{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:4ZFLQT3JCCVZLBNJHAXYJZL2OA","short_pith_number":"pith:4ZFLQT3J","canonical_record":{"source":{"id":"1401.2876","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-13T15:39:43Z","cross_cats_sorted":[],"title_canon_sha256":"367ab3ed231ff885186521d636983e29de51134c93ac535dcdd179efdf4b28dc","abstract_canon_sha256":"2f20436b8390ff51ac4137c88418eb2f1456b27cc8fc329df3a6908c5da8495d"},"schema_version":"1.0"},"canonical_sha256":"e64ab84f6910ab9585a9382f84e57a701b2b541de03cf7b402f43f036a497a2a","source":{"kind":"arxiv","id":"1401.2876","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.2876","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"arxiv_version","alias_value":"1401.2876v1","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.2876","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"pith_short_12","alias_value":"4ZFLQT3JCCVZ","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"4ZFLQT3JCCVZLBNJ","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"4ZFLQT3J","created_at":"2026-05-18T12:28:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:4ZFLQT3JCCVZLBNJHAXYJZL2OA","target":"record","payload":{"canonical_record":{"source":{"id":"1401.2876","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-13T15:39:43Z","cross_cats_sorted":[],"title_canon_sha256":"367ab3ed231ff885186521d636983e29de51134c93ac535dcdd179efdf4b28dc","abstract_canon_sha256":"2f20436b8390ff51ac4137c88418eb2f1456b27cc8fc329df3a6908c5da8495d"},"schema_version":"1.0"},"canonical_sha256":"e64ab84f6910ab9585a9382f84e57a701b2b541de03cf7b402f43f036a497a2a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:26.168355Z","signature_b64":"+sqKGSVbrWnCUUDZQ7u20/nxvZ1jv9inZSr9fJUyobI9gVkiyCRQsmRsX171/LuYO2GgfL9mHUN4T4Ja5wlHAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e64ab84f6910ab9585a9382f84e57a701b2b541de03cf7b402f43f036a497a2a","last_reissued_at":"2026-05-18T01:45:26.167871Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:26.167871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.2876","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":"2026-05-18T01:45:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FTj17N7Xs5tnngpHZnEozeeMH6Q6oWxcZiQx4BwNP2BlYH/wkxTQVtDNtuUJ7dokka2SRV3r0NuvEFTi0wZeDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:47:30.045844Z"},"content_sha256":"8052aa6645a9f81443319b0117f38ffedb2c405ca45a9fa0c327d709805b7436","schema_version":"1.0","event_id":"sha256:8052aa6645a9f81443319b0117f38ffedb2c405ca45a9fa0c327d709805b7436"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:4ZFLQT3JCCVZLBNJHAXYJZL2OA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of Carbon Radio Recombination Lines in absorption towards Cygnus~A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Alexov, A. Asgekar, A. Bonafede, A. Corstanje, A.G.G.M. Tielens, A.G. Polatidis, A. Horneffer, A. Karastergiou, A.M.M. Scaife, A. Schoenmakers, A. Shulevski, A. van der Horst, A.Zensus, B. Ciardi, B.W. Stappers, C. Ferrari, C. Sobey, C. Tasse, C. Toribio, C. Vocks, C. Vogt, D.D. Mulcahy, D. Engels, D. Schwarz, E. de Geus, E. Juette, E. Orru, F. Batejat, F. Breitling, F. De Gasperin, F. Salgado, G. Bernardi, G. Heald, G.J. White, G. Kuper, G. Macario, G. Mann, H. Falcke, H.J.A. Rottgering, H. Munk, H. Paas, H.R. Butcher, I.M. Avruch, I. van Bemmel, J. Anderson, J. Broderick, J.B.R. Oonk, J.C.A. Miller-Jones, J.D. Mol, J.E. Conway, J. Eisloeffel, J. Griessmeier, J. Kohler, J.P. Hamaker, J.P. McKean, J. Sluman, J. Swinbank, J. van Enst, J. van Leeuwen, J.W.T. Hessels, L.K. Morabito, M.A. Garrett, M. Brentjens, M. Brueggen, M. de Vos, M.E. Bell, M. Hoeft, M. Iacobelli, M.J. Bentum, M.J. Norden, M. Kramer, M. Kuniyoshi, M. Mevius, M. Pandey-Pommier, M. Steinmetz, M. Tagger, M.W. Wise, N.J. Jackson, O. Smirnov, O. Wucknitz, P. Best, P. Maat, P. Zarka, R.A. Fallows, R.A.M.J. Wijers, R. Beck, R. Fender, R.J. van Weeren, R. Pizzo, R. van Nieuwpoort, R. Vermeulen, S. Duscha, S. Markoff, S. ter Veen, S. Thoudam, S. Yatawatta, T.E. Hassall, V.I. Kondratiev, V. N. Pandey, W. Frieswijk, W. Klijn, W. Reich, Y. Tang","submitted_at":"2014-01-13T15:39:43Z","abstract_excerpt":"We present the first detection of carbon radio recombination line absorption along the line of sight to Cygnus A. The observations were carried out with the LOw Frequency ARray in the 33 to 57 MHz range. These low frequency radio observations provide us with a new line of sight to study the diffuse, neutral gas in our Galaxy. To our knowledge this is the first time that foreground Milky Way recombination line absorption has been observed against a bright extragalactic background source.\n  By stacking 48 carbon $\\alpha$ lines in the observed frequency range we detect carbon absorption with a si"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.2876","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":"2026-05-18T01:45:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AmnrK2jTpcOQebiHE2pTCleeeIG9ZkZKttcG3oUFq/FovarPusgpMJtT6Vq0MdaISGpCqyS50woFSzIw8IUsAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:47:30.046352Z"},"content_sha256":"145d39f6a4e537c9e09bb575b6f4a30e73b00190039582a635f738cee0685a2d","schema_version":"1.0","event_id":"sha256:145d39f6a4e537c9e09bb575b6f4a30e73b00190039582a635f738cee0685a2d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/bundle.json","state_url":"https://pith.science/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/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":"2026-05-26T23:47:30Z","links":{"resolver":"https://pith.science/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA","bundle":"https://pith.science/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/bundle.json","state":"https://pith.science/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4ZFLQT3JCCVZLBNJHAXYJZL2OA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:4ZFLQT3JCCVZLBNJHAXYJZL2OA","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":"2f20436b8390ff51ac4137c88418eb2f1456b27cc8fc329df3a6908c5da8495d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-13T15:39:43Z","title_canon_sha256":"367ab3ed231ff885186521d636983e29de51134c93ac535dcdd179efdf4b28dc"},"schema_version":"1.0","source":{"id":"1401.2876","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.2876","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"arxiv_version","alias_value":"1401.2876v1","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.2876","created_at":"2026-05-18T01:45:26Z"},{"alias_kind":"pith_short_12","alias_value":"4ZFLQT3JCCVZ","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"4ZFLQT3JCCVZLBNJ","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"4ZFLQT3J","created_at":"2026-05-18T12:28:14Z"}],"graph_snapshots":[{"event_id":"sha256:145d39f6a4e537c9e09bb575b6f4a30e73b00190039582a635f738cee0685a2d","target":"graph","created_at":"2026-05-18T01:45:26Z","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 present the first detection of carbon radio recombination line absorption along the line of sight to Cygnus A. The observations were carried out with the LOw Frequency ARray in the 33 to 57 MHz range. These low frequency radio observations provide us with a new line of sight to study the diffuse, neutral gas in our Galaxy. To our knowledge this is the first time that foreground Milky Way recombination line absorption has been observed against a bright extragalactic background source.\n  By stacking 48 carbon $\\alpha$ lines in the observed frequency range we detect carbon absorption with a si","authors_text":"A. Alexov, A. Asgekar, A. Bonafede, A. Corstanje, A.G.G.M. Tielens, A.G. Polatidis, A. Horneffer, A. Karastergiou, A.M.M. Scaife, A. Schoenmakers, A. Shulevski, A. van der Horst, A.Zensus, B. Ciardi, B.W. Stappers, C. Ferrari, C. Sobey, C. Tasse, C. Toribio, C. Vocks, C. Vogt, D.D. Mulcahy, D. Engels, D. Schwarz, E. de Geus, E. Juette, E. Orru, F. Batejat, F. Breitling, F. De Gasperin, F. Salgado, G. Bernardi, G. Heald, G.J. White, G. Kuper, G. Macario, G. Mann, H. Falcke, H.J.A. Rottgering, H. Munk, H. Paas, H.R. Butcher, I.M. Avruch, I. van Bemmel, J. Anderson, J. Broderick, J.B.R. Oonk, J.C.A. Miller-Jones, J.D. Mol, J.E. Conway, J. Eisloeffel, J. Griessmeier, J. Kohler, J.P. Hamaker, J.P. McKean, J. Sluman, J. Swinbank, J. van Enst, J. van Leeuwen, J.W.T. Hessels, L.K. Morabito, M.A. Garrett, M. Brentjens, M. Brueggen, M. de Vos, M.E. Bell, M. Hoeft, M. Iacobelli, M.J. Bentum, M.J. Norden, M. Kramer, M. Kuniyoshi, M. Mevius, M. Pandey-Pommier, M. Steinmetz, M. Tagger, M.W. Wise, N.J. Jackson, O. Smirnov, O. Wucknitz, P. Best, P. Maat, P. Zarka, R.A. Fallows, R.A.M.J. Wijers, R. Beck, R. Fender, R.J. van Weeren, R. Pizzo, R. van Nieuwpoort, R. Vermeulen, S. Duscha, S. Markoff, S. ter Veen, S. Thoudam, S. Yatawatta, T.E. Hassall, V.I. Kondratiev, V. N. Pandey, W. Frieswijk, W. Klijn, W. Reich, Y. Tang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-13T15:39:43Z","title":"Discovery of Carbon Radio Recombination Lines in absorption towards Cygnus~A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.2876","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":"sha256:8052aa6645a9f81443319b0117f38ffedb2c405ca45a9fa0c327d709805b7436","target":"record","created_at":"2026-05-18T01:45:26Z","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":"2f20436b8390ff51ac4137c88418eb2f1456b27cc8fc329df3a6908c5da8495d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-13T15:39:43Z","title_canon_sha256":"367ab3ed231ff885186521d636983e29de51134c93ac535dcdd179efdf4b28dc"},"schema_version":"1.0","source":{"id":"1401.2876","kind":"arxiv","version":1}},"canonical_sha256":"e64ab84f6910ab9585a9382f84e57a701b2b541de03cf7b402f43f036a497a2a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e64ab84f6910ab9585a9382f84e57a701b2b541de03cf7b402f43f036a497a2a","first_computed_at":"2026-05-18T01:45:26.167871Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:45:26.167871Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+sqKGSVbrWnCUUDZQ7u20/nxvZ1jv9inZSr9fJUyobI9gVkiyCRQsmRsX171/LuYO2GgfL9mHUN4T4Ja5wlHAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:45:26.168355Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.2876","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8052aa6645a9f81443319b0117f38ffedb2c405ca45a9fa0c327d709805b7436","sha256:145d39f6a4e537c9e09bb575b6f4a30e73b00190039582a635f738cee0685a2d"],"state_sha256":"93a44ce968dedad96cd3535ade7e8680665270cebb42211f34c85a911d71992a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6YiuOp2TdD21mpslCXCvdF+nQLBvyZNmyl+p83S06HZVqFPA0R73mcYjT/imz9hP7lHVGUiqXITqVivUJ15QDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T23:47:30.049601Z","bundle_sha256":"2407220aef1fed881dcadfbc5c6eb4ea7d0d6948d86535405252464c313db8f2"}}