{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2022:3ERJIIC543T7NSA5LIJFSHDZPE","short_pith_number":"pith:3ERJIIC5","schema_version":"1.0","canonical_sha256":"d92294205de6e7f6c81d5a12591c79792b436784f622043f7049866a73cf1a81","source":{"kind":"arxiv","id":"2207.13096","version":1},"attestation_state":"computed","paper":{"title":"Identifying active galactic nuclei via brightness temperature with sub-arcsecond International LOFAR Telescope observations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"F. Sweijen, G. Calistro Rivera, Isabella Prandoni, J. E. Conway, J. F. Radcliffe, K. J. Duncan, Leah K. Morabito, Marco Bondi, Matteo Bonato, P.N. Best, R.J. van Weeren, Rohit Kondapally, T. W. Shimwell, W. L. Williams","submitted_at":"2022-07-26T18:00:00Z","abstract_excerpt":"Identifying active galactic nuclei (AGN) and isolating their contribution to a galaxy's energy budget is crucial for studying the co-evolution of AGN and their host galaxies. Brightness temperature ($T_b$) measurements from high-resolution radio observations at GHz frequencies are widely used to identify AGN. Here we investigate using new sub-arcsecond imaging at 144 MHz with the International LOFAR Telescope to identify AGN using $T_b$ in the Lockman Hole field. We use ancillary data to validate the 940 AGN identifications, finding 83 percent of sources have AGN classifications from SED fitti"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2207.13096","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2022-07-26T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"2e1f452a54691e9bee70e164a8d099035d8aef2c2985ae6f737c74cc5694d27e","abstract_canon_sha256":"f4f6d1c6916a7184f227ee62d82267a773951acad35fe7bd1b8f017f47083c2d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:49:01.325898Z","signature_b64":"Wc2cT6aWzWyag3FKCEbVgJmPqMWjfZTSn8GuH9SGXq34Yth9v0WYrX0tvYS8daUoCduOfw5T0J6u5pHzhvLkCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d92294205de6e7f6c81d5a12591c79792b436784f622043f7049866a73cf1a81","last_reissued_at":"2026-07-05T04:49:01.325352Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:49:01.325352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Identifying active galactic nuclei via brightness temperature with sub-arcsecond International LOFAR Telescope observations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"F. Sweijen, G. Calistro Rivera, Isabella Prandoni, J. E. Conway, J. F. Radcliffe, K. J. Duncan, Leah K. Morabito, Marco Bondi, Matteo Bonato, P.N. Best, R.J. van Weeren, Rohit Kondapally, T. W. Shimwell, W. L. Williams","submitted_at":"2022-07-26T18:00:00Z","abstract_excerpt":"Identifying active galactic nuclei (AGN) and isolating their contribution to a galaxy's energy budget is crucial for studying the co-evolution of AGN and their host galaxies. Brightness temperature ($T_b$) measurements from high-resolution radio observations at GHz frequencies are widely used to identify AGN. Here we investigate using new sub-arcsecond imaging at 144 MHz with the International LOFAR Telescope to identify AGN using $T_b$ in the Lockman Hole field. We use ancillary data to validate the 940 AGN identifications, finding 83 percent of sources have AGN classifications from SED fitti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.13096","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/2207.13096/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2207.13096","created_at":"2026-07-05T04:49:01.325421+00:00"},{"alias_kind":"arxiv_version","alias_value":"2207.13096v1","created_at":"2026-07-05T04:49:01.325421+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.13096","created_at":"2026-07-05T04:49:01.325421+00:00"},{"alias_kind":"pith_short_12","alias_value":"3ERJIIC543T7","created_at":"2026-07-05T04:49:01.325421+00:00"},{"alias_kind":"pith_short_16","alias_value":"3ERJIIC543T7NSA5","created_at":"2026-07-05T04:49:01.325421+00:00"},{"alias_kind":"pith_short_8","alias_value":"3ERJIIC5","created_at":"2026-07-05T04:49:01.325421+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.07818","citing_title":"The DESI View of the Faint Radio Source Population in LoTSS DR2","ref_index":35,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE","json":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE.json","graph_json":"https://pith.science/api/pith-number/3ERJIIC543T7NSA5LIJFSHDZPE/graph.json","events_json":"https://pith.science/api/pith-number/3ERJIIC543T7NSA5LIJFSHDZPE/events.json","paper":"https://pith.science/paper/3ERJIIC5"},"agent_actions":{"view_html":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE","download_json":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE.json","view_paper":"https://pith.science/paper/3ERJIIC5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2207.13096&json=true","fetch_graph":"https://pith.science/api/pith-number/3ERJIIC543T7NSA5LIJFSHDZPE/graph.json","fetch_events":"https://pith.science/api/pith-number/3ERJIIC543T7NSA5LIJFSHDZPE/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE/action/storage_attestation","attest_author":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE/action/author_attestation","sign_citation":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE/action/citation_signature","submit_replication":"https://pith.science/pith/3ERJIIC543T7NSA5LIJFSHDZPE/action/replication_record"}},"created_at":"2026-07-05T04:49:01.325421+00:00","updated_at":"2026-07-05T04:49:01.325421+00:00"}