{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:ZE7AINAYCHJJWO3G2RAVT3Z7ZN","short_pith_number":"pith:ZE7AINAY","canonical_record":{"source":{"id":"1004.4336","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-25T08:30:24Z","cross_cats_sorted":[],"title_canon_sha256":"56e0e314d34d5049a05c671593bac35ba5e3f704b352156b319f6600bb21d052","abstract_canon_sha256":"86325ee2a948e427e11f573d7a4df42fe09d22cd5361ffb7f06d1600f0de5f39"},"schema_version":"1.0"},"canonical_sha256":"c93e04341811d29b3b66d44159ef3fcb7c9325e7295f6d7a15cd98d5a84223b8","source":{"kind":"arxiv","id":"1004.4336","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.4336","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"arxiv_version","alias_value":"1004.4336v1","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.4336","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"pith_short_12","alias_value":"ZE7AINAYCHJJ","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"ZE7AINAYCHJJWO3G","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"ZE7AINAY","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:ZE7AINAYCHJJWO3G2RAVT3Z7ZN","target":"record","payload":{"canonical_record":{"source":{"id":"1004.4336","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-25T08:30:24Z","cross_cats_sorted":[],"title_canon_sha256":"56e0e314d34d5049a05c671593bac35ba5e3f704b352156b319f6600bb21d052","abstract_canon_sha256":"86325ee2a948e427e11f573d7a4df42fe09d22cd5361ffb7f06d1600f0de5f39"},"schema_version":"1.0"},"canonical_sha256":"c93e04341811d29b3b66d44159ef3fcb7c9325e7295f6d7a15cd98d5a84223b8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:07:54.212286Z","signature_b64":"0EUgvUwtZe8XBxMIIK6kcnWnaQfv7fevtaK88JrSfyjJVPxDetYG4/5dGSDtX0ToEOHWrce7nsh6SxWu5EGUAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c93e04341811d29b3b66d44159ef3fcb7c9325e7295f6d7a15cd98d5a84223b8","last_reissued_at":"2026-05-18T02:07:54.211646Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:07:54.211646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1004.4336","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":"2026-05-18T02:07:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W4HQJrj7XvtLv8WWRmIK0T0FeXrIV0vBDRsDz9tYnG3vqJcoLQCv6HUtwby4UHv7KgWOTmsPjIsVhnRhtRSKAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:16:32.759789Z"},"content_sha256":"2489b5b22367d9691b8c0f7c181731959f07617f142920d7002be9e285e730bf","schema_version":"1.0","event_id":"sha256:2489b5b22367d9691b8c0f7c181731959f07617f142920d7002be9e285e730bf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:ZE7AINAYCHJJWO3G2RAVT3Z7ZN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The star formation histories of red and blue low surface brightness disk galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"F. Hammer, G. H. Zhong, H. Flores, L.C. Deng, X.Y. Chen, Y.C. Liang","submitted_at":"2010-04-25T08:30:24Z","abstract_excerpt":"We study the star formation histories (SFH) and stellar populations of 213 red and 226 blue nearly face-on low surface brightness disk galaxies (LSBGs), which are selected from the main galaxy sample of Sloan Digital Sky Survey (SDSS) Data Release Seven (DR7). We also want to compare the stellar populations and SFH between the two groups. The sample of both red and blue LSBGs have sufficient signal-to-noise ratio in the spectral continua. We obtain their absorption-line indices (e.g. Mg_2, H\\delta_A), D_n(4000) and stellar masses from the MPA/JHU catalogs to study their stellar populations and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.4336","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":"2026-05-18T02:07:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VSMP6z0YV+JGHaTud5vD4uPv76EppfJxU4+89hl/3wXh6NFvqGQYfUYf+KhE6nvNggSilk+WnzN4f6/LKZhlCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:16:32.760435Z"},"content_sha256":"29caac2c36964f39c75971e3a2ee4aba05be5783ead2a13b2edef9b1b5e0a37c","schema_version":"1.0","event_id":"sha256:29caac2c36964f39c75971e3a2ee4aba05be5783ead2a13b2edef9b1b5e0a37c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/bundle.json","state_url":"https://pith.science/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/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":"2026-05-25T20:16:32Z","links":{"resolver":"https://pith.science/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN","bundle":"https://pith.science/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/bundle.json","state":"https://pith.science/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZE7AINAYCHJJWO3G2RAVT3Z7ZN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:ZE7AINAYCHJJWO3G2RAVT3Z7ZN","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":"86325ee2a948e427e11f573d7a4df42fe09d22cd5361ffb7f06d1600f0de5f39","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-25T08:30:24Z","title_canon_sha256":"56e0e314d34d5049a05c671593bac35ba5e3f704b352156b319f6600bb21d052"},"schema_version":"1.0","source":{"id":"1004.4336","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1004.4336","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"arxiv_version","alias_value":"1004.4336v1","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1004.4336","created_at":"2026-05-18T02:07:54Z"},{"alias_kind":"pith_short_12","alias_value":"ZE7AINAYCHJJ","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"ZE7AINAYCHJJWO3G","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"ZE7AINAY","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:29caac2c36964f39c75971e3a2ee4aba05be5783ead2a13b2edef9b1b5e0a37c","target":"graph","created_at":"2026-05-18T02:07:54Z","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 the star formation histories (SFH) and stellar populations of 213 red and 226 blue nearly face-on low surface brightness disk galaxies (LSBGs), which are selected from the main galaxy sample of Sloan Digital Sky Survey (SDSS) Data Release Seven (DR7). We also want to compare the stellar populations and SFH between the two groups. The sample of both red and blue LSBGs have sufficient signal-to-noise ratio in the spectral continua. We obtain their absorption-line indices (e.g. Mg_2, H\\delta_A), D_n(4000) and stellar masses from the MPA/JHU catalogs to study their stellar populations and","authors_text":"F. Hammer, G. H. Zhong, H. Flores, L.C. Deng, X.Y. Chen, Y.C. Liang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-25T08:30:24Z","title":"The star formation histories of red and blue low surface brightness disk galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.4336","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":"sha256:2489b5b22367d9691b8c0f7c181731959f07617f142920d7002be9e285e730bf","target":"record","created_at":"2026-05-18T02:07:54Z","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":"86325ee2a948e427e11f573d7a4df42fe09d22cd5361ffb7f06d1600f0de5f39","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-25T08:30:24Z","title_canon_sha256":"56e0e314d34d5049a05c671593bac35ba5e3f704b352156b319f6600bb21d052"},"schema_version":"1.0","source":{"id":"1004.4336","kind":"arxiv","version":1}},"canonical_sha256":"c93e04341811d29b3b66d44159ef3fcb7c9325e7295f6d7a15cd98d5a84223b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c93e04341811d29b3b66d44159ef3fcb7c9325e7295f6d7a15cd98d5a84223b8","first_computed_at":"2026-05-18T02:07:54.211646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:07:54.211646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0EUgvUwtZe8XBxMIIK6kcnWnaQfv7fevtaK88JrSfyjJVPxDetYG4/5dGSDtX0ToEOHWrce7nsh6SxWu5EGUAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:07:54.212286Z","signed_message":"canonical_sha256_bytes"},"source_id":"1004.4336","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2489b5b22367d9691b8c0f7c181731959f07617f142920d7002be9e285e730bf","sha256:29caac2c36964f39c75971e3a2ee4aba05be5783ead2a13b2edef9b1b5e0a37c"],"state_sha256":"56722566c795ed4b585efa99353680135b872ff7db14938fe0d33916887e09a2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xX7B/Gb6A2E3KZgLdezsZsK9VJZO+kbq314LKSq7ci2FJ1Nhpo43U/MhjTkmghfap1QlWefPI8JIlKx04qPzCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T20:16:32.763095Z","bundle_sha256":"a678b706c2c35ef40d32c7ea6c17cd6095a72f92f2f5605797950517ad89d180"}}