{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2002:MNJCS5GV7SGGGRWLBV5Q6WVKH6","short_pith_number":"pith:MNJCS5GV","schema_version":"1.0","canonical_sha256":"63522974d5fc8c6346cb0d7b0f5aaa3fa3dc5736acfa0ca01545c7ee42cb5c61","source":{"kind":"arxiv","id":"astro-ph/0206264","version":1},"attestation_state":"computed","paper":{"title":"Chandra Detection of OVIII Ly-alpha Absorption from an Overdense Region in the Intergalactic Medium","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. R. Canizares (MIT), D. S. Davis, H. L. Marshall, J. C. Lee, T. Fang","submitted_at":"2002-06-16T19:04:05Z","abstract_excerpt":"We report the first detection of an OVIII Ly-alpha absorption line associated with an overdense region in the intergalactic medium (IGM) along the sightline towards PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETGS). The absorption line is detected at 4.5 sigma level with cz~16,600 km/s. At the same velocity Shull et al.(1998) detected a small group of spiral galaxies (with an overdensity of delta_gal ~ 100) and low metallicity HI Ly-alpha clouds. We constrain the intragroup gas that gives rise to the OVIII Ly-alpha line to a baryon density in the range 1e-5 < n"},"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/0206264","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-06-16T19:04:05Z","cross_cats_sorted":[],"title_canon_sha256":"e2d667f3d557cd7f84601a41a56e5ae5d62635f3588bfa1d76333ddead3ea345","abstract_canon_sha256":"d87afd4db2a469ec5e5317872ace2f4e13579c8d8688d6ed389ee6102e8d1215"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:42.640797Z","signature_b64":"J8vUIB2ouMsetSfh/L0WxCasTyhHxo0OKpjLPQMMANYypLlWx2IPnBU7oUH4xvqe5UeHKRydsSziEuKKHmIrBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63522974d5fc8c6346cb0d7b0f5aaa3fa3dc5736acfa0ca01545c7ee42cb5c61","last_reissued_at":"2026-05-18T01:40:42.639881Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:42.639881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Chandra Detection of OVIII Ly-alpha Absorption from an Overdense Region in the Intergalactic Medium","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. R. Canizares (MIT), D. S. Davis, H. L. Marshall, J. C. Lee, T. Fang","submitted_at":"2002-06-16T19:04:05Z","abstract_excerpt":"We report the first detection of an OVIII Ly-alpha absorption line associated with an overdense region in the intergalactic medium (IGM) along the sightline towards PKS 2155-304 with the Chandra Low Energy Transmission Grating Spectrometer (LETGS). The absorption line is detected at 4.5 sigma level with cz~16,600 km/s. At the same velocity Shull et al.(1998) detected a small group of spiral galaxies (with an overdensity of delta_gal ~ 100) and low metallicity HI Ly-alpha clouds. We constrain the intragroup gas that gives rise to the OVIII Ly-alpha line to a baryon density in the range 1e-5 < n"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0206264","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/0206264","created_at":"2026-05-18T01:40:42.640013+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0206264v1","created_at":"2026-05-18T01:40:42.640013+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0206264","created_at":"2026-05-18T01:40:42.640013+00:00"},{"alias_kind":"pith_short_12","alias_value":"MNJCS5GV7SGG","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_16","alias_value":"MNJCS5GV7SGGGRWL","created_at":"2026-05-18T12:25:51.375804+00:00"},{"alias_kind":"pith_short_8","alias_value":"MNJCS5GV","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/MNJCS5GV7SGGGRWLBV5Q6WVKH6","json":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6.json","graph_json":"https://pith.science/api/pith-number/MNJCS5GV7SGGGRWLBV5Q6WVKH6/graph.json","events_json":"https://pith.science/api/pith-number/MNJCS5GV7SGGGRWLBV5Q6WVKH6/events.json","paper":"https://pith.science/paper/MNJCS5GV"},"agent_actions":{"view_html":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6","download_json":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6.json","view_paper":"https://pith.science/paper/MNJCS5GV","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0206264&json=true","fetch_graph":"https://pith.science/api/pith-number/MNJCS5GV7SGGGRWLBV5Q6WVKH6/graph.json","fetch_events":"https://pith.science/api/pith-number/MNJCS5GV7SGGGRWLBV5Q6WVKH6/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6/action/storage_attestation","attest_author":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6/action/author_attestation","sign_citation":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6/action/citation_signature","submit_replication":"https://pith.science/pith/MNJCS5GV7SGGGRWLBV5Q6WVKH6/action/replication_record"}},"created_at":"2026-05-18T01:40:42.640013+00:00","updated_at":"2026-05-18T01:40:42.640013+00:00"}