{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2002:RAHHZEU35KMBU2TVTJXCWSFLVG","short_pith_number":"pith:RAHHZEU3","schema_version":"1.0","canonical_sha256":"880e7c929bea981a6a759a6e2b48aba99640d68134fbb233bfa462ff54dcad5f","source":{"kind":"arxiv","id":"astro-ph/0212389","version":1},"attestation_state":"computed","paper":{"title":"X-ray Spectroscopy and Variability of AGN Detected in the 2 Ms Chandra Deep Field-North Survey","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.E. Hornschemeier, C. Vignali, D.M. Alexander, D.P. Schneider (Pennsylvania State University), F.E. Bauer, G.P. Garmire, L.K. Townsley, P.S. Broos, W.N. Brandt","submitted_at":"2002-12-17T23:15:26Z","abstract_excerpt":"We investigate the nature of the faint X-ray source population through X-ray spectroscopy and variability analyses of 136 AGN detected in the 2 Ms Chandra Deep Field-North survey with > 200 background-subtracted 0.5-8.0 keV counts [F(0.5-8.0 keV)=(1.4-200)e-15 erg cm^{-2} s^{-1}]. Our preliminary spectral analyses yield median spectral parameters of Gamma=1.61 and intrinsic N_H=6.2e21 cm^{-2} (z=1 assumed when no redshift available) when the AGN spectra are fitted with a simple absorbed power-law model. However, considerable spectral complexity is apparent (e.g., reflection, partial covering) "},"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":"astro-ph/0212389","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-12-17T23:15:26Z","cross_cats_sorted":[],"title_canon_sha256":"b14628557970069e41114730fe8bf04f938535f0fc649716872e006e900c1ad0","abstract_canon_sha256":"6d570ffb6852e365e498b2fda7890097f5a530e36165565891e56c249f915343"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:34.305298Z","signature_b64":"KEZNRTIX4CPbx9jLmnBdKak2HTcOFhuIgn50Lxf5j7CPNJTRBVgBxwkYHaJuv8Su05MEL4xjBgn4kp6YudOBCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"880e7c929bea981a6a759a6e2b48aba99640d68134fbb233bfa462ff54dcad5f","last_reissued_at":"2026-05-17T23:49:34.304696Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:34.304696Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"X-ray Spectroscopy and Variability of AGN Detected in the 2 Ms Chandra Deep Field-North Survey","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.E. Hornschemeier, C. Vignali, D.M. Alexander, D.P. Schneider (Pennsylvania State University), F.E. Bauer, G.P. Garmire, L.K. Townsley, P.S. Broos, W.N. Brandt","submitted_at":"2002-12-17T23:15:26Z","abstract_excerpt":"We investigate the nature of the faint X-ray source population through X-ray spectroscopy and variability analyses of 136 AGN detected in the 2 Ms Chandra Deep Field-North survey with > 200 background-subtracted 0.5-8.0 keV counts [F(0.5-8.0 keV)=(1.4-200)e-15 erg cm^{-2} s^{-1}]. Our preliminary spectral analyses yield median spectral parameters of Gamma=1.61 and intrinsic N_H=6.2e21 cm^{-2} (z=1 assumed when no redshift available) when the AGN spectra are fitted with a simple absorbed power-law model. However, considerable spectral complexity is apparent (e.g., reflection, partial covering) "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0212389","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":"astro-ph/0212389","created_at":"2026-05-17T23:49:34.304789+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0212389v1","created_at":"2026-05-17T23:49:34.304789+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0212389","created_at":"2026-05-17T23:49:34.304789+00:00"},{"alias_kind":"pith_short_12","alias_value":"RAHHZEU35KMB","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_16","alias_value":"RAHHZEU35KMBU2TV","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_8","alias_value":"RAHHZEU3","created_at":"2026-05-18T12:25:51.375804+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/RAHHZEU35KMBU2TVTJXCWSFLVG","json":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG.json","graph_json":"https://pith.science/api/pith-number/RAHHZEU35KMBU2TVTJXCWSFLVG/graph.json","events_json":"https://pith.science/api/pith-number/RAHHZEU35KMBU2TVTJXCWSFLVG/events.json","paper":"https://pith.science/paper/RAHHZEU3"},"agent_actions":{"view_html":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG","download_json":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG.json","view_paper":"https://pith.science/paper/RAHHZEU3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0212389&json=true","fetch_graph":"https://pith.science/api/pith-number/RAHHZEU35KMBU2TVTJXCWSFLVG/graph.json","fetch_events":"https://pith.science/api/pith-number/RAHHZEU35KMBU2TVTJXCWSFLVG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG/action/storage_attestation","attest_author":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG/action/author_attestation","sign_citation":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG/action/citation_signature","submit_replication":"https://pith.science/pith/RAHHZEU35KMBU2TVTJXCWSFLVG/action/replication_record"}},"created_at":"2026-05-17T23:49:34.304789+00:00","updated_at":"2026-05-17T23:49:34.304789+00:00"}