:QX6L7H2ZC7AGQBLCPSVOCAFIST","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":"64d0b3458a62b6e6cb6ab1dc42a4fb0594d93bafd5c5b800a47b664f3ae06d43","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-15T16:10:08Z","title_canon_sha256":"e6538777039942d89948f85a8b71051575a7a9e509afdd1e315322d5ec046477"},"schema_version":"1.0","source":{"id":"1603.04736","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.04736","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"arxiv_version","alias_value":"1603.04736v1","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.04736","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"pith_short_12","alias_value":"QX6L7H2ZC7AG","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"QX6L7H2ZC7AGQBLC","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"QX6L7H2Z","created_at":"2026-05-18T12:30:41Z"}],"graph_snapshots":[{"event_id":"sha256:6c0f86981e78109a2de485eb6fd24a03eff847d8b386a342a08749cc83dab2aa","target":"graph","created_at":"2026-05-18T00:49:19Z","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":"Understanding stellar birth requires observations of the clouds in which they form. These clouds are dense and self-gravitating, and in all existing observations, they are molecular with H_2 the dominant species and CO the best available tracer. When the abundances of carbon and oxygen are low compared to hydrogen, and the opacity from dust is also low, as in primeval galaxies and local dwarf irregular galaxies, CO forms slowly and is easily destroyed, so it is difficult for it to accumulate inside dense clouds. Here we report interferometric observations of CO clouds in the local group dwarf ","authors_text":"Bruce G. Elmegreen, Deidre A. Hunter, Elias Brinks, Juan R. Cortes, Monica Rubio, Phil Cigan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-15T16:10:08Z","title":"Dense cloud cores revealed by CO in the low metallicity dwarf galaxy WLM"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.04736","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":"sha256:76769c23700f745a9dad138cd0447d993032bc36f98ae1b55ae85757cb4c0cca","target":"record","created_at":"2026-05-18T00:49:19Z","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":"64d0b3458a62b6e6cb6ab1dc42a4fb0594d93bafd5c5b800a47b664f3ae06d43","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-15T16:10:08Z","title_canon_sha256":"e6538777039942d89948f85a8b71051575a7a9e509afdd1e315322d5ec046477"},"schema_version":"1.0","source":{"id":"1603.04736","kind":"arxiv","version":1}},"canonical_sha256":"85fcbf9f5917c06805627caae100a894f5949b29f3eeb3cb604abde0f62a24c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"85fcbf9f5917c06805627caae100a894f5949b29f3eeb3cb604abde0f62a24c3","first_computed_at":"2026-05-18T00:49:19.023996Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:19.023996Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qrjihUMGkd3lMRcJkpa+QH/F/TzB/vnYYQsFN55CHqeHbjRL2fbSEUxoYVW4A6/Uhw7ioFEE7EbSYxIduYXHBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:19.024391Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.04736","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:76769c23700f745a9dad138cd0447d993032bc36f98ae1b55ae85757cb4c0cca","sha256:6c0f86981e78109a2de485eb6fd24a03eff847d8b386a342a08749cc83dab2aa"],"state_sha256":"2eb5e21ddab6de4ab8df8da49bdbd09a4df6e180a116bffabde465315bbdf319"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PR7T5RaWwgENFMq3eSeQ4eyxj9bMkfby4Ccg1+SZRdSic1J/8MRIctuJ7pTK5RtrijfAOQzYxzeOVu3uAtslDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T04:49:09.441458Z","bundle_sha256":"444ba6ba2c19e358f6a89a4d2f86711484b9be3e759f8580fe8ba2b408c91409"}}