{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:UWDZ37MRFSIIFGYKOU7MXRXQLJ","short_pith_number":"pith:UWDZ37MR","schema_version":"1.0","canonical_sha256":"a5879dfd912c90829b0a753ecbc6f05a50764337ad1ccce5644db7fc01e3699c","source":{"kind":"arxiv","id":"0911.0093","version":2},"attestation_state":"computed","paper":{"title":"Spin-down Measurement of PSR J1852+0040 in Kesteven 79: Central Compact Objects as Anti-Magnetars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"E. V. Gotthelf, J. P. Halpern","submitted_at":"2009-10-31T16:31:15Z","abstract_excerpt":"Using XMM-Newton and Chandra, we achieved phase-connected timing of the 105 ms X-ray pulsar PSR J1852+0040 that provides the first measurement of the spin-down rate of a member of the class of Central Compact Objects (CCOs) in supernova remnants. We measure P-dot = 8.68(9)E-18, and find no evidence for timing noise or variations in X-ray flux over 4.8 yr. In the dipole spin-down formalism, this implies a surface magnetic field strength B_s = 3.1E10 G, the smallest ever measured for a young neutron star, and consistent with being a fossil field. In combination with upper limits on B_s from othe"},"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":"0911.0093","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-10-31T16:31:15Z","cross_cats_sorted":[],"title_canon_sha256":"e42b66ad25527aba8e29d36fa45446bc4d6c853c7546c1f441b25348c56df4cc","abstract_canon_sha256":"ad59a7f261ca314fa39c9c558d3df21b23fb7b09eb387950b3a2e39808a3ef81"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:12.315691Z","signature_b64":"2swrg+Tq/Yf58kD3AepjDArlUmLTC8LtXJEGKysfunpXSyaWc6wDrCAX/0k8dXY2T9H4SCg3eggM6/LXp8GJDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5879dfd912c90829b0a753ecbc6f05a50764337ad1ccce5644db7fc01e3699c","last_reissued_at":"2026-05-18T02:34:12.315292Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:12.315292Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spin-down Measurement of PSR J1852+0040 in Kesteven 79: Central Compact Objects as Anti-Magnetars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"E. V. Gotthelf, J. P. Halpern","submitted_at":"2009-10-31T16:31:15Z","abstract_excerpt":"Using XMM-Newton and Chandra, we achieved phase-connected timing of the 105 ms X-ray pulsar PSR J1852+0040 that provides the first measurement of the spin-down rate of a member of the class of Central Compact Objects (CCOs) in supernova remnants. We measure P-dot = 8.68(9)E-18, and find no evidence for timing noise or variations in X-ray flux over 4.8 yr. In the dipole spin-down formalism, this implies a surface magnetic field strength B_s = 3.1E10 G, the smallest ever measured for a young neutron star, and consistent with being a fossil field. In combination with upper limits on B_s from othe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.0093","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0911.0093","created_at":"2026-05-18T02:34:12.315364+00:00"},{"alias_kind":"arxiv_version","alias_value":"0911.0093v2","created_at":"2026-05-18T02:34:12.315364+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.0093","created_at":"2026-05-18T02:34:12.315364+00:00"},{"alias_kind":"pith_short_12","alias_value":"UWDZ37MRFSII","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_16","alias_value":"UWDZ37MRFSIIFGYK","created_at":"2026-05-18T12:26:02.257875+00:00"},{"alias_kind":"pith_short_8","alias_value":"UWDZ37MR","created_at":"2026-05-18T12:26:02.257875+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2512.17214","citing_title":"Pulsed radio emission from a Central Compact Object","ref_index":13,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ","json":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ.json","graph_json":"https://pith.science/api/pith-number/UWDZ37MRFSIIFGYKOU7MXRXQLJ/graph.json","events_json":"https://pith.science/api/pith-number/UWDZ37MRFSIIFGYKOU7MXRXQLJ/events.json","paper":"https://pith.science/paper/UWDZ37MR"},"agent_actions":{"view_html":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ","download_json":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ.json","view_paper":"https://pith.science/paper/UWDZ37MR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0911.0093&json=true","fetch_graph":"https://pith.science/api/pith-number/UWDZ37MRFSIIFGYKOU7MXRXQLJ/graph.json","fetch_events":"https://pith.science/api/pith-number/UWDZ37MRFSIIFGYKOU7MXRXQLJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ/action/storage_attestation","attest_author":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ/action/author_attestation","sign_citation":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ/action/citation_signature","submit_replication":"https://pith.science/pith/UWDZ37MRFSIIFGYKOU7MXRXQLJ/action/replication_record"}},"created_at":"2026-05-18T02:34:12.315364+00:00","updated_at":"2026-05-18T02:34:12.315364+00:00"}