{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YBSOCYPO7HVQ62PWPMIP3IJISN","short_pith_number":"pith:YBSOCYPO","canonical_record":{"source":{"id":"1808.03286","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-09T18:00:42Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"23d04fc78182f5b6a1a4eafb203f9af15da6c9e84edbce7a5f1e8f6ee1497690","abstract_canon_sha256":"12adebf9b588e7113133cd34bc9ea22c39eacd4be0891bc68d5faa6e721bd2b3"},"schema_version":"1.0"},"canonical_sha256":"c064e161eef9eb0f69f67b10fda1289348feed626bf8375992969937e44b92eb","source":{"kind":"arxiv","id":"1808.03286","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.03286","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"arxiv_version","alias_value":"1808.03286v1","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.03286","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"pith_short_12","alias_value":"YBSOCYPO7HVQ","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YBSOCYPO7HVQ62PW","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YBSOCYPO","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YBSOCYPO7HVQ62PWPMIP3IJISN","target":"record","payload":{"canonical_record":{"source":{"id":"1808.03286","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-09T18:00:42Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"23d04fc78182f5b6a1a4eafb203f9af15da6c9e84edbce7a5f1e8f6ee1497690","abstract_canon_sha256":"12adebf9b588e7113133cd34bc9ea22c39eacd4be0891bc68d5faa6e721bd2b3"},"schema_version":"1.0"},"canonical_sha256":"c064e161eef9eb0f69f67b10fda1289348feed626bf8375992969937e44b92eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:55.764366Z","signature_b64":"voKaN8MHhXRMiSkUJNHQH5ATrvzKHg5FkW6SLtvgN4cDeGzXg05mVPY4sFrHoaO8qQFj18lKLNb/l+9Hsm8sCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c064e161eef9eb0f69f67b10fda1289348feed626bf8375992969937e44b92eb","last_reissued_at":"2026-05-18T00:05:55.763821Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:55.763821Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.03286","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":"2026-05-18T00:05:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c+jJG0YB2bCxeAj3WGVGyAGq6LoSH5XIIeCi2Bq1wrTTricTuQmaB1UYv8hGFX58DjDGkFxi4ttsX6j7YmVCCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:41:43.582627Z"},"content_sha256":"e3712a7600284b9bbf1ad45baf1fee0bc3714e47f841986351ddee34221dba02","schema_version":"1.0","event_id":"sha256:e3712a7600284b9bbf1ad45baf1fee0bc3714e47f841986351ddee34221dba02"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YBSOCYPO7HVQ62PWPMIP3IJISN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CLUES about M33: the reversed radial stellar age gradient in the outskirts of Triangulum galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Alexander Knebe, Arianna Di Cintio, Chris Brook, Ivan Minchev, Noam I. Libeskind, Robert Mostoghiu","submitted_at":"2018-08-09T18:00:42Z","abstract_excerpt":"HST/ACS observations along the major axis of M33 show that the mean age of its stars decreases with increasing distance from the galaxy center. Such a behavior is consistent with an inside-out growth of the disc. However, in the outermost observed field, at r$\\simeq$11.6 kpc, a reversal of this gradient is detected, with old stars found in high percentages beyond this radius. In this work we investigate the origin of such a reversal in stellar age gradient, by using a simulated M33 analogue from the Constrained Local UniversE Simulations (CLUES). The simulated M33 is similar to the observed on"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.03286","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":"2026-05-18T00:05:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JoqTTZIP/23sTu4+WfKPQM+kWsyS6jl0HjCc86rPxyRZAUDOFqCc/QF9Gzgu6OwaYLlKMNrw3kTHwYMJ66cMAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T12:41:43.583270Z"},"content_sha256":"a11a780ec040275ec8f355b5d3b913d02b676b3c21baed1a7dad133a988826b6","schema_version":"1.0","event_id":"sha256:a11a780ec040275ec8f355b5d3b913d02b676b3c21baed1a7dad133a988826b6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/bundle.json","state_url":"https://pith.science/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/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":"2026-05-26T12:41:43Z","links":{"resolver":"https://pith.science/pith/YBSOCYPO7HVQ62PWPMIP3IJISN","bundle":"https://pith.science/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/bundle.json","state":"https://pith.science/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YBSOCYPO7HVQ62PWPMIP3IJISN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YBSOCYPO7HVQ62PWPMIP3IJISN","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":"12adebf9b588e7113133cd34bc9ea22c39eacd4be0891bc68d5faa6e721bd2b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-09T18:00:42Z","title_canon_sha256":"23d04fc78182f5b6a1a4eafb203f9af15da6c9e84edbce7a5f1e8f6ee1497690"},"schema_version":"1.0","source":{"id":"1808.03286","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.03286","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"arxiv_version","alias_value":"1808.03286v1","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.03286","created_at":"2026-05-18T00:05:55Z"},{"alias_kind":"pith_short_12","alias_value":"YBSOCYPO7HVQ","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YBSOCYPO7HVQ62PW","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YBSOCYPO","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:a11a780ec040275ec8f355b5d3b913d02b676b3c21baed1a7dad133a988826b6","target":"graph","created_at":"2026-05-18T00:05:55Z","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":"HST/ACS observations along the major axis of M33 show that the mean age of its stars decreases with increasing distance from the galaxy center. Such a behavior is consistent with an inside-out growth of the disc. However, in the outermost observed field, at r$\\simeq$11.6 kpc, a reversal of this gradient is detected, with old stars found in high percentages beyond this radius. In this work we investigate the origin of such a reversal in stellar age gradient, by using a simulated M33 analogue from the Constrained Local UniversE Simulations (CLUES). The simulated M33 is similar to the observed on","authors_text":"Alexander Knebe, Arianna Di Cintio, Chris Brook, Ivan Minchev, Noam I. Libeskind, Robert Mostoghiu","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-09T18:00:42Z","title":"CLUES about M33: the reversed radial stellar age gradient in the outskirts of Triangulum galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.03286","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:e3712a7600284b9bbf1ad45baf1fee0bc3714e47f841986351ddee34221dba02","target":"record","created_at":"2026-05-18T00:05:55Z","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":"12adebf9b588e7113133cd34bc9ea22c39eacd4be0891bc68d5faa6e721bd2b3","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-09T18:00:42Z","title_canon_sha256":"23d04fc78182f5b6a1a4eafb203f9af15da6c9e84edbce7a5f1e8f6ee1497690"},"schema_version":"1.0","source":{"id":"1808.03286","kind":"arxiv","version":1}},"canonical_sha256":"c064e161eef9eb0f69f67b10fda1289348feed626bf8375992969937e44b92eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c064e161eef9eb0f69f67b10fda1289348feed626bf8375992969937e44b92eb","first_computed_at":"2026-05-18T00:05:55.763821Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:05:55.763821Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"voKaN8MHhXRMiSkUJNHQH5ATrvzKHg5FkW6SLtvgN4cDeGzXg05mVPY4sFrHoaO8qQFj18lKLNb/l+9Hsm8sCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:05:55.764366Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.03286","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3712a7600284b9bbf1ad45baf1fee0bc3714e47f841986351ddee34221dba02","sha256:a11a780ec040275ec8f355b5d3b913d02b676b3c21baed1a7dad133a988826b6"],"state_sha256":"7bdaf8df24147eae2cbd4c8e5ccb232d8baecdfda66b2de58c60a1a9fe7d2a02"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YJt0E/PLsiQrldnpB/0VpIcUMBo9T029zZoY1P+OLabjzWSydclBkhDTeI1TCR2Q3gVn55YlURDqubftuk7JDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T12:41:43.586815Z","bundle_sha256":"bc05479e479f15d3acc0a9739fc5b06e2d7b9b36706d3d96ca3e9b4e14e3d75e"}}