{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:GRPLMTGI2D47DWILHXOFLDWWRZ","short_pith_number":"pith:GRPLMTGI","canonical_record":{"source":{"id":"1201.6417","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-31T01:48:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"5d68ce937e69f8cda318d0f776c830f2f2b89e78cb7088fafee4dfcb7cf80179","abstract_canon_sha256":"ec2bd560fafaa9c9464d7dd75e96a334e9383a14eee962ecae5a4d86ec985452"},"schema_version":"1.0"},"canonical_sha256":"345eb64cc8d0f9f1d90b3ddc558ed68e4fecdf217eec5cbb31402e04107d7ce0","source":{"kind":"arxiv","id":"1201.6417","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.6417","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"arxiv_version","alias_value":"1201.6417v2","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.6417","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"pith_short_12","alias_value":"GRPLMTGI2D47","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GRPLMTGI2D47DWIL","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GRPLMTGI","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:GRPLMTGI2D47DWILHXOFLDWWRZ","target":"record","payload":{"canonical_record":{"source":{"id":"1201.6417","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-31T01:48:26Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"5d68ce937e69f8cda318d0f776c830f2f2b89e78cb7088fafee4dfcb7cf80179","abstract_canon_sha256":"ec2bd560fafaa9c9464d7dd75e96a334e9383a14eee962ecae5a4d86ec985452"},"schema_version":"1.0"},"canonical_sha256":"345eb64cc8d0f9f1d90b3ddc558ed68e4fecdf217eec5cbb31402e04107d7ce0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:02:24.778729Z","signature_b64":"2BPQgoutz8W3NlkyNHsrEeMBI4r76iOf9+rEiKxGICr7yGHcvRAqslG8Fw5qRljSouGXwfu9QqokCrsy5RNDDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"345eb64cc8d0f9f1d90b3ddc558ed68e4fecdf217eec5cbb31402e04107d7ce0","last_reissued_at":"2026-05-18T04:02:24.778209Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:02:24.778209Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.6417","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":"2026-05-18T04:02:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6phSFd2j7MKTbXO9kzVJx+0hhxsV5UpfaRDeoxiJ6YuBk8HoxS1Qk5u4f1kTVnp23xyfa9Lr+bNLr+VM6FWQDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:34:36.642816Z"},"content_sha256":"4fb1a12a06d4810b032bcf6b8743592d20fcd61c97bc3869bb0f1597b2a63e63","schema_version":"1.0","event_id":"sha256:4fb1a12a06d4810b032bcf6b8743592d20fcd61c97bc3869bb0f1597b2a63e63"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:GRPLMTGI2D47DWILHXOFLDWWRZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Metallicity Gradients in Simulated Disk Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"B.K. Gibson, K. Pilkington","submitted_at":"2012-01-31T01:48:26Z","abstract_excerpt":"The stellar metallicity and abundance ratio gradients from the fiducial late-type galaxy simulation of Stinson et al. (2010) are presented. Over 1-3 scalelengths, gradients are shown to flatten with time, consistent with empirical evidence at high- and low-redshifts. Kinematic effects, including radial migration, though, flatten these intrinsicly steep gradients such that by redshift z=0, the measured gradients of these (now) old stars are flatter than their young counterparts, in contradiction to what is observed locally. Conversely, the stellar [O/Fe] gradient is (to first order) robust agai"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.6417","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":"2026-05-18T04:02:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XhHznMjXqofD/mCCN7PEZ/78Qhdab3gHLR9u6L6g7DuEddGnfogDJLF/ld3NKCeAm8F7yKhK7rmqYjS/vgKyBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:34:36.643303Z"},"content_sha256":"7362819112fdbc8a41ae149a29f8baa1572667ec73d532b968693d548c0cfa52","schema_version":"1.0","event_id":"sha256:7362819112fdbc8a41ae149a29f8baa1572667ec73d532b968693d548c0cfa52"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/bundle.json","state_url":"https://pith.science/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/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":"2026-07-05T08:34:36Z","links":{"resolver":"https://pith.science/pith/GRPLMTGI2D47DWILHXOFLDWWRZ","bundle":"https://pith.science/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/bundle.json","state":"https://pith.science/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GRPLMTGI2D47DWILHXOFLDWWRZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:GRPLMTGI2D47DWILHXOFLDWWRZ","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":"ec2bd560fafaa9c9464d7dd75e96a334e9383a14eee962ecae5a4d86ec985452","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-31T01:48:26Z","title_canon_sha256":"5d68ce937e69f8cda318d0f776c830f2f2b89e78cb7088fafee4dfcb7cf80179"},"schema_version":"1.0","source":{"id":"1201.6417","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.6417","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"arxiv_version","alias_value":"1201.6417v2","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.6417","created_at":"2026-05-18T04:02:24Z"},{"alias_kind":"pith_short_12","alias_value":"GRPLMTGI2D47","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GRPLMTGI2D47DWIL","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GRPLMTGI","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:7362819112fdbc8a41ae149a29f8baa1572667ec73d532b968693d548c0cfa52","target":"graph","created_at":"2026-05-18T04:02:24Z","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":"The stellar metallicity and abundance ratio gradients from the fiducial late-type galaxy simulation of Stinson et al. (2010) are presented. Over 1-3 scalelengths, gradients are shown to flatten with time, consistent with empirical evidence at high- and low-redshifts. Kinematic effects, including radial migration, though, flatten these intrinsicly steep gradients such that by redshift z=0, the measured gradients of these (now) old stars are flatter than their young counterparts, in contradiction to what is observed locally. Conversely, the stellar [O/Fe] gradient is (to first order) robust agai","authors_text":"B.K. Gibson, K. Pilkington","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-31T01:48:26Z","title":"Metallicity Gradients in Simulated Disk Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.6417","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":"sha256:4fb1a12a06d4810b032bcf6b8743592d20fcd61c97bc3869bb0f1597b2a63e63","target":"record","created_at":"2026-05-18T04:02:24Z","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":"ec2bd560fafaa9c9464d7dd75e96a334e9383a14eee962ecae5a4d86ec985452","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-31T01:48:26Z","title_canon_sha256":"5d68ce937e69f8cda318d0f776c830f2f2b89e78cb7088fafee4dfcb7cf80179"},"schema_version":"1.0","source":{"id":"1201.6417","kind":"arxiv","version":2}},"canonical_sha256":"345eb64cc8d0f9f1d90b3ddc558ed68e4fecdf217eec5cbb31402e04107d7ce0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"345eb64cc8d0f9f1d90b3ddc558ed68e4fecdf217eec5cbb31402e04107d7ce0","first_computed_at":"2026-05-18T04:02:24.778209Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:02:24.778209Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2BPQgoutz8W3NlkyNHsrEeMBI4r76iOf9+rEiKxGICr7yGHcvRAqslG8Fw5qRljSouGXwfu9QqokCrsy5RNDDw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:02:24.778729Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.6417","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fb1a12a06d4810b032bcf6b8743592d20fcd61c97bc3869bb0f1597b2a63e63","sha256:7362819112fdbc8a41ae149a29f8baa1572667ec73d532b968693d548c0cfa52"],"state_sha256":"7f91101586430b2ec408282a6f933fc29d0686acda523b7326fa760f7d426463"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Co0ScOpY0O20QGQa+vRf0tldTlgWM1Jqmp+UX6EHNYXMzt9ZoDSBxzw8sHbchhG6wljlgQjRlwtdKPzeqoBMBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T08:34:36.645380Z","bundle_sha256":"b2bb970892ffa42a41d24c58f8483c4ca8b5145a728c61319f376fcf76cc5e64"}}