{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:7Y646WTTUNFMIESZZPYBB2HLJX","short_pith_number":"pith:7Y646WTT","canonical_record":{"source":{"id":"1008.3045","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-18T08:44:27Z","cross_cats_sorted":[],"title_canon_sha256":"45a211dde404f947fbbe96ea576357f7f5fc54cba09f130988e98b364c369091","abstract_canon_sha256":"154c1bee65b0d988c78aa5112dba59e5be07430c1f2fc8607edcf0af985a2aca"},"schema_version":"1.0"},"canonical_sha256":"fe3dcf5a73a34ac41259cbf010e8eb4ded9cc6259fb4fc97c9e4030283e52f8e","source":{"kind":"arxiv","id":"1008.3045","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.3045","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"arxiv_version","alias_value":"1008.3045v2","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.3045","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"pith_short_12","alias_value":"7Y646WTTUNFM","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"7Y646WTTUNFMIESZ","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"7Y646WTT","created_at":"2026-05-18T12:26:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:7Y646WTTUNFMIESZZPYBB2HLJX","target":"record","payload":{"canonical_record":{"source":{"id":"1008.3045","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-18T08:44:27Z","cross_cats_sorted":[],"title_canon_sha256":"45a211dde404f947fbbe96ea576357f7f5fc54cba09f130988e98b364c369091","abstract_canon_sha256":"154c1bee65b0d988c78aa5112dba59e5be07430c1f2fc8607edcf0af985a2aca"},"schema_version":"1.0"},"canonical_sha256":"fe3dcf5a73a34ac41259cbf010e8eb4ded9cc6259fb4fc97c9e4030283e52f8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:47.122737Z","signature_b64":"+279Vo4pqEH4L1gckmlkpnJl1MalQYHCBz97bgNWbjYHH33xlag6desjAhkqLHlSRrrF63tVi4U76YU1ec6ABw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fe3dcf5a73a34ac41259cbf010e8eb4ded9cc6259fb4fc97c9e4030283e52f8e","last_reissued_at":"2026-05-18T02:05:47.121999Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:47.121999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.3045","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:05:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TEk/2KMdDwvs5sO/7X3H0Dd1TwxNi+NiaXFkgYOrPS6V3lHSA69AT/aiD3hawGR5jGD6rJJ4d1AWGo3ZS24zAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:08:35.637156Z"},"content_sha256":"01682f525add240fab7773df57fd8e64505ada921e17d9820b938239166685a3","schema_version":"1.0","event_id":"sha256:01682f525add240fab7773df57fd8e64505ada921e17d9820b938239166685a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:7Y646WTTUNFMIESZZPYBB2HLJX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The mass-dependent star formation histories of disk galaxies: infall model versus observations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C.G. Shu, J.L. Hou, R.X. Chang, S.Y. Shen","submitted_at":"2010-08-18T08:44:27Z","abstract_excerpt":"We introduce a simple model to explore the star formation histories of disk galaxies. We assume that the disk origins and grows by continuous gas infall. The gas infall rate is parametrized by the Gaussian formula with one free parameter: infall-peak time $t_p$. The Kennicutt star formation law is adopted to describe how much cold gas turns into stars. The gas outflow process is also considered in our model. We find that, at given galactic stellar mass $M_*$, model adopting late infall-peak time $t_p$ results in blue colors, low metallicity, high specific star formation rate and high gas fract"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.3045","kind":"arxiv","version":2},"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":"2026-05-18T02:05:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7y5PGwdFT1W0wagUQOp2CayhnR2vAh0piTaZskZI8Tuxrx3N0kCDBASUDw1d91V34kLHPlyM4FvrAanSEukxBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:08:35.637527Z"},"content_sha256":"7e65f07956026e1f0514e12f5601977a8b5e94b616d5dec05031d418e2e96fc1","schema_version":"1.0","event_id":"sha256:7e65f07956026e1f0514e12f5601977a8b5e94b616d5dec05031d418e2e96fc1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7Y646WTTUNFMIESZZPYBB2HLJX/bundle.json","state_url":"https://pith.science/pith/7Y646WTTUNFMIESZZPYBB2HLJX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7Y646WTTUNFMIESZZPYBB2HLJX/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":"2026-06-05T13:08:35Z","links":{"resolver":"https://pith.science/pith/7Y646WTTUNFMIESZZPYBB2HLJX","bundle":"https://pith.science/pith/7Y646WTTUNFMIESZZPYBB2HLJX/bundle.json","state":"https://pith.science/pith/7Y646WTTUNFMIESZZPYBB2HLJX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7Y646WTTUNFMIESZZPYBB2HLJX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:7Y646WTTUNFMIESZZPYBB2HLJX","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":"154c1bee65b0d988c78aa5112dba59e5be07430c1f2fc8607edcf0af985a2aca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-18T08:44:27Z","title_canon_sha256":"45a211dde404f947fbbe96ea576357f7f5fc54cba09f130988e98b364c369091"},"schema_version":"1.0","source":{"id":"1008.3045","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.3045","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"arxiv_version","alias_value":"1008.3045v2","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.3045","created_at":"2026-05-18T02:05:47Z"},{"alias_kind":"pith_short_12","alias_value":"7Y646WTTUNFM","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_16","alias_value":"7Y646WTTUNFMIESZ","created_at":"2026-05-18T12:26:05Z"},{"alias_kind":"pith_short_8","alias_value":"7Y646WTT","created_at":"2026-05-18T12:26:05Z"}],"graph_snapshots":[{"event_id":"sha256:7e65f07956026e1f0514e12f5601977a8b5e94b616d5dec05031d418e2e96fc1","target":"graph","created_at":"2026-05-18T02:05:47Z","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 introduce a simple model to explore the star formation histories of disk galaxies. We assume that the disk origins and grows by continuous gas infall. The gas infall rate is parametrized by the Gaussian formula with one free parameter: infall-peak time $t_p$. The Kennicutt star formation law is adopted to describe how much cold gas turns into stars. The gas outflow process is also considered in our model. We find that, at given galactic stellar mass $M_*$, model adopting late infall-peak time $t_p$ results in blue colors, low metallicity, high specific star formation rate and high gas fract","authors_text":"C.G. Shu, J.L. Hou, R.X. Chang, S.Y. Shen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-18T08:44:27Z","title":"The mass-dependent star formation histories of disk galaxies: infall model versus observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.3045","kind":"arxiv","version":2},"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":"sha256:01682f525add240fab7773df57fd8e64505ada921e17d9820b938239166685a3","target":"record","created_at":"2026-05-18T02:05:47Z","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":"154c1bee65b0d988c78aa5112dba59e5be07430c1f2fc8607edcf0af985a2aca","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-18T08:44:27Z","title_canon_sha256":"45a211dde404f947fbbe96ea576357f7f5fc54cba09f130988e98b364c369091"},"schema_version":"1.0","source":{"id":"1008.3045","kind":"arxiv","version":2}},"canonical_sha256":"fe3dcf5a73a34ac41259cbf010e8eb4ded9cc6259fb4fc97c9e4030283e52f8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe3dcf5a73a34ac41259cbf010e8eb4ded9cc6259fb4fc97c9e4030283e52f8e","first_computed_at":"2026-05-18T02:05:47.121999Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:47.121999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+279Vo4pqEH4L1gckmlkpnJl1MalQYHCBz97bgNWbjYHH33xlag6desjAhkqLHlSRrrF63tVi4U76YU1ec6ABw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:47.122737Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.3045","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:01682f525add240fab7773df57fd8e64505ada921e17d9820b938239166685a3","sha256:7e65f07956026e1f0514e12f5601977a8b5e94b616d5dec05031d418e2e96fc1"],"state_sha256":"553269e4470ba7558b1c5b8e74b84936146d70d5f3527dab889275029563ee8e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dkE3yewZxyFONTajKI67j70ZcUqag5iDrPnDszB/jtfu7VGhsgpIaikPdPAGBEDpCI9YFbITNWXRpeD8E23ODg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T13:08:35.639574Z","bundle_sha256":"2d81b73dc1c16d14399910ba6726bd6d847c806c951588bef92f02841b09a598"}}