{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:NWRJGFQIWM6SBVV2SCDI6VEPL6","short_pith_number":"pith:NWRJGFQI","canonical_record":{"source":{"id":"1603.01291","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-03T21:44:54Z","cross_cats_sorted":[],"title_canon_sha256":"1fa37b4dbfa8aa4a7a6f097b33e2c2192c65eb724aa78760e092d6bfa0bdda52","abstract_canon_sha256":"5448a00acd5c30114e5d90afbbf2bc58195475e825f9929f3d3c7378fe6207ad"},"schema_version":"1.0"},"canonical_sha256":"6da2931608b33d20d6ba90868f548f5f88eda30b73ec6a567315f9f8306fd5da","source":{"kind":"arxiv","id":"1603.01291","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.01291","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"arxiv_version","alias_value":"1603.01291v1","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.01291","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"pith_short_12","alias_value":"NWRJGFQIWM6S","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"NWRJGFQIWM6SBVV2","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"NWRJGFQI","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:NWRJGFQIWM6SBVV2SCDI6VEPL6","target":"record","payload":{"canonical_record":{"source":{"id":"1603.01291","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-03T21:44:54Z","cross_cats_sorted":[],"title_canon_sha256":"1fa37b4dbfa8aa4a7a6f097b33e2c2192c65eb724aa78760e092d6bfa0bdda52","abstract_canon_sha256":"5448a00acd5c30114e5d90afbbf2bc58195475e825f9929f3d3c7378fe6207ad"},"schema_version":"1.0"},"canonical_sha256":"6da2931608b33d20d6ba90868f548f5f88eda30b73ec6a567315f9f8306fd5da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:42.020061Z","signature_b64":"tC3WAphGt0cSQsHQFhm4m44+o1iSFg106cmnqZXAftAAcJC3186SakHXK1LPJM3pOq4qzb4eV8tymgUGwRmaBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6da2931608b33d20d6ba90868f548f5f88eda30b73ec6a567315f9f8306fd5da","last_reissued_at":"2026-05-18T01:15:42.018976Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:42.018976Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1603.01291","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":"2026-05-18T01:15:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ijS8w2GSLwjaEClPHY60VbLGOdFQvJEVbFnInC8e234gSLfakSREFygHrZbfA5F7frxEn5qP2nTNyRvmqSAaDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:01:30.571613Z"},"content_sha256":"5632169ba59f223ab734799227bb25e4962218dc1c9250171ab7b15284373d30","schema_version":"1.0","event_id":"sha256:5632169ba59f223ab734799227bb25e4962218dc1c9250171ab7b15284373d30"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:NWRJGFQIWM6SBVV2SCDI6VEPL6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The unbearable opaqueness of Arp 220","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C. Henkel, E. Gonz\\'alez-Alfonso, F. Costagliola, J. Mart\\'in-Pintado, K. Sakamoto, M. Krips, N. Harada, P. van der Werf, R. Aladro, S. Aalto, S. Garc\\'ia-Burillo, S. Mart\\'in, S. M\\\"uhle, S. Muller, S. Viti","submitted_at":"2016-03-03T21:44:54Z","abstract_excerpt":"We explore the potential of imaging vibrationally excited molecular emission at high angular resolution to better understand the morphology and physical structure of the dense gas in Arp~220 and to gain insight into the nature of the nuclear powering sources. Vibrationally excited emission of HCN is detected in both nuclei with a very high ratio relative to the total $L_{FIR}$, higher than in any other observed galaxy and well above what is observed in Galactic hot cores. HCN $v_2=1f$ is observed to be marginally resolved in $\\sim60\\times50$~pc regions inside the dusty $\\sim100$~pc sized nucle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.01291","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":"2026-05-18T01:15:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bN+Nqm6+KkeEFjY+04hj2YhUCN0mDguqMV6croMYOCy3CO/ZH9b+9otENMIIFvLQ4z+OciciXyhsbhSRiG2FDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:01:30.572201Z"},"content_sha256":"8063f8adba5cd3a7336d870c5af92c237db2033e03c4f6a1280653ca4e26d0da","schema_version":"1.0","event_id":"sha256:8063f8adba5cd3a7336d870c5af92c237db2033e03c4f6a1280653ca4e26d0da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/bundle.json","state_url":"https://pith.science/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/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":"2026-05-26T16:01:30Z","links":{"resolver":"https://pith.science/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6","bundle":"https://pith.science/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/bundle.json","state":"https://pith.science/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NWRJGFQIWM6SBVV2SCDI6VEPL6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:NWRJGFQIWM6SBVV2SCDI6VEPL6","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":"5448a00acd5c30114e5d90afbbf2bc58195475e825f9929f3d3c7378fe6207ad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-03T21:44:54Z","title_canon_sha256":"1fa37b4dbfa8aa4a7a6f097b33e2c2192c65eb724aa78760e092d6bfa0bdda52"},"schema_version":"1.0","source":{"id":"1603.01291","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.01291","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"arxiv_version","alias_value":"1603.01291v1","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.01291","created_at":"2026-05-18T01:15:42Z"},{"alias_kind":"pith_short_12","alias_value":"NWRJGFQIWM6S","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"NWRJGFQIWM6SBVV2","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"NWRJGFQI","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:8063f8adba5cd3a7336d870c5af92c237db2033e03c4f6a1280653ca4e26d0da","target":"graph","created_at":"2026-05-18T01:15:42Z","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 explore the potential of imaging vibrationally excited molecular emission at high angular resolution to better understand the morphology and physical structure of the dense gas in Arp~220 and to gain insight into the nature of the nuclear powering sources. Vibrationally excited emission of HCN is detected in both nuclei with a very high ratio relative to the total $L_{FIR}$, higher than in any other observed galaxy and well above what is observed in Galactic hot cores. HCN $v_2=1f$ is observed to be marginally resolved in $\\sim60\\times50$~pc regions inside the dusty $\\sim100$~pc sized nucle","authors_text":"C. Henkel, E. Gonz\\'alez-Alfonso, F. Costagliola, J. Mart\\'in-Pintado, K. Sakamoto, M. Krips, N. Harada, P. van der Werf, R. Aladro, S. Aalto, S. Garc\\'ia-Burillo, S. Mart\\'in, S. M\\\"uhle, S. Muller, S. Viti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-03T21:44:54Z","title":"The unbearable opaqueness of Arp 220"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.01291","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":"sha256:5632169ba59f223ab734799227bb25e4962218dc1c9250171ab7b15284373d30","target":"record","created_at":"2026-05-18T01:15:42Z","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":"5448a00acd5c30114e5d90afbbf2bc58195475e825f9929f3d3c7378fe6207ad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-03T21:44:54Z","title_canon_sha256":"1fa37b4dbfa8aa4a7a6f097b33e2c2192c65eb724aa78760e092d6bfa0bdda52"},"schema_version":"1.0","source":{"id":"1603.01291","kind":"arxiv","version":1}},"canonical_sha256":"6da2931608b33d20d6ba90868f548f5f88eda30b73ec6a567315f9f8306fd5da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6da2931608b33d20d6ba90868f548f5f88eda30b73ec6a567315f9f8306fd5da","first_computed_at":"2026-05-18T01:15:42.018976Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:42.018976Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tC3WAphGt0cSQsHQFhm4m44+o1iSFg106cmnqZXAftAAcJC3186SakHXK1LPJM3pOq4qzb4eV8tymgUGwRmaBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:42.020061Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.01291","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5632169ba59f223ab734799227bb25e4962218dc1c9250171ab7b15284373d30","sha256:8063f8adba5cd3a7336d870c5af92c237db2033e03c4f6a1280653ca4e26d0da"],"state_sha256":"89f5b745a2f092893b46537e6688770632ada0a1b25afa4fc3a28fd6c9df3761"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WEQ7hEPMbh8KCfmFgItFDly4kUv2scwveGgze0xMuwy/iyBTPffDv+8zZ+bLaFmxGJjO2TYznmSOcc7yqgBVCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:01:30.575514Z","bundle_sha256":"e30b807b72489946480f3065e82b70b4d33343f89a37e5a5c73b1fb0a02b9a2f"}}