{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ZW6XZCBZOR54QYXX6ZWK5WEL7U","short_pith_number":"pith:ZW6XZCBZ","canonical_record":{"source":{"id":"1612.07668","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-22T16:02:13Z","cross_cats_sorted":[],"title_canon_sha256":"46b7a24e70dce49e0e5529d509bc0885c1f2114b4c22db1ead53f51abfcd61dd","abstract_canon_sha256":"7206b4c3915d1e5d1a810f8d06886dc55814a9e22632cc3d03dee938a6477486"},"schema_version":"1.0"},"canonical_sha256":"cdbd7c8839747bc862f7f66caed88bfd04b91c8f866f5f153608b9b0e2cfda97","source":{"kind":"arxiv","id":"1612.07668","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07668","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07668v2","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07668","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"pith_short_12","alias_value":"ZW6XZCBZOR54","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZW6XZCBZOR54QYXX","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZW6XZCBZ","created_at":"2026-05-18T12:30:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ZW6XZCBZOR54QYXX6ZWK5WEL7U","target":"record","payload":{"canonical_record":{"source":{"id":"1612.07668","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-22T16:02:13Z","cross_cats_sorted":[],"title_canon_sha256":"46b7a24e70dce49e0e5529d509bc0885c1f2114b4c22db1ead53f51abfcd61dd","abstract_canon_sha256":"7206b4c3915d1e5d1a810f8d06886dc55814a9e22632cc3d03dee938a6477486"},"schema_version":"1.0"},"canonical_sha256":"cdbd7c8839747bc862f7f66caed88bfd04b91c8f866f5f153608b9b0e2cfda97","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:42:55.140141Z","signature_b64":"gZmPISnZsKNRaXMU/o6UeabdfuCP7diPMy7qZe9jDbXqFwTAAA+/fMGS+QoqsXWjwhkwWzr1nN1LLWfAoWWJBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cdbd7c8839747bc862f7f66caed88bfd04b91c8f866f5f153608b9b0e2cfda97","last_reissued_at":"2026-05-18T00:42:55.139432Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:42:55.139432Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.07668","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:42:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aRybZuEe136+1SY68kFe0pP1MzNAvF+RZp2F6w5RRFTPvvGiHD86x54bQwE3kIA3eyUp/R6OTkK+KhEIfD2pAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T20:33:55.297227Z"},"content_sha256":"a55d3aa627545649c01c328c584afd2ccf8e0feb55c297c135832b829c5914d0","schema_version":"1.0","event_id":"sha256:a55d3aa627545649c01c328c584afd2ccf8e0feb55c297c135832b829c5914d0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ZW6XZCBZOR54QYXX6ZWK5WEL7U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sub-arcsecond imaging of the water emission in Arp 220","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Fuente, D. S. Meier, E. M. L. Humphreys, J. Cernicharo, J. Ott, K. Sakamoto, L.K. Zschaechner, M. Galametz, M. Krips, R. Neri, S. Aalto, S. Garc\\'ia-Burillo, S. K\\\"onig, S. Mart\\'in, S. Muller, T. Mroczkowski, W. H. T. Vlemmings","submitted_at":"2016-12-22T16:02:13Z","abstract_excerpt":"Extragalactic observations of water emission can provide valuable insights into the excitation of the interstellar medium. In addition, extragalactic megamasers are powerful probes of kinematics close to active nuclei. Therefore, it is paramount to determine the true origin of the water emission, whether it is excited by processes close to an AGN or in star-forming regions. We use ALMA Band 5 science verification observations to analyse the emission of the 183 GHz water line in Arp 220 on sub-arcsecond scales, in conjunction with new ALMA Band 7 data at 325 GHz. Specifically, the nature of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07668","kind":"arxiv","version":2},"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":"2026-05-18T00:42:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gOwhhB5Dr9P55uc2Jn5/kvBg35QEB3XCyXrEd258n+l5ffRPnn5CyZK7zfztb0KemUlHlA64MMngTho3YNoSAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T20:33:55.297937Z"},"content_sha256":"375f1dec1305e1be1f3d0e0fb12434bc2588315b210b9c00685336dde915546a","schema_version":"1.0","event_id":"sha256:375f1dec1305e1be1f3d0e0fb12434bc2588315b210b9c00685336dde915546a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/bundle.json","state_url":"https://pith.science/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/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":"2026-06-07T20:33:55Z","links":{"resolver":"https://pith.science/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U","bundle":"https://pith.science/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/bundle.json","state":"https://pith.science/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZW6XZCBZOR54QYXX6ZWK5WEL7U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZW6XZCBZOR54QYXX6ZWK5WEL7U","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":"7206b4c3915d1e5d1a810f8d06886dc55814a9e22632cc3d03dee938a6477486","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-22T16:02:13Z","title_canon_sha256":"46b7a24e70dce49e0e5529d509bc0885c1f2114b4c22db1ead53f51abfcd61dd"},"schema_version":"1.0","source":{"id":"1612.07668","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.07668","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"arxiv_version","alias_value":"1612.07668v2","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.07668","created_at":"2026-05-18T00:42:55Z"},{"alias_kind":"pith_short_12","alias_value":"ZW6XZCBZOR54","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZW6XZCBZOR54QYXX","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZW6XZCBZ","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:375f1dec1305e1be1f3d0e0fb12434bc2588315b210b9c00685336dde915546a","target":"graph","created_at":"2026-05-18T00:42:55Z","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":"Extragalactic observations of water emission can provide valuable insights into the excitation of the interstellar medium. In addition, extragalactic megamasers are powerful probes of kinematics close to active nuclei. Therefore, it is paramount to determine the true origin of the water emission, whether it is excited by processes close to an AGN or in star-forming regions. We use ALMA Band 5 science verification observations to analyse the emission of the 183 GHz water line in Arp 220 on sub-arcsecond scales, in conjunction with new ALMA Band 7 data at 325 GHz. Specifically, the nature of the","authors_text":"A. Fuente, D. S. Meier, E. M. L. Humphreys, J. Cernicharo, J. Ott, K. Sakamoto, L.K. Zschaechner, M. Galametz, M. Krips, R. Neri, S. Aalto, S. Garc\\'ia-Burillo, S. K\\\"onig, S. Mart\\'in, S. Muller, T. Mroczkowski, W. H. T. Vlemmings","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-22T16:02:13Z","title":"Sub-arcsecond imaging of the water emission in Arp 220"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.07668","kind":"arxiv","version":2},"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:a55d3aa627545649c01c328c584afd2ccf8e0feb55c297c135832b829c5914d0","target":"record","created_at":"2026-05-18T00:42:55Z","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":"7206b4c3915d1e5d1a810f8d06886dc55814a9e22632cc3d03dee938a6477486","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-12-22T16:02:13Z","title_canon_sha256":"46b7a24e70dce49e0e5529d509bc0885c1f2114b4c22db1ead53f51abfcd61dd"},"schema_version":"1.0","source":{"id":"1612.07668","kind":"arxiv","version":2}},"canonical_sha256":"cdbd7c8839747bc862f7f66caed88bfd04b91c8f866f5f153608b9b0e2cfda97","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cdbd7c8839747bc862f7f66caed88bfd04b91c8f866f5f153608b9b0e2cfda97","first_computed_at":"2026-05-18T00:42:55.139432Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:55.139432Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gZmPISnZsKNRaXMU/o6UeabdfuCP7diPMy7qZe9jDbXqFwTAAA+/fMGS+QoqsXWjwhkwWzr1nN1LLWfAoWWJBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:55.140141Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.07668","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a55d3aa627545649c01c328c584afd2ccf8e0feb55c297c135832b829c5914d0","sha256:375f1dec1305e1be1f3d0e0fb12434bc2588315b210b9c00685336dde915546a"],"state_sha256":"6e3e902f5df9ffd8ef43fddc92645cd53672efc6bf696c1d98e5c563cdf41bf7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GOeN4W/1IL35OtPzj0z29WDxbEQ5l/D3j77UrXA00OzZRhE/RH9K2cdIfhIfqmA5W2mvBbFTDfXzzB8V41JQAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T20:33:55.301854Z","bundle_sha256":"93be2b77ef7782c9e1169d300114d66ddf9defe122379286215acecf936a8acc"}}