{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:S2VKVBOMARXZO4POLGMQWVD5KN","short_pith_number":"pith:S2VKVBOM","canonical_record":{"source":{"id":"1803.09982","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-27T09:33:37Z","cross_cats_sorted":["astro-ph.CO","astro-ph.HE"],"title_canon_sha256":"03982b0a8479ec62b0ac16f525631443c0d8857dbc68c673aa68af85358f6494","abstract_canon_sha256":"0e279fa5acf092dec9b842a8059b5957704c5b96fa5f15b61bcf6c663fb3f135"},"schema_version":"1.0"},"canonical_sha256":"96aaaa85cc046f9771ee59990b547d53428dbb2a34ac51892868e466442e5400","source":{"kind":"arxiv","id":"1803.09982","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.09982","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"arxiv_version","alias_value":"1803.09982v3","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.09982","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"pith_short_12","alias_value":"S2VKVBOMARXZ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"S2VKVBOMARXZO4PO","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"S2VKVBOM","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:S2VKVBOMARXZO4POLGMQWVD5KN","target":"record","payload":{"canonical_record":{"source":{"id":"1803.09982","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-27T09:33:37Z","cross_cats_sorted":["astro-ph.CO","astro-ph.HE"],"title_canon_sha256":"03982b0a8479ec62b0ac16f525631443c0d8857dbc68c673aa68af85358f6494","abstract_canon_sha256":"0e279fa5acf092dec9b842a8059b5957704c5b96fa5f15b61bcf6c663fb3f135"},"schema_version":"1.0"},"canonical_sha256":"96aaaa85cc046f9771ee59990b547d53428dbb2a34ac51892868e466442e5400","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:34.007298Z","signature_b64":"dMxdYfNg02PSSD5ivpKH8ESPtjdJxFCVoHw+hYRZxh/zysFKEbcga156bLOMJwSV+1YFcyT68d2fFxszu/w3Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"96aaaa85cc046f9771ee59990b547d53428dbb2a34ac51892868e466442e5400","last_reissued_at":"2026-05-17T23:51:34.006625Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:34.006625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.09982","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:51:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R1AhG4gyCsvz6b3R54eUt5g541gT5dOyQmkNjIk78q6mh8OnQC+BkxVr6XBUpjsyezmLKg75cyV4y1myxQRlBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:52:21.883053Z"},"content_sha256":"080e196fbda9f10f24ccbb6d3ce8388dc0b02774673e8fdeba09c6215eda6f56","schema_version":"1.0","event_id":"sha256:080e196fbda9f10f24ccbb6d3ce8388dc0b02774673e8fdeba09c6215eda6f56"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:S2VKVBOMARXZO4POLGMQWVD5KN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Magnetic field at a jet base: extreme Faraday rotation in 3C 273 revealed by ALMA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"A. Tchekhovskoy, I. Mart\\'i-Vidal, S. O'Sullivan, T. Hovatta, T. Savolainen","submitted_at":"2018-03-27T09:33:37Z","abstract_excerpt":"We studied the polarization behavior of the quasar 3C 273 over the 1 mm wavelength band at ALMA with a total bandwidth of 7.5GHz across 223 to 243 GHz at 0.8 arcsec resolution, corresponding to 2.1 kpc at the distance of 3C 273. With these observations we were able to probe the optically thin polarized emission close to the jet base, and constrain the magnetic field structure. We computed the Faraday rotation measure using simple linear fitting and Faraday rotation measure synthesis. In addition, we modeled the broadband behavior of the fractional Stokes Q and U parameters (qu-fitting). The sy"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.09982","kind":"arxiv","version":3},"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":"2026-05-17T23:51:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I3E6S6+LWB8+z5ot+iJyAFDMFY02aVL2iLLBhWTLc7VPkea9dpfMolxxkWFk7ttVitdPQ/gxdaFvPa/CEHAECg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T16:52:21.883416Z"},"content_sha256":"53a43f5ac0a30b2fdf0737e2aef5ab1cf2149fee0b496178e6e6c501a899dc44","schema_version":"1.0","event_id":"sha256:53a43f5ac0a30b2fdf0737e2aef5ab1cf2149fee0b496178e6e6c501a899dc44"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S2VKVBOMARXZO4POLGMQWVD5KN/bundle.json","state_url":"https://pith.science/pith/S2VKVBOMARXZO4POLGMQWVD5KN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S2VKVBOMARXZO4POLGMQWVD5KN/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":"2026-06-05T16:52:21Z","links":{"resolver":"https://pith.science/pith/S2VKVBOMARXZO4POLGMQWVD5KN","bundle":"https://pith.science/pith/S2VKVBOMARXZO4POLGMQWVD5KN/bundle.json","state":"https://pith.science/pith/S2VKVBOMARXZO4POLGMQWVD5KN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S2VKVBOMARXZO4POLGMQWVD5KN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:S2VKVBOMARXZO4POLGMQWVD5KN","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":"0e279fa5acf092dec9b842a8059b5957704c5b96fa5f15b61bcf6c663fb3f135","cross_cats_sorted":["astro-ph.CO","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-27T09:33:37Z","title_canon_sha256":"03982b0a8479ec62b0ac16f525631443c0d8857dbc68c673aa68af85358f6494"},"schema_version":"1.0","source":{"id":"1803.09982","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.09982","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"arxiv_version","alias_value":"1803.09982v3","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.09982","created_at":"2026-05-17T23:51:34Z"},{"alias_kind":"pith_short_12","alias_value":"S2VKVBOMARXZ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"S2VKVBOMARXZO4PO","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"S2VKVBOM","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:53a43f5ac0a30b2fdf0737e2aef5ab1cf2149fee0b496178e6e6c501a899dc44","target":"graph","created_at":"2026-05-17T23:51:34Z","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 studied the polarization behavior of the quasar 3C 273 over the 1 mm wavelength band at ALMA with a total bandwidth of 7.5GHz across 223 to 243 GHz at 0.8 arcsec resolution, corresponding to 2.1 kpc at the distance of 3C 273. With these observations we were able to probe the optically thin polarized emission close to the jet base, and constrain the magnetic field structure. We computed the Faraday rotation measure using simple linear fitting and Faraday rotation measure synthesis. In addition, we modeled the broadband behavior of the fractional Stokes Q and U parameters (qu-fitting). The sy","authors_text":"A. Tchekhovskoy, I. Mart\\'i-Vidal, S. O'Sullivan, T. Hovatta, T. Savolainen","cross_cats":["astro-ph.CO","astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-27T09:33:37Z","title":"Magnetic field at a jet base: extreme Faraday rotation in 3C 273 revealed by ALMA"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.09982","kind":"arxiv","version":3},"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":"sha256:080e196fbda9f10f24ccbb6d3ce8388dc0b02774673e8fdeba09c6215eda6f56","target":"record","created_at":"2026-05-17T23:51:34Z","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":"0e279fa5acf092dec9b842a8059b5957704c5b96fa5f15b61bcf6c663fb3f135","cross_cats_sorted":["astro-ph.CO","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-03-27T09:33:37Z","title_canon_sha256":"03982b0a8479ec62b0ac16f525631443c0d8857dbc68c673aa68af85358f6494"},"schema_version":"1.0","source":{"id":"1803.09982","kind":"arxiv","version":3}},"canonical_sha256":"96aaaa85cc046f9771ee59990b547d53428dbb2a34ac51892868e466442e5400","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"96aaaa85cc046f9771ee59990b547d53428dbb2a34ac51892868e466442e5400","first_computed_at":"2026-05-17T23:51:34.006625Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:34.006625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dMxdYfNg02PSSD5ivpKH8ESPtjdJxFCVoHw+hYRZxh/zysFKEbcga156bLOMJwSV+1YFcyT68d2fFxszu/w3Cw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:34.007298Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.09982","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:080e196fbda9f10f24ccbb6d3ce8388dc0b02774673e8fdeba09c6215eda6f56","sha256:53a43f5ac0a30b2fdf0737e2aef5ab1cf2149fee0b496178e6e6c501a899dc44"],"state_sha256":"1889790c0f2f50b2d3209aa6d70cd53af85647199e7e5e423f398e3f84c9bfe0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"drO0md8659qqpIpfvRYu8jatHYW3ftna3HvkpAMKM76vTHvNXxh/ff5gqi5ScTmK0uBMEIx1IzzwEJ17KZ/fBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T16:52:21.885603Z","bundle_sha256":"c4a70b23fa60e0965b0d6a827ec5fb28e32526b3382ecf24c549b46f080d4c9c"}}