{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:M74IU3R7EEQEE4LJ654JADUGM6","short_pith_number":"pith:M74IU3R7","canonical_record":{"source":{"id":"astro-ph/0302227","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-02-11T22:14:05Z","cross_cats_sorted":[],"title_canon_sha256":"1c8a3dc8f2391791557c94855cd9353910e14a08615b509128795aa251e6ddeb","abstract_canon_sha256":"cd6c50c9a1dfafbc173c78d704eb5882eb67cccc490ba78123b70d1865e50314"},"schema_version":"1.0"},"canonical_sha256":"67f88a6e3f2120427169f778900e8667835ccad7a528a5d9dbb7353328358a8d","source":{"kind":"arxiv","id":"astro-ph/0302227","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0302227","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0302227v1","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0302227","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_12","alias_value":"M74IU3R7EEQE","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_16","alias_value":"M74IU3R7EEQEE4LJ","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_8","alias_value":"M74IU3R7","created_at":"2026-07-04T15:20:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:M74IU3R7EEQEE4LJ654JADUGM6","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0302227","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-02-11T22:14:05Z","cross_cats_sorted":[],"title_canon_sha256":"1c8a3dc8f2391791557c94855cd9353910e14a08615b509128795aa251e6ddeb","abstract_canon_sha256":"cd6c50c9a1dfafbc173c78d704eb5882eb67cccc490ba78123b70d1865e50314"},"schema_version":"1.0"},"canonical_sha256":"67f88a6e3f2120427169f778900e8667835ccad7a528a5d9dbb7353328358a8d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:20:10.728706Z","signature_b64":"EKZUqJyi/D2xjymPWtZLh/tLmf8IAGn82yFzPudl92N0XUK0ZBX1I7od43dBLp6jJMb6XYrGoiscEruhs5b0Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"67f88a6e3f2120427169f778900e8667835ccad7a528a5d9dbb7353328358a8d","last_reissued_at":"2026-07-04T15:20:10.728201Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:20:10.728201Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0302227","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":"2026-07-04T15:20:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xs6dB21AfL4wT3CK0tBw94AcZ5RupwkSPv1o6rY2MlfLCPFGiQM9Wpjk6UWCj7Bsfr2/D8oZQz2qYVZGsavLBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:52:28.878623Z"},"content_sha256":"c9c72d414a331f7065c53c49ec24fd7085db082427bac510b6b2327695cc7b32","schema_version":"1.0","event_id":"sha256:c9c72d414a331f7065c53c49ec24fd7085db082427bac510b6b2327695cc7b32"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:M74IU3R7EEQEE4LJ654JADUGM6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Interferometric Detection of Linear Polarization from Sagittarius A* at 230 GHz","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Donald C. Backer (UCB), Geoffrey C. Bower (UCB), Heino Falcke (MPIfR), Melvyn C.H. Wright (UCB)","submitted_at":"2003-02-11T22:14:05Z","abstract_excerpt":"We measured the linear polarization of Sagittarius A* to be 7.2 +/- 0.6 % at 230 GHzusing the BIMA array with a resolution of 3.6 x 0.9 arcsec. This confirms the previously reported detection with the JCMT 14-m antenna. Our high resolution observations demonstrate that the polarization does not arise from dust but from a synchrotron source associated with Sgr A*. We see no change in the polarization position angle and only a small change in the polarization fraction in four observations distributed over 60 days. We find a position angle 139 +/- 4 degrees that differs substantially from what wa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0302227","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/astro-ph/0302227/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":"2026-07-04T15:20:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H/Imo/7Xb+s2e4Yv8GSeSjOmuUjI/VdbODfhcspYzc4yKgHzxSjzPjxBNVb+A65AHW7/XaXyD0ZxcExXfz4NCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T23:52:28.879253Z"},"content_sha256":"8c1384e064f6a96f8a26afd0ee8a611d2ffbb55cb0f964d30293a263f63cd68e","schema_version":"1.0","event_id":"sha256:8c1384e064f6a96f8a26afd0ee8a611d2ffbb55cb0f964d30293a263f63cd68e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M74IU3R7EEQEE4LJ654JADUGM6/bundle.json","state_url":"https://pith.science/pith/M74IU3R7EEQEE4LJ654JADUGM6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M74IU3R7EEQEE4LJ654JADUGM6/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":"2026-08-14T23:52:28Z","links":{"resolver":"https://pith.science/pith/M74IU3R7EEQEE4LJ654JADUGM6","bundle":"https://pith.science/pith/M74IU3R7EEQEE4LJ654JADUGM6/bundle.json","state":"https://pith.science/pith/M74IU3R7EEQEE4LJ654JADUGM6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M74IU3R7EEQEE4LJ654JADUGM6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:M74IU3R7EEQEE4LJ654JADUGM6","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":"cd6c50c9a1dfafbc173c78d704eb5882eb67cccc490ba78123b70d1865e50314","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-02-11T22:14:05Z","title_canon_sha256":"1c8a3dc8f2391791557c94855cd9353910e14a08615b509128795aa251e6ddeb"},"schema_version":"1.0","source":{"id":"astro-ph/0302227","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0302227","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0302227v1","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0302227","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_12","alias_value":"M74IU3R7EEQE","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_16","alias_value":"M74IU3R7EEQEE4LJ","created_at":"2026-07-04T15:20:10Z"},{"alias_kind":"pith_short_8","alias_value":"M74IU3R7","created_at":"2026-07-04T15:20:10Z"}],"graph_snapshots":[{"event_id":"sha256:8c1384e064f6a96f8a26afd0ee8a611d2ffbb55cb0f964d30293a263f63cd68e","target":"graph","created_at":"2026-07-04T15:20:10Z","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/astro-ph/0302227/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We measured the linear polarization of Sagittarius A* to be 7.2 +/- 0.6 % at 230 GHzusing the BIMA array with a resolution of 3.6 x 0.9 arcsec. This confirms the previously reported detection with the JCMT 14-m antenna. Our high resolution observations demonstrate that the polarization does not arise from dust but from a synchrotron source associated with Sgr A*. We see no change in the polarization position angle and only a small change in the polarization fraction in four observations distributed over 60 days. We find a position angle 139 +/- 4 degrees that differs substantially from what wa","authors_text":"Donald C. Backer (UCB), Geoffrey C. Bower (UCB), Heino Falcke (MPIfR), Melvyn C.H. Wright (UCB)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-02-11T22:14:05Z","title":"Interferometric Detection of Linear Polarization from Sagittarius A* at 230 GHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0302227","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:c9c72d414a331f7065c53c49ec24fd7085db082427bac510b6b2327695cc7b32","target":"record","created_at":"2026-07-04T15:20:10Z","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":"cd6c50c9a1dfafbc173c78d704eb5882eb67cccc490ba78123b70d1865e50314","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-02-11T22:14:05Z","title_canon_sha256":"1c8a3dc8f2391791557c94855cd9353910e14a08615b509128795aa251e6ddeb"},"schema_version":"1.0","source":{"id":"astro-ph/0302227","kind":"arxiv","version":1}},"canonical_sha256":"67f88a6e3f2120427169f778900e8667835ccad7a528a5d9dbb7353328358a8d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"67f88a6e3f2120427169f778900e8667835ccad7a528a5d9dbb7353328358a8d","first_computed_at":"2026-07-04T15:20:10.728201Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:20:10.728201Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EKZUqJyi/D2xjymPWtZLh/tLmf8IAGn82yFzPudl92N0XUK0ZBX1I7od43dBLp6jJMb6XYrGoiscEruhs5b0Ag==","signature_status":"signed_v1","signed_at":"2026-07-04T15:20:10.728706Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0302227","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c9c72d414a331f7065c53c49ec24fd7085db082427bac510b6b2327695cc7b32","sha256:8c1384e064f6a96f8a26afd0ee8a611d2ffbb55cb0f964d30293a263f63cd68e"],"state_sha256":"6cc7dba36239124f4b158293fe2dadd742e0f594c1738fd7e937d40df7f0149d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3FQ7Qp4PpaA/y6vL4h8Ip+eCSokufwwR+VSywYNOWntvFzyNol174kS9NpJ5+92hdVyaBJ34c85oE4F2940GDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T23:52:28.885116Z","bundle_sha256":"4ae48094553d1b2075384d1440822fc980e75d18d7f55f00766d53eebce87fb8"}}