{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:DNA5J7XTZ6BUDWEF4TFKKSLNDG","short_pith_number":"pith:DNA5J7XT","canonical_record":{"source":{"id":"1002.0009","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-01-29T21:10:27Z","cross_cats_sorted":[],"title_canon_sha256":"555c0488dea859424dd42c4240465035967416c075fc270c4ff832537823147d","abstract_canon_sha256":"3c1062c1f2a1e37fff8853cde88d65fea03fa29fe06e97cd307b44100ebc21a1"},"schema_version":"1.0"},"canonical_sha256":"1b41d4fef3cf8341d885e4caa5496d1988a4902d1dd2bafa566d99e8ac5e528b","source":{"kind":"arxiv","id":"1002.0009","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.0009","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"arxiv_version","alias_value":"1002.0009v1","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.0009","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"pith_short_12","alias_value":"DNA5J7XTZ6BU","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"DNA5J7XTZ6BUDWEF","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"DNA5J7XT","created_at":"2026-05-18T12:26:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:DNA5J7XTZ6BUDWEF4TFKKSLNDG","target":"record","payload":{"canonical_record":{"source":{"id":"1002.0009","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-01-29T21:10:27Z","cross_cats_sorted":[],"title_canon_sha256":"555c0488dea859424dd42c4240465035967416c075fc270c4ff832537823147d","abstract_canon_sha256":"3c1062c1f2a1e37fff8853cde88d65fea03fa29fe06e97cd307b44100ebc21a1"},"schema_version":"1.0"},"canonical_sha256":"1b41d4fef3cf8341d885e4caa5496d1988a4902d1dd2bafa566d99e8ac5e528b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:21.934373Z","signature_b64":"eAcW1yQMvUuczNxSpvfRxhGsM+8oEp3iBH1u4IA0bmcHwC+S7cc6t+Wq8tHqVV6FC4rL2OA8myP43cEw2A5PAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1b41d4fef3cf8341d885e4caa5496d1988a4902d1dd2bafa566d99e8ac5e528b","last_reissued_at":"2026-05-18T02:09:21.933735Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:21.933735Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.0009","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":"2026-05-18T02:09:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q4LKHAV8DVif+StMOmn+4K19CIS+h3vWClrzdYiGv66trcSq4vKhohlLX/8XRV0VkKvudIlbWdNzNVl4VKgeDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T09:33:46.389023Z"},"content_sha256":"9052a6d7065399aa786c98afefc4d6c0a40080600d57ea374002aceb42941903","schema_version":"1.0","event_id":"sha256:9052a6d7065399aa786c98afefc4d6c0a40080600d57ea374002aceb42941903"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:DNA5J7XTZ6BUDWEF4TFKKSLNDG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Star Cluster Population of the Collisional Ring Galaxy NGC 922","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Anne Pellerin, Debra M. Elmegreen, Gerhardt R. Meurer, Kenji Bekki, O. Ivy Wong, Patricia M. Knezek","submitted_at":"2010-01-29T21:10:27Z","abstract_excerpt":"We present a detailed study of the star cluster population detected in the galaxy NGC922, one of the closest collisional ring galaxies known to date, using HST/WFPC2 UBVI photometry, population synthesis models, and N-body/SPH simulations.We find that 69% of the clusters are younger than 7Myr, and that most of them are located in the ring or along the bar, consistent with the strong Halpha emission. The cluster luminosity function slope of 2.1-2.3 for NGC922 is in agreement with those of young clusters in nearby galaxies. Models of the cluster age distribution match the observations best when "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.0009","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":"2026-05-18T02:09:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0uiemtX06ka9vfZvgOgAzdVQCSiYmSeCaTQQWcelXZQdYGDDgxgfPmJUJIPt9NDXunrzdfCVpyX1s3122iKjBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T09:33:46.389400Z"},"content_sha256":"22f6d16edcfb8f5e8443977c7dcfeeba3dc93a1a5e2f9ad528a70aded559276e","schema_version":"1.0","event_id":"sha256:22f6d16edcfb8f5e8443977c7dcfeeba3dc93a1a5e2f9ad528a70aded559276e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/bundle.json","state_url":"https://pith.science/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/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":"2026-05-20T09:33:46Z","links":{"resolver":"https://pith.science/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG","bundle":"https://pith.science/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/bundle.json","state":"https://pith.science/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DNA5J7XTZ6BUDWEF4TFKKSLNDG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:DNA5J7XTZ6BUDWEF4TFKKSLNDG","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":"3c1062c1f2a1e37fff8853cde88d65fea03fa29fe06e97cd307b44100ebc21a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-01-29T21:10:27Z","title_canon_sha256":"555c0488dea859424dd42c4240465035967416c075fc270c4ff832537823147d"},"schema_version":"1.0","source":{"id":"1002.0009","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.0009","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"arxiv_version","alias_value":"1002.0009v1","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.0009","created_at":"2026-05-18T02:09:21Z"},{"alias_kind":"pith_short_12","alias_value":"DNA5J7XTZ6BU","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"DNA5J7XTZ6BUDWEF","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"DNA5J7XT","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:22f6d16edcfb8f5e8443977c7dcfeeba3dc93a1a5e2f9ad528a70aded559276e","target":"graph","created_at":"2026-05-18T02:09:21Z","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 present a detailed study of the star cluster population detected in the galaxy NGC922, one of the closest collisional ring galaxies known to date, using HST/WFPC2 UBVI photometry, population synthesis models, and N-body/SPH simulations.We find that 69% of the clusters are younger than 7Myr, and that most of them are located in the ring or along the bar, consistent with the strong Halpha emission. The cluster luminosity function slope of 2.1-2.3 for NGC922 is in agreement with those of young clusters in nearby galaxies. Models of the cluster age distribution match the observations best when ","authors_text":"Anne Pellerin, Debra M. Elmegreen, Gerhardt R. Meurer, Kenji Bekki, O. Ivy Wong, Patricia M. Knezek","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-01-29T21:10:27Z","title":"The Star Cluster Population of the Collisional Ring Galaxy NGC 922"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.0009","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":"sha256:9052a6d7065399aa786c98afefc4d6c0a40080600d57ea374002aceb42941903","target":"record","created_at":"2026-05-18T02:09:21Z","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":"3c1062c1f2a1e37fff8853cde88d65fea03fa29fe06e97cd307b44100ebc21a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-01-29T21:10:27Z","title_canon_sha256":"555c0488dea859424dd42c4240465035967416c075fc270c4ff832537823147d"},"schema_version":"1.0","source":{"id":"1002.0009","kind":"arxiv","version":1}},"canonical_sha256":"1b41d4fef3cf8341d885e4caa5496d1988a4902d1dd2bafa566d99e8ac5e528b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1b41d4fef3cf8341d885e4caa5496d1988a4902d1dd2bafa566d99e8ac5e528b","first_computed_at":"2026-05-18T02:09:21.933735Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:21.933735Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eAcW1yQMvUuczNxSpvfRxhGsM+8oEp3iBH1u4IA0bmcHwC+S7cc6t+Wq8tHqVV6FC4rL2OA8myP43cEw2A5PAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:21.934373Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.0009","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9052a6d7065399aa786c98afefc4d6c0a40080600d57ea374002aceb42941903","sha256:22f6d16edcfb8f5e8443977c7dcfeeba3dc93a1a5e2f9ad528a70aded559276e"],"state_sha256":"17ff5f572cef28903433ae0d529ef04ab69f3f9e3a1ad2031964512e19e6687f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NpoopjXdDx8tkSXjzRFtGtOroijxqbIY6YsjvVONOMQrzC84qh5rljiqFW2QeSx1upGlwacEegS7ZHTSaW85Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T09:33:46.391450Z","bundle_sha256":"4982e037e1814e4f140d62de7d9c3f782149b3893598c5a83345d10d84c21a63"}}