{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:G4G2LMBES2KBPXA4QW3G7PP7R5","short_pith_number":"pith:G4G2LMBE","canonical_record":{"source":{"id":"astro-ph/0609701","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-26T09:27:43Z","cross_cats_sorted":[],"title_canon_sha256":"bbd7617ca3d9054779c377d157870e62369bdd0ffeedb20ffee53151fc8d6975","abstract_canon_sha256":"e5b7102edcf207a07e1f0b7a9630f643ad226599d7a82b527d580b6dd6adcb86"},"schema_version":"1.0"},"canonical_sha256":"370da5b024969417dc1c85b66fbdff8f7ab562fb9980f67f01e2ad5569b76ab0","source":{"kind":"arxiv","id":"astro-ph/0609701","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609701","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609701v1","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609701","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"pith_short_12","alias_value":"G4G2LMBES2KB","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"G4G2LMBES2KBPXA4","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"G4G2LMBE","created_at":"2026-05-18T12:25:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:G4G2LMBES2KBPXA4QW3G7PP7R5","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0609701","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-26T09:27:43Z","cross_cats_sorted":[],"title_canon_sha256":"bbd7617ca3d9054779c377d157870e62369bdd0ffeedb20ffee53151fc8d6975","abstract_canon_sha256":"e5b7102edcf207a07e1f0b7a9630f643ad226599d7a82b527d580b6dd6adcb86"},"schema_version":"1.0"},"canonical_sha256":"370da5b024969417dc1c85b66fbdff8f7ab562fb9980f67f01e2ad5569b76ab0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:22.197099Z","signature_b64":"D1f5ibPqeWwae6ws4t1JL7VmPxP2urRTJw/IVhC9zbwPXWjQdu0QrzrMys4lNmytbikhHz92sTr+PCpjusw0BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"370da5b024969417dc1c85b66fbdff8f7ab562fb9980f67f01e2ad5569b76ab0","last_reissued_at":"2026-05-18T01:16:22.196377Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:22.196377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0609701","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":"2026-05-18T01:16:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WxG0owlNjY1ABytDdIqlx7gONihEUSBVfZhV3HSQjOg4VPNbCP/kqTDu7I8HBm+9xb8+cZ+9l0LD1cTHnXcpBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T06:45:05.430220Z"},"content_sha256":"bcb414f48f41a9009c01236f8abcfa556d8b3c5a2962cfaa2124bb92e6f1c38e","schema_version":"1.0","event_id":"sha256:bcb414f48f41a9009c01236f8abcfa556d8b3c5a2962cfaa2124bb92e6f1c38e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:G4G2LMBES2KBPXA4QW3G7PP7R5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Estimating the spectral indices of correlated astrophysical foregrounds by a second-order statistical approach","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Bonaldi, C. Baccigalupi, E. Salerno, G. de Zotti, L. Bedini","submitted_at":"2006-09-26T09:27:43Z","abstract_excerpt":"We present the first tests of a new method, the Correlated Component Analysis (CCA) based on second-order statistics, to estimate the mixing matrix, a key ingredient to separate astrophysical foregrounds superimposed to the Cosmic Microwave Background (CMB). In the present application, the mixing matrix is parameterized in terms of the spectral indices of Galactic synchrotron and thermal dust emissions, while the free-free spectral index is prescribed by basic physics, and is thus assumed to be known. We consider simulated observations of the microwave sky with angular resolution and white sta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609701","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:16:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DcK1q9rpEnrQzyZbVOYFG1wE9iOx79ft1yj33GNPdQ8TmEA/8u6/henx/ONhiQIKizJrwLIneEUtpMqOgZSKAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T06:45:05.430902Z"},"content_sha256":"2c4d9c5227552ef803f4905c38e0abd33a96ee3343677d062c003db3ee820b0e","schema_version":"1.0","event_id":"sha256:2c4d9c5227552ef803f4905c38e0abd33a96ee3343677d062c003db3ee820b0e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/bundle.json","state_url":"https://pith.science/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/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":"2026-06-06T06:45:05Z","links":{"resolver":"https://pith.science/pith/G4G2LMBES2KBPXA4QW3G7PP7R5","bundle":"https://pith.science/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/bundle.json","state":"https://pith.science/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G4G2LMBES2KBPXA4QW3G7PP7R5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:G4G2LMBES2KBPXA4QW3G7PP7R5","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":"e5b7102edcf207a07e1f0b7a9630f643ad226599d7a82b527d580b6dd6adcb86","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-26T09:27:43Z","title_canon_sha256":"bbd7617ca3d9054779c377d157870e62369bdd0ffeedb20ffee53151fc8d6975"},"schema_version":"1.0","source":{"id":"astro-ph/0609701","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609701","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609701v1","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609701","created_at":"2026-05-18T01:16:22Z"},{"alias_kind":"pith_short_12","alias_value":"G4G2LMBES2KB","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"G4G2LMBES2KBPXA4","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"G4G2LMBE","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:2c4d9c5227552ef803f4905c38e0abd33a96ee3343677d062c003db3ee820b0e","target":"graph","created_at":"2026-05-18T01:16:22Z","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"},"paper":{"abstract_excerpt":"We present the first tests of a new method, the Correlated Component Analysis (CCA) based on second-order statistics, to estimate the mixing matrix, a key ingredient to separate astrophysical foregrounds superimposed to the Cosmic Microwave Background (CMB). In the present application, the mixing matrix is parameterized in terms of the spectral indices of Galactic synchrotron and thermal dust emissions, while the free-free spectral index is prescribed by basic physics, and is thus assumed to be known. We consider simulated observations of the microwave sky with angular resolution and white sta","authors_text":"A. Bonaldi, C. Baccigalupi, E. Salerno, G. de Zotti, L. Bedini","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-09-26T09:27:43Z","title":"Estimating the spectral indices of correlated astrophysical foregrounds by a second-order statistical approach"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609701","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:bcb414f48f41a9009c01236f8abcfa556d8b3c5a2962cfaa2124bb92e6f1c38e","target":"record","created_at":"2026-05-18T01:16:22Z","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":"e5b7102edcf207a07e1f0b7a9630f643ad226599d7a82b527d580b6dd6adcb86","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-26T09:27:43Z","title_canon_sha256":"bbd7617ca3d9054779c377d157870e62369bdd0ffeedb20ffee53151fc8d6975"},"schema_version":"1.0","source":{"id":"astro-ph/0609701","kind":"arxiv","version":1}},"canonical_sha256":"370da5b024969417dc1c85b66fbdff8f7ab562fb9980f67f01e2ad5569b76ab0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"370da5b024969417dc1c85b66fbdff8f7ab562fb9980f67f01e2ad5569b76ab0","first_computed_at":"2026-05-18T01:16:22.196377Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:22.196377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D1f5ibPqeWwae6ws4t1JL7VmPxP2urRTJw/IVhC9zbwPXWjQdu0QrzrMys4lNmytbikhHz92sTr+PCpjusw0BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:22.197099Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0609701","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bcb414f48f41a9009c01236f8abcfa556d8b3c5a2962cfaa2124bb92e6f1c38e","sha256:2c4d9c5227552ef803f4905c38e0abd33a96ee3343677d062c003db3ee820b0e"],"state_sha256":"ee973915d190d48f71d06aafd5b71162603fc29de606ebfeff5f753e9d81aac6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9YkKmHQTDkA3Tmodlp0vK71jUOo0F4sipolcmqcusLpUgBaReTFMVKGusEAFyKEk3BfWqgR36wbKamXSCAeOAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T06:45:05.434964Z","bundle_sha256":"dcda1fd3ef2e8cfd337fc3be0a289b738e26e7742f2655470060be33aa11ad1b"}}