{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:I7TUYI2OYA5CWL3NHBPI7RAI2H","short_pith_number":"pith:I7TUYI2O","canonical_record":{"source":{"id":"1009.1253","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-07T10:49:37Z","cross_cats_sorted":[],"title_canon_sha256":"42c0fa490dd1ea5db92b492affd20f0d294acb088c7a9eead2bb212c23adc4e4","abstract_canon_sha256":"d4a690e451ee24114c6b5060bfa86068115be7c029218814168ecabd90374b7c"},"schema_version":"1.0"},"canonical_sha256":"47e74c234ec03a2b2f6d385e8fc408d1c4518651dcc47910fc601c03f0d65569","source":{"kind":"arxiv","id":"1009.1253","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.1253","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"arxiv_version","alias_value":"1009.1253v1","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.1253","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"pith_short_12","alias_value":"I7TUYI2OYA5C","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"I7TUYI2OYA5CWL3N","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"I7TUYI2O","created_at":"2026-05-18T12:26:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:I7TUYI2OYA5CWL3NHBPI7RAI2H","target":"record","payload":{"canonical_record":{"source":{"id":"1009.1253","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-07T10:49:37Z","cross_cats_sorted":[],"title_canon_sha256":"42c0fa490dd1ea5db92b492affd20f0d294acb088c7a9eead2bb212c23adc4e4","abstract_canon_sha256":"d4a690e451ee24114c6b5060bfa86068115be7c029218814168ecabd90374b7c"},"schema_version":"1.0"},"canonical_sha256":"47e74c234ec03a2b2f6d385e8fc408d1c4518651dcc47910fc601c03f0d65569","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:35.748233Z","signature_b64":"oJ0OnKaBlHs3W4kzZBGlWOgt/6TDkjOq4GgwzVROAXPcTYGNoOihFx7IVq7pHNlDS7NYjhlwxAVBEVKmhU4ECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"47e74c234ec03a2b2f6d385e8fc408d1c4518651dcc47910fc601c03f0d65569","last_reissued_at":"2026-05-18T02:05:35.747623Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:35.747623Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1009.1253","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":"2026-05-18T02:05:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N6wVx3IRyOa6uAeBIG/4rwAWJqtEH7FR38mQfBCLA9WUoYtX45OtCxPBdoug9qdwjHwCRwEzTp+GZcqErlwuBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T14:36:52.343041Z"},"content_sha256":"98fc7ea38b1ab2283c8cebb501b2d209d4c12d07fd77f7ca1b91623a98799c35","schema_version":"1.0","event_id":"sha256:98fc7ea38b1ab2283c8cebb501b2d209d4c12d07fd77f7ca1b91623a98799c35"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:I7TUYI2OYA5CWL3NHBPI7RAI2H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observational Comparison of Star Formation in Different Galaxy Types","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Eva K. Grebel (ARI/ZAH, Heidelberg University)","submitted_at":"2010-09-07T10:49:37Z","abstract_excerpt":"Galaxies cover a wide range of masses and star formation histories. In this review, I summarize some of the evolutionary key features of common galaxy types. At the high-mass end, very rapid, efficient early star formation is observed, accompanied by strong enrichment and later quiescence, well-described by downsizing scenarios. In the intermediate-mass regime, early-type galaxies may still show activity in low-mass environments or when being rejuvenated by wet mergers. In late-type galaxies, we find continuous, though variable star formation over a Hubble time. In the dwarf regime, a wide ran"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.1253","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":"2026-05-18T02:05:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a0S+EHva3rlUd5p2I679YW/qxFjPxdKlpIlxkg0me0dFjxbDeSwhDAxQ9kVmJqaHPycK0GJ1lBxdu988UPwkAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T14:36:52.343430Z"},"content_sha256":"ca2ecb6945245fa754119b712e7e1486631df51fbb94bef7f28f12d6ab236620","schema_version":"1.0","event_id":"sha256:ca2ecb6945245fa754119b712e7e1486631df51fbb94bef7f28f12d6ab236620"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/bundle.json","state_url":"https://pith.science/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/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":"2026-06-01T14:36:52Z","links":{"resolver":"https://pith.science/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H","bundle":"https://pith.science/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/bundle.json","state":"https://pith.science/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I7TUYI2OYA5CWL3NHBPI7RAI2H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:I7TUYI2OYA5CWL3NHBPI7RAI2H","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":"d4a690e451ee24114c6b5060bfa86068115be7c029218814168ecabd90374b7c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-07T10:49:37Z","title_canon_sha256":"42c0fa490dd1ea5db92b492affd20f0d294acb088c7a9eead2bb212c23adc4e4"},"schema_version":"1.0","source":{"id":"1009.1253","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.1253","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"arxiv_version","alias_value":"1009.1253v1","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.1253","created_at":"2026-05-18T02:05:35Z"},{"alias_kind":"pith_short_12","alias_value":"I7TUYI2OYA5C","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"I7TUYI2OYA5CWL3N","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"I7TUYI2O","created_at":"2026-05-18T12:26:09Z"}],"graph_snapshots":[{"event_id":"sha256:ca2ecb6945245fa754119b712e7e1486631df51fbb94bef7f28f12d6ab236620","target":"graph","created_at":"2026-05-18T02:05:35Z","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":"Galaxies cover a wide range of masses and star formation histories. In this review, I summarize some of the evolutionary key features of common galaxy types. At the high-mass end, very rapid, efficient early star formation is observed, accompanied by strong enrichment and later quiescence, well-described by downsizing scenarios. In the intermediate-mass regime, early-type galaxies may still show activity in low-mass environments or when being rejuvenated by wet mergers. In late-type galaxies, we find continuous, though variable star formation over a Hubble time. In the dwarf regime, a wide ran","authors_text":"Eva K. Grebel (ARI/ZAH, Heidelberg University)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-07T10:49:37Z","title":"Observational Comparison of Star Formation in Different Galaxy Types"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.1253","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":"sha256:98fc7ea38b1ab2283c8cebb501b2d209d4c12d07fd77f7ca1b91623a98799c35","target":"record","created_at":"2026-05-18T02:05:35Z","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":"d4a690e451ee24114c6b5060bfa86068115be7c029218814168ecabd90374b7c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-07T10:49:37Z","title_canon_sha256":"42c0fa490dd1ea5db92b492affd20f0d294acb088c7a9eead2bb212c23adc4e4"},"schema_version":"1.0","source":{"id":"1009.1253","kind":"arxiv","version":1}},"canonical_sha256":"47e74c234ec03a2b2f6d385e8fc408d1c4518651dcc47910fc601c03f0d65569","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"47e74c234ec03a2b2f6d385e8fc408d1c4518651dcc47910fc601c03f0d65569","first_computed_at":"2026-05-18T02:05:35.747623Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:35.747623Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oJ0OnKaBlHs3W4kzZBGlWOgt/6TDkjOq4GgwzVROAXPcTYGNoOihFx7IVq7pHNlDS7NYjhlwxAVBEVKmhU4ECw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:35.748233Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.1253","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:98fc7ea38b1ab2283c8cebb501b2d209d4c12d07fd77f7ca1b91623a98799c35","sha256:ca2ecb6945245fa754119b712e7e1486631df51fbb94bef7f28f12d6ab236620"],"state_sha256":"8a7536ee168c2ed00e9955345ba36c100e08f55ca27d8a47e7fc6ed1c5a07ae2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qd7p020Qd9H+c39qbDRVS4/MCl7qiS85g6V5m6qsC9b71PJXuOnmvZC5GqOoRb1TdxgID1nD+hF8T32hnwDmCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T14:36:52.345401Z","bundle_sha256":"f2fc51c941913de98c69448608a4a7e10a956f8d4908043b21a4c17a47bcfac8"}}