{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1999:SHDABQHAVFVI4WJS6KKLSAY7A5","short_pith_number":"pith:SHDABQHA","canonical_record":{"source":{"id":"astro-ph/9905188","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-14T18:16:20Z","cross_cats_sorted":[],"title_canon_sha256":"7c8b0e3d094928e79d89abc4fc038bc500cdadb7d8261394cc87f95616bc69b6","abstract_canon_sha256":"707574c542068b4194ff32dd0bf35db2e3913292f3f30d4a5ec9122195991018"},"schema_version":"1.0"},"canonical_sha256":"91c600c0e0a96a8e5932f294b9031f075de2eae6aa340801e3687ccf33e1607c","source":{"kind":"arxiv","id":"astro-ph/9905188","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9905188","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9905188v1","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9905188","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_12","alias_value":"SHDABQHAVFVI","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_16","alias_value":"SHDABQHAVFVI4WJS","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_8","alias_value":"SHDABQHA","created_at":"2026-07-04T16:11:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1999:SHDABQHAVFVI4WJS6KKLSAY7A5","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9905188","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-14T18:16:20Z","cross_cats_sorted":[],"title_canon_sha256":"7c8b0e3d094928e79d89abc4fc038bc500cdadb7d8261394cc87f95616bc69b6","abstract_canon_sha256":"707574c542068b4194ff32dd0bf35db2e3913292f3f30d4a5ec9122195991018"},"schema_version":"1.0"},"canonical_sha256":"91c600c0e0a96a8e5932f294b9031f075de2eae6aa340801e3687ccf33e1607c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:11:13.007915Z","signature_b64":"Onvd7YmuIpx7rGf1Qbd+i7L2da6IMWdHlhBASHuzcajIwEI1oYznC7x9Zwzp0Ql/cUQo8X6XEtN+em+loNkPDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"91c600c0e0a96a8e5932f294b9031f075de2eae6aa340801e3687ccf33e1607c","last_reissued_at":"2026-07-04T16:11:13.007455Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:11:13.007455Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9905188","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:11:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bzov08HLqKKuNry9NKBCNzALMW57qh0xC8qCJ+O8ZqwM2m6dxM9JZhFbIF0MSk7T7xOYl+FGoO1m3WH69ccWAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T07:49:20.582497Z"},"content_sha256":"05eac37f2130ca2156ff844d6a588044622f220101ad9c2175aff198e7b6ac83","schema_version":"1.0","event_id":"sha256:05eac37f2130ca2156ff844d6a588044622f220101ad9c2175aff198e7b6ac83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1999:SHDABQHAVFVI4WJS6KKLSAY7A5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray Spectra of the RIXOS source sample","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. Wonnacott, E. Romero-Colmenero, F.J. Carrera, G. Hasinger, H. Andernach, J. Burgos-Martin, J. I. Gonzalez-Serrano, J. P. D. Mittaz, K. O. Mason, R. Bower, R. McMahon","submitted_at":"1999-05-14T18:16:20Z","abstract_excerpt":"We present results of an extensive study of the X-ray spectral properties of sources detected in the RIXOS survey, that is nearly complete down to a flux limit of 3e-14 cgs (0.5-2 keV). We show that for X-ray surveys containing sources with low count rate spectral slopes estimated using simple hardness ratios in the ROSAT band can be biased. Instead we analyse three-colour X-ray data using statistical techniques appropriate to the Poisson regime which removes the effects of this bias. We have then applied this technique to the RIXOS survey to study the spectral properties of the sample. For th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9905188","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9905188/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:11:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z32vapJ61uskrqeOTAcJiteDbpy/nG0xfUUlBSW37LZuzrfgCpcBFJIruKC4qwd1PkHKXSR//WjTmvbFec4rCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T07:49:20.583058Z"},"content_sha256":"5d7454bf0edb9c5d4df8f6e75edb10a81b7bbde6bc2d440cd6c011e9cad7fd4c","schema_version":"1.0","event_id":"sha256:5d7454bf0edb9c5d4df8f6e75edb10a81b7bbde6bc2d440cd6c011e9cad7fd4c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/bundle.json","state_url":"https://pith.science/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-06T07:49:20Z","links":{"resolver":"https://pith.science/pith/SHDABQHAVFVI4WJS6KKLSAY7A5","bundle":"https://pith.science/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/bundle.json","state":"https://pith.science/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SHDABQHAVFVI4WJS6KKLSAY7A5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:SHDABQHAVFVI4WJS6KKLSAY7A5","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"707574c542068b4194ff32dd0bf35db2e3913292f3f30d4a5ec9122195991018","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-14T18:16:20Z","title_canon_sha256":"7c8b0e3d094928e79d89abc4fc038bc500cdadb7d8261394cc87f95616bc69b6"},"schema_version":"1.0","source":{"id":"astro-ph/9905188","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9905188","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9905188v1","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9905188","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_12","alias_value":"SHDABQHAVFVI","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_16","alias_value":"SHDABQHAVFVI4WJS","created_at":"2026-07-04T16:11:13Z"},{"alias_kind":"pith_short_8","alias_value":"SHDABQHA","created_at":"2026-07-04T16:11:13Z"}],"graph_snapshots":[{"event_id":"sha256:5d7454bf0edb9c5d4df8f6e75edb10a81b7bbde6bc2d440cd6c011e9cad7fd4c","target":"graph","created_at":"2026-07-04T16:11:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/9905188/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present results of an extensive study of the X-ray spectral properties of sources detected in the RIXOS survey, that is nearly complete down to a flux limit of 3e-14 cgs (0.5-2 keV). We show that for X-ray surveys containing sources with low count rate spectral slopes estimated using simple hardness ratios in the ROSAT band can be biased. Instead we analyse three-colour X-ray data using statistical techniques appropriate to the Poisson regime which removes the effects of this bias. We have then applied this technique to the RIXOS survey to study the spectral properties of the sample. For th","authors_text":"D. Wonnacott, E. Romero-Colmenero, F.J. Carrera, G. Hasinger, H. Andernach, J. Burgos-Martin, J. I. Gonzalez-Serrano, J. P. D. Mittaz, K. O. Mason, R. Bower, R. McMahon","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-05-14T18:16:20Z","title":"X-ray Spectra of the RIXOS source sample"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9905188","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:05eac37f2130ca2156ff844d6a588044622f220101ad9c2175aff198e7b6ac83","target":"record","created_at":"2026-07-04T16:11:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"707574c542068b4194ff32dd0bf35db2e3913292f3f30d4a5ec9122195991018","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-14T18:16:20Z","title_canon_sha256":"7c8b0e3d094928e79d89abc4fc038bc500cdadb7d8261394cc87f95616bc69b6"},"schema_version":"1.0","source":{"id":"astro-ph/9905188","kind":"arxiv","version":1}},"canonical_sha256":"91c600c0e0a96a8e5932f294b9031f075de2eae6aa340801e3687ccf33e1607c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"91c600c0e0a96a8e5932f294b9031f075de2eae6aa340801e3687ccf33e1607c","first_computed_at":"2026-07-04T16:11:13.007455Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:11:13.007455Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Onvd7YmuIpx7rGf1Qbd+i7L2da6IMWdHlhBASHuzcajIwEI1oYznC7x9Zwzp0Ql/cUQo8X6XEtN+em+loNkPDA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:11:13.007915Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9905188","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05eac37f2130ca2156ff844d6a588044622f220101ad9c2175aff198e7b6ac83","sha256:5d7454bf0edb9c5d4df8f6e75edb10a81b7bbde6bc2d440cd6c011e9cad7fd4c"],"state_sha256":"d017b8e15d2d114d114908f06784e96452dfa733f9efe7ca8ff69d2c36844e8c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l1Zmqfi4PEkSCdQZKHg3NKqcLazK3reaJmTlbYCWY3EDflfuK0XpUUj6U3JbBEfXAyP/mp3C13Ejw9YyIMwMBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T07:49:20.586591Z","bundle_sha256":"88e8e173708d128e8fef56856edd58f972b230ddfd8787c33829d2602144b943"}}