{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:4FHNKRMYTV5MQQZWMPIPEGYQRH","short_pith_number":"pith:4FHNKRMY","schema_version":"1.0","canonical_sha256":"e14ed545989d7ac8433663d0f21b1089e8169eca7bc2d37ebbf415786f56f981","source":{"kind":"arxiv","id":"1106.4498","version":1},"attestation_state":"computed","paper":{"title":"Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A.K. Carlton, D.A. Green, K.J. Borkowski, K. Krishnamurthy, R. Petre, R. Willett, S.P. Reynolds, U. Hwang","submitted_at":"2011-06-22T16:47:18Z","abstract_excerpt":"We present a measurement of the expansion and brightening of G1.9+0.3, the youngest Galactic supernova remnant, comparing Chandra X-ray images obtained in 2007 and 2009. A simple uniform expansion model describes the data well, giving an expansion rate of 0.642 +/- 0.049 % yr^-1, and a flux increase of 1.7 +/- 1.0 % yr^-1. Without deceleration, the remnant age would then be 156 +/- 11 yr, consistent with earlier results. Since deceleration must have occurred, this age is an upper limit; we estimate an age of about 110 yr, or an explosion date of about 1900. The flux increase is comparable to r"},"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":"1106.4498","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-06-22T16:47:18Z","cross_cats_sorted":[],"title_canon_sha256":"37686d2f121959bbb8b42974ae3ecf74b4d33e36c84c1f297e39f61f477cd80e","abstract_canon_sha256":"610ed5bdeacb7d898fdd88ed783327c99f1aa79a4ea818af66be618f8b9ac2ed"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:31.963029Z","signature_b64":"ntPdw1KYGHZDxSOHRRYnE7o2qI8qb/SP+do9o0k5xae8XECnXj9mRHjeJKbzxljkhoZj7NgiyHBAYfqnnb+ZAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e14ed545989d7ac8433663d0f21b1089e8169eca7bc2d37ebbf415786f56f981","last_reissued_at":"2026-05-18T02:01:31.962625Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:31.962625Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A.K. Carlton, D.A. Green, K.J. Borkowski, K. Krishnamurthy, R. Petre, R. Willett, S.P. Reynolds, U. Hwang","submitted_at":"2011-06-22T16:47:18Z","abstract_excerpt":"We present a measurement of the expansion and brightening of G1.9+0.3, the youngest Galactic supernova remnant, comparing Chandra X-ray images obtained in 2007 and 2009. A simple uniform expansion model describes the data well, giving an expansion rate of 0.642 +/- 0.049 % yr^-1, and a flux increase of 1.7 +/- 1.0 % yr^-1. Without deceleration, the remnant age would then be 156 +/- 11 yr, consistent with earlier results. Since deceleration must have occurred, this age is an upper limit; we estimate an age of about 110 yr, or an explosion date of about 1900. The flux increase is comparable to r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.4498","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1106.4498","created_at":"2026-05-18T02:01:31.962681+00:00"},{"alias_kind":"arxiv_version","alias_value":"1106.4498v1","created_at":"2026-05-18T02:01:31.962681+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.4498","created_at":"2026-05-18T02:01:31.962681+00:00"},{"alias_kind":"pith_short_12","alias_value":"4FHNKRMYTV5M","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_16","alias_value":"4FHNKRMYTV5MQQZW","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_8","alias_value":"4FHNKRMY","created_at":"2026-05-18T12:26:20.644004+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH","json":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH.json","graph_json":"https://pith.science/api/pith-number/4FHNKRMYTV5MQQZWMPIPEGYQRH/graph.json","events_json":"https://pith.science/api/pith-number/4FHNKRMYTV5MQQZWMPIPEGYQRH/events.json","paper":"https://pith.science/paper/4FHNKRMY"},"agent_actions":{"view_html":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH","download_json":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH.json","view_paper":"https://pith.science/paper/4FHNKRMY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1106.4498&json=true","fetch_graph":"https://pith.science/api/pith-number/4FHNKRMYTV5MQQZWMPIPEGYQRH/graph.json","fetch_events":"https://pith.science/api/pith-number/4FHNKRMYTV5MQQZWMPIPEGYQRH/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH/action/storage_attestation","attest_author":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH/action/author_attestation","sign_citation":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH/action/citation_signature","submit_replication":"https://pith.science/pith/4FHNKRMYTV5MQQZWMPIPEGYQRH/action/replication_record"}},"created_at":"2026-05-18T02:01:31.962681+00:00","updated_at":"2026-05-18T02:01:31.962681+00:00"}