{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:F4P4IQBSCDD6QIQ3VJJELIXC3H","short_pith_number":"pith:F4P4IQBS","canonical_record":{"source":{"id":"2105.02272","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-05T18:34:59Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"fa18775b72fb70d76020d7c3244dd31aad9d78728b1c31b13f2b15c9b765e19c","abstract_canon_sha256":"b89cd20a44780b1e9a94e7f0013955f9a97513e2fcf8fee910ff20fca0e6e928"},"schema_version":"1.0"},"canonical_sha256":"2f1fc4403210c7e8221baa5245a2e2d9d0f7ece8751fb71c01d7bd794c3894ce","source":{"kind":"arxiv","id":"2105.02272","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.02272","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"arxiv_version","alias_value":"2105.02272v1","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.02272","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_12","alias_value":"F4P4IQBSCDD6","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_16","alias_value":"F4P4IQBSCDD6QIQ3","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_8","alias_value":"F4P4IQBS","created_at":"2026-07-05T02:37:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:F4P4IQBSCDD6QIQ3VJJELIXC3H","target":"record","payload":{"canonical_record":{"source":{"id":"2105.02272","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-05T18:34:59Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"fa18775b72fb70d76020d7c3244dd31aad9d78728b1c31b13f2b15c9b765e19c","abstract_canon_sha256":"b89cd20a44780b1e9a94e7f0013955f9a97513e2fcf8fee910ff20fca0e6e928"},"schema_version":"1.0"},"canonical_sha256":"2f1fc4403210c7e8221baa5245a2e2d9d0f7ece8751fb71c01d7bd794c3894ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:37:59.867854Z","signature_b64":"NaWktISQ5o6ryaaJ/Udd5Tw/k12GKoZYFK7ql5sd8+TXnBlFbQXp0JhUsIBKnxNpCmV7eterwzJJpF/zJjCtCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2f1fc4403210c7e8221baa5245a2e2d9d0f7ece8751fb71c01d7bd794c3894ce","last_reissued_at":"2026-07-05T02:37:59.867459Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:37:59.867459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.02272","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":"2026-07-05T02:37:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pp3vI9rXnS6ARIqyk0eC98eGJS3Kb0vqWp4VujlZYTxz+tH9iqU0MKtKGhUIr2pYmtrrjL2XE/iyeZ7ZKPtBAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T16:02:16.509482Z"},"content_sha256":"2da7d6ec8e706f1bfb0d36c847342105ccd97413ef674528d78cc8f76bf83b24","schema_version":"1.0","event_id":"sha256:2da7d6ec8e706f1bfb0d36c847342105ccd97413ef674528d78cc8f76bf83b24"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:F4P4IQBSCDD6QIQ3VJJELIXC3H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarimetric properties of Event Horizon Telescope targets from ALMA","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.IM"],"primary_cat":"astro-ph.GA","authors_text":"Adam Ingram, A. Gopakumar, Angelo Ricarte, Antonio Hernandez-Gomez, Antonios Nathanail, Avery E. Broderick, Ciriaco Goddi, C. M. Violette Impellizzeri, Daniel P. Marrone, Eduardo Ros, Florian Rosch, Gabriele Bruni, Geoffrey B. Crew, Geoffrey C. Bower, Hiroshi Nagai, Hugo Messias, Ivan Marti-Vidal, Jason Dexter, Jose L. Gomez, Juan Carlos Algaba, Keiichi Asada, Lynn D. Matthews, Manel Perucho, Matthias Kadler, Mauri Valtonen, Michael Janssen, Monika Moscibrodzka, Rocco Lico, Ruben Herrero-Illana, S. Komossa, The Event Horizon Telescope Collaboration, Thomas P. Krichbaum, Y. Y. Kovalev Dirk Muders, Ziri Younsi","submitted_at":"2021-05-05T18:34:59Z","abstract_excerpt":"We present the results from a full polarization study carried out with ALMA during the first VLBI campaign, which was conducted in Apr 2017 in the $\\lambda$3mm and $\\lambda$1.3mm bands, in concert with the Global mm-VLBI Array (GMVA) and the Event Horizon Telescope (EHT), respectively. We determine the polarization and Faraday properties of all VLBI targets, including Sgr A*, M87, and a dozen radio-loud AGN. We detect high linear polarization fractions (2-15%) and large rotation measures (RM $>10^{3.3}-10^{5.5}$ rad m$^{-2}$). For Sgr A* we report a mean RM of $(-4.2\\pm0.3) \\times10^5$ rad m$^"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.02272","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2105.02272/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:37:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LlYU9G7aRTlgdXur82v/UN6q0idqVJPOCpQRhWwganLEZkfMXB8anzoffz94mnpiPnGNJNFzsI4kX5C/Q1ZACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T16:02:16.509818Z"},"content_sha256":"ef3a51a932fe55d5621eddcf3106f3bc1e78febd2edb434018fa3393d7d04cb5","schema_version":"1.0","event_id":"sha256:ef3a51a932fe55d5621eddcf3106f3bc1e78febd2edb434018fa3393d7d04cb5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/bundle.json","state_url":"https://pith.science/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/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":"2026-08-02T16:02:16Z","links":{"resolver":"https://pith.science/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H","bundle":"https://pith.science/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/bundle.json","state":"https://pith.science/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F4P4IQBSCDD6QIQ3VJJELIXC3H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:F4P4IQBSCDD6QIQ3VJJELIXC3H","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":"b89cd20a44780b1e9a94e7f0013955f9a97513e2fcf8fee910ff20fca0e6e928","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-05T18:34:59Z","title_canon_sha256":"fa18775b72fb70d76020d7c3244dd31aad9d78728b1c31b13f2b15c9b765e19c"},"schema_version":"1.0","source":{"id":"2105.02272","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.02272","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"arxiv_version","alias_value":"2105.02272v1","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.02272","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_12","alias_value":"F4P4IQBSCDD6","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_16","alias_value":"F4P4IQBSCDD6QIQ3","created_at":"2026-07-05T02:37:59Z"},{"alias_kind":"pith_short_8","alias_value":"F4P4IQBS","created_at":"2026-07-05T02:37:59Z"}],"graph_snapshots":[{"event_id":"sha256:ef3a51a932fe55d5621eddcf3106f3bc1e78febd2edb434018fa3393d7d04cb5","target":"graph","created_at":"2026-07-05T02:37:59Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2105.02272/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the results from a full polarization study carried out with ALMA during the first VLBI campaign, which was conducted in Apr 2017 in the $\\lambda$3mm and $\\lambda$1.3mm bands, in concert with the Global mm-VLBI Array (GMVA) and the Event Horizon Telescope (EHT), respectively. We determine the polarization and Faraday properties of all VLBI targets, including Sgr A*, M87, and a dozen radio-loud AGN. We detect high linear polarization fractions (2-15%) and large rotation measures (RM $>10^{3.3}-10^{5.5}$ rad m$^{-2}$). For Sgr A* we report a mean RM of $(-4.2\\pm0.3) \\times10^5$ rad m$^","authors_text":"Adam Ingram, A. Gopakumar, Angelo Ricarte, Antonio Hernandez-Gomez, Antonios Nathanail, Avery E. Broderick, Ciriaco Goddi, C. M. Violette Impellizzeri, Daniel P. Marrone, Eduardo Ros, Florian Rosch, Gabriele Bruni, Geoffrey B. Crew, Geoffrey C. Bower, Hiroshi Nagai, Hugo Messias, Ivan Marti-Vidal, Jason Dexter, Jose L. Gomez, Juan Carlos Algaba, Keiichi Asada, Lynn D. Matthews, Manel Perucho, Matthias Kadler, Mauri Valtonen, Michael Janssen, Monika Moscibrodzka, Rocco Lico, Ruben Herrero-Illana, S. Komossa, The Event Horizon Telescope Collaboration, Thomas P. Krichbaum, Y. Y. Kovalev Dirk Muders, Ziri Younsi","cross_cats":["astro-ph.HE","astro-ph.IM"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-05T18:34:59Z","title":"Polarimetric properties of Event Horizon Telescope targets from ALMA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.02272","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":"sha256:2da7d6ec8e706f1bfb0d36c847342105ccd97413ef674528d78cc8f76bf83b24","target":"record","created_at":"2026-07-05T02:37:59Z","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":"b89cd20a44780b1e9a94e7f0013955f9a97513e2fcf8fee910ff20fca0e6e928","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-05-05T18:34:59Z","title_canon_sha256":"fa18775b72fb70d76020d7c3244dd31aad9d78728b1c31b13f2b15c9b765e19c"},"schema_version":"1.0","source":{"id":"2105.02272","kind":"arxiv","version":1}},"canonical_sha256":"2f1fc4403210c7e8221baa5245a2e2d9d0f7ece8751fb71c01d7bd794c3894ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2f1fc4403210c7e8221baa5245a2e2d9d0f7ece8751fb71c01d7bd794c3894ce","first_computed_at":"2026-07-05T02:37:59.867459Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:37:59.867459Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NaWktISQ5o6ryaaJ/Udd5Tw/k12GKoZYFK7ql5sd8+TXnBlFbQXp0JhUsIBKnxNpCmV7eterwzJJpF/zJjCtCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:37:59.867854Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.02272","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2da7d6ec8e706f1bfb0d36c847342105ccd97413ef674528d78cc8f76bf83b24","sha256:ef3a51a932fe55d5621eddcf3106f3bc1e78febd2edb434018fa3393d7d04cb5"],"state_sha256":"ccfaa36c542ceb7eb55db37b61e50bc6944736bc8de30f3c0d30aff21a3b9002"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fl7cR/WfUq1mO1F1YsWFeNN1R7E7/PUVvWZ6979B4sFo3em2oVBOg9bXsHWkGmrlU891wxJvCtWFYv9DrpMlDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T16:02:16.512292Z","bundle_sha256":"167665ffb5d5b6c978b8f58226a5045a612d218809979537a4e7587edcaf790f"}}