{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:ZAACP2YE2AT7RXYGXR5DS3LHCU","short_pith_number":"pith:ZAACP2YE","schema_version":"1.0","canonical_sha256":"c80027eb04d027f8df06bc7a396d6715182e098fb1b2193f54378b6cf9801fda","source":{"kind":"arxiv","id":"1803.09892","version":2},"attestation_state":"computed","paper":{"title":"A {\\it Chandra} Survey of Milky Way Globular Clusters I: Emissivity and Abundance of Weak X-ray Sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Xiangdong Li, Xiaojie Xu, Zhiyuan Li, Zhongqun Cheng","submitted_at":"2018-03-27T04:28:19Z","abstract_excerpt":"Based on archival {\\it Chandra} data, we have carried out an X-ray survey of 69, or nearly half the known population of, Milky Way globular clusters (GCs), focusing on weak X-ray sources, mainly cataclysmic variables (CVs) and coronally active binaries (ABs). Using the cumulative X-ray luminosity per unit stellar mass (i.e., X-ray emissivity) as a proxy of the source abundance, we demonstrate a paucity (lower by $41\\%\\pm27\\%$ on average) of weak X-ray sources in most GCs relative to the field, which is represented by the Solar neighborhood and Local Group dwarf elliptical galaxies. We also rev"},"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":"1803.09892","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-03-27T04:28:19Z","cross_cats_sorted":[],"title_canon_sha256":"90dda31a79eef691237cd0514d5f94023ea67054b35f03c2b6ba5b7140f4b880","abstract_canon_sha256":"6761ed45249a313b7a2f6adfc7c544eed966ed0b924a8971a49fdd53d1944175"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:54.976429Z","signature_b64":"UCkscw78xhPKIhjTqpPKOu6jwgxCCr56ns3QEnQFSTZZ9cXgPsAIxleW68cHKfIYCJLWH5MBfwC/EjLuAAyFDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c80027eb04d027f8df06bc7a396d6715182e098fb1b2193f54378b6cf9801fda","last_reissued_at":"2026-05-18T00:15:54.975641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:54.975641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A {\\it Chandra} Survey of Milky Way Globular Clusters I: Emissivity and Abundance of Weak X-ray Sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Xiangdong Li, Xiaojie Xu, Zhiyuan Li, Zhongqun Cheng","submitted_at":"2018-03-27T04:28:19Z","abstract_excerpt":"Based on archival {\\it Chandra} data, we have carried out an X-ray survey of 69, or nearly half the known population of, Milky Way globular clusters (GCs), focusing on weak X-ray sources, mainly cataclysmic variables (CVs) and coronally active binaries (ABs). Using the cumulative X-ray luminosity per unit stellar mass (i.e., X-ray emissivity) as a proxy of the source abundance, we demonstrate a paucity (lower by $41\\%\\pm27\\%$ on average) of weak X-ray sources in most GCs relative to the field, which is represented by the Solar neighborhood and Local Group dwarf elliptical galaxies. We also rev"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.09892","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":"1803.09892","created_at":"2026-05-18T00:15:54.975775+00:00"},{"alias_kind":"arxiv_version","alias_value":"1803.09892v2","created_at":"2026-05-18T00:15:54.975775+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.09892","created_at":"2026-05-18T00:15:54.975775+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZAACP2YE2AT7","created_at":"2026-05-18T12:33:04.347982+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZAACP2YE2AT7RXYG","created_at":"2026-05-18T12:33:04.347982+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZAACP2YE","created_at":"2026-05-18T12:33:04.347982+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/ZAACP2YE2AT7RXYGXR5DS3LHCU","json":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU.json","graph_json":"https://pith.science/api/pith-number/ZAACP2YE2AT7RXYGXR5DS3LHCU/graph.json","events_json":"https://pith.science/api/pith-number/ZAACP2YE2AT7RXYGXR5DS3LHCU/events.json","paper":"https://pith.science/paper/ZAACP2YE"},"agent_actions":{"view_html":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU","download_json":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU.json","view_paper":"https://pith.science/paper/ZAACP2YE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1803.09892&json=true","fetch_graph":"https://pith.science/api/pith-number/ZAACP2YE2AT7RXYGXR5DS3LHCU/graph.json","fetch_events":"https://pith.science/api/pith-number/ZAACP2YE2AT7RXYGXR5DS3LHCU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU/action/storage_attestation","attest_author":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU/action/author_attestation","sign_citation":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU/action/citation_signature","submit_replication":"https://pith.science/pith/ZAACP2YE2AT7RXYGXR5DS3LHCU/action/replication_record"}},"created_at":"2026-05-18T00:15:54.975775+00:00","updated_at":"2026-05-18T00:15:54.975775+00:00"}