{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:2ZLWKQZBM2VBBC6NONU6THA377","short_pith_number":"pith:2ZLWKQZB","canonical_record":{"source":{"id":"0812.1618","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-09T05:34:52Z","cross_cats_sorted":[],"title_canon_sha256":"c5130165f18f19a7aae9e8c9d2bc1c7df822deff52c22c08ab07af9b2c0b7599","abstract_canon_sha256":"2b2c36c3e22ece58eeb47d8a1b86c17f8b98fdd4d99edbc150a503a895f3c160"},"schema_version":"1.0"},"canonical_sha256":"d65765432166aa108bcd7369e99c1bffd92884b95c53111fe11e881a9c9cd658","source":{"kind":"arxiv","id":"0812.1618","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1618","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1618v1","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1618","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"pith_short_12","alias_value":"2ZLWKQZBM2VB","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"2ZLWKQZBM2VBBC6N","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"2ZLWKQZB","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:2ZLWKQZBM2VBBC6NONU6THA377","target":"record","payload":{"canonical_record":{"source":{"id":"0812.1618","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-09T05:34:52Z","cross_cats_sorted":[],"title_canon_sha256":"c5130165f18f19a7aae9e8c9d2bc1c7df822deff52c22c08ab07af9b2c0b7599","abstract_canon_sha256":"2b2c36c3e22ece58eeb47d8a1b86c17f8b98fdd4d99edbc150a503a895f3c160"},"schema_version":"1.0"},"canonical_sha256":"d65765432166aa108bcd7369e99c1bffd92884b95c53111fe11e881a9c9cd658","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:24.676951Z","signature_b64":"HqsTum0sa94KOnHqnKwcH9V3WyVUyPZ0Wat+MMyhuJ4DRpn2XVdhWrkHg4m55riitwtU59cp4Untk3w3OCOABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d65765432166aa108bcd7369e99c1bffd92884b95c53111fe11e881a9c9cd658","last_reissued_at":"2026-05-18T04:29:24.676486Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:24.676486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0812.1618","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":"2026-05-18T04:29:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9vt/f/Fk76DQ3FJSLGjPgQRDfDmmnP+aqWEKbkcHL1mQZcKwxLaIjNce5i0pM9Pi+lQrhoUuwr/lkbzKT31OBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T14:44:06.522505Z"},"content_sha256":"b9b80de091fcae5e3c7a3c4aa65d987e38450bbaf90fa46da81f3adbd94d193e","schema_version":"1.0","event_id":"sha256:b9b80de091fcae5e3c7a3c4aa65d987e38450bbaf90fa46da81f3adbd94d193e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:2ZLWKQZBM2VBBC6NONU6THA377","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Internal Extinction in the SDSS Late-Type Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Changbom Park, Jungyeon Cho","submitted_at":"2008-12-09T05:34:52Z","abstract_excerpt":"We study internal extinction of late-type galaxies in the Sloan Digital Sky Survey. We find that the degree of internal extinction depends on both the concentration index c and K_s-band absolute magnitude M_K. We give simple fitting functions for internal extinction. In particular, we present analytic formulae giving the extinction-corrected magnitudes from the observed optical parameters. For example, the extinction-corrected r-band absolute magnitude can be obtained by M_{r,0}=-20.77 +(-1+\\sqrt{1+4\\Delta (M_{r,obs}+20.77+4.93\\Delta)})/2\\Delta, where \\Delta = 0.236\\{1.35(c-2.48)^2-1.14\\}\\log("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1618","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":"2026-05-18T04:29:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UAFODaruFhvXvankfMTImSTL/LDMsLiM4/J7MjmgoDEc7tOeH9uiBXLpq0/DgH1fl2RNSlwttg2nwYc3pXSdCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T14:44:06.522857Z"},"content_sha256":"2edb73f2073d4b7ee87696e8e34b0235d062b0d609850476423a3464142311c7","schema_version":"1.0","event_id":"sha256:2edb73f2073d4b7ee87696e8e34b0235d062b0d609850476423a3464142311c7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ZLWKQZBM2VBBC6NONU6THA377/bundle.json","state_url":"https://pith.science/pith/2ZLWKQZBM2VBBC6NONU6THA377/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ZLWKQZBM2VBBC6NONU6THA377/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":"2026-06-03T14:44:06Z","links":{"resolver":"https://pith.science/pith/2ZLWKQZBM2VBBC6NONU6THA377","bundle":"https://pith.science/pith/2ZLWKQZBM2VBBC6NONU6THA377/bundle.json","state":"https://pith.science/pith/2ZLWKQZBM2VBBC6NONU6THA377/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ZLWKQZBM2VBBC6NONU6THA377/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:2ZLWKQZBM2VBBC6NONU6THA377","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":"2b2c36c3e22ece58eeb47d8a1b86c17f8b98fdd4d99edbc150a503a895f3c160","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-09T05:34:52Z","title_canon_sha256":"c5130165f18f19a7aae9e8c9d2bc1c7df822deff52c22c08ab07af9b2c0b7599"},"schema_version":"1.0","source":{"id":"0812.1618","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.1618","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"arxiv_version","alias_value":"0812.1618v1","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.1618","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"pith_short_12","alias_value":"2ZLWKQZBM2VB","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"2ZLWKQZBM2VBBC6N","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"2ZLWKQZB","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:2edb73f2073d4b7ee87696e8e34b0235d062b0d609850476423a3464142311c7","target":"graph","created_at":"2026-05-18T04:29:24Z","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 study internal extinction of late-type galaxies in the Sloan Digital Sky Survey. We find that the degree of internal extinction depends on both the concentration index c and K_s-band absolute magnitude M_K. We give simple fitting functions for internal extinction. In particular, we present analytic formulae giving the extinction-corrected magnitudes from the observed optical parameters. For example, the extinction-corrected r-band absolute magnitude can be obtained by M_{r,0}=-20.77 +(-1+\\sqrt{1+4\\Delta (M_{r,obs}+20.77+4.93\\Delta)})/2\\Delta, where \\Delta = 0.236\\{1.35(c-2.48)^2-1.14\\}\\log(","authors_text":"Changbom Park, Jungyeon Cho","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-09T05:34:52Z","title":"Internal Extinction in the SDSS Late-Type Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.1618","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:b9b80de091fcae5e3c7a3c4aa65d987e38450bbaf90fa46da81f3adbd94d193e","target":"record","created_at":"2026-05-18T04:29:24Z","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":"2b2c36c3e22ece58eeb47d8a1b86c17f8b98fdd4d99edbc150a503a895f3c160","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-12-09T05:34:52Z","title_canon_sha256":"c5130165f18f19a7aae9e8c9d2bc1c7df822deff52c22c08ab07af9b2c0b7599"},"schema_version":"1.0","source":{"id":"0812.1618","kind":"arxiv","version":1}},"canonical_sha256":"d65765432166aa108bcd7369e99c1bffd92884b95c53111fe11e881a9c9cd658","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d65765432166aa108bcd7369e99c1bffd92884b95c53111fe11e881a9c9cd658","first_computed_at":"2026-05-18T04:29:24.676486Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:24.676486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HqsTum0sa94KOnHqnKwcH9V3WyVUyPZ0Wat+MMyhuJ4DRpn2XVdhWrkHg4m55riitwtU59cp4Untk3w3OCOABA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:24.676951Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.1618","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9b80de091fcae5e3c7a3c4aa65d987e38450bbaf90fa46da81f3adbd94d193e","sha256:2edb73f2073d4b7ee87696e8e34b0235d062b0d609850476423a3464142311c7"],"state_sha256":"a11417007ec9847fe7499c98e503c12b8fbff8d473d9ded773e65a405ab98218"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rZIVlGhjtQjn5Jdz9Qul9FMwXcgLu+ijCiC6xJ4SuM8fIbSsRlJUiqBC+9qY9oG8/lYqfV3irQVHeXUfb99bAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T14:44:06.524794Z","bundle_sha256":"be640a2f7166299abaebfe9a8d9daa38e726f5708695f7617e03de94e0439930"}}