{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:KVY2NJ5JRGLRK7RJCT752Q3PRV","short_pith_number":"pith:KVY2NJ5J","canonical_record":{"source":{"id":"2102.06703","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-12T18:59:04Z","cross_cats_sorted":[],"title_canon_sha256":"219afb081ac9a0e44f88b1a0fceaa607d2a949b4bdfe6052bb26bbf0a023ea27","abstract_canon_sha256":"82ae883586ad0c310dbb3f78675d6d42e6244a1f97ec2eb6dfd22c68b7d31f5b"},"schema_version":"1.0"},"canonical_sha256":"5571a6a7a98997157e2914ffdd436f8d71aa776dddb086162bcd873d8d08e055","source":{"kind":"arxiv","id":"2102.06703","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.06703","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"arxiv_version","alias_value":"2102.06703v1","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.06703","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_12","alias_value":"KVY2NJ5JRGLR","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_16","alias_value":"KVY2NJ5JRGLRK7RJ","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_8","alias_value":"KVY2NJ5J","created_at":"2026-07-05T02:21:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:KVY2NJ5JRGLRK7RJCT752Q3PRV","target":"record","payload":{"canonical_record":{"source":{"id":"2102.06703","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-12T18:59:04Z","cross_cats_sorted":[],"title_canon_sha256":"219afb081ac9a0e44f88b1a0fceaa607d2a949b4bdfe6052bb26bbf0a023ea27","abstract_canon_sha256":"82ae883586ad0c310dbb3f78675d6d42e6244a1f97ec2eb6dfd22c68b7d31f5b"},"schema_version":"1.0"},"canonical_sha256":"5571a6a7a98997157e2914ffdd436f8d71aa776dddb086162bcd873d8d08e055","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:21:01.129636Z","signature_b64":"9ir5ZAV0Q4qwTFWkU5ugipbP9sn5yDEftKTXnYJDeiN/nfwhCtqWsgZBWTAWDMi8LC3k0n7iMvvbR9ZyvHSHAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5571a6a7a98997157e2914ffdd436f8d71aa776dddb086162bcd873d8d08e055","last_reissued_at":"2026-07-05T02:21:01.129103Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:21:01.129103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.06703","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":"2026-07-05T02:21:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nl3joyGW3GIyRTQOtoNHdDYGzGwoXdIFrFJXFeCUxL7wu1cjixdk7LCz1kzJIuqSH3UjWeDI2vphigb6ceQZCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:43:26.473974Z"},"content_sha256":"54ad816d00037b3b00e3a11f6b1628eafc2fff19fd6ae8014f12c3bcac57a5d9","schema_version":"1.0","event_id":"sha256:54ad816d00037b3b00e3a11f6b1628eafc2fff19fd6ae8014f12c3bcac57a5d9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:KVY2NJ5JRGLRK7RJCT752Q3PRV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SDSS-IV MaNGA: Radial Gradients in Stellar Population Properties of Early-Type and Late-Type Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Brett H. Andrews, Claudia Maraston, Daniel Thomas, Grecco Oyarzun, Kyle B. Westfall, Nicholas Fraser Boardman, Niv Drory, Taniya Parikh","submitted_at":"2021-02-12T18:59:04Z","abstract_excerpt":"We derive ages, metallicities, and individual element abundances of early- and late-type galaxies (ETGs and LTGs) out to 1.5 R$_e$. We study a large sample of 1900 galaxies spanning $8.6 - 11.3 \\log M/M_{\\odot}$ in stellar mass, through key absorption features in stacked spectra from the SDSS-IV/MaNGA survey. We use mock galaxy spectra with extended star formation histories to validate our method for LTGs and use corrections to convert the derived ages into luminosity- and mass-weighted quantities. We find flat age and negative metallicity gradients for ETGs and negative age and negative metal"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.06703","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2102.06703/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:21:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"enb6bqcDcCG8Slyg56MMz55ez++hjYsGZTfnXPggmMq+UYiTD9WxG8gQN6oAN1m5NBX/Dw160JvMgIbadTl6Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:43:26.474732Z"},"content_sha256":"31495926ef86c619d006fcaa2fb88b309b51cfa191284211b42bece195e2adf5","schema_version":"1.0","event_id":"sha256:31495926ef86c619d006fcaa2fb88b309b51cfa191284211b42bece195e2adf5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/bundle.json","state_url":"https://pith.science/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/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":"2026-08-05T19:43:26Z","links":{"resolver":"https://pith.science/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV","bundle":"https://pith.science/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/bundle.json","state":"https://pith.science/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KVY2NJ5JRGLRK7RJCT752Q3PRV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:KVY2NJ5JRGLRK7RJCT752Q3PRV","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":"82ae883586ad0c310dbb3f78675d6d42e6244a1f97ec2eb6dfd22c68b7d31f5b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-12T18:59:04Z","title_canon_sha256":"219afb081ac9a0e44f88b1a0fceaa607d2a949b4bdfe6052bb26bbf0a023ea27"},"schema_version":"1.0","source":{"id":"2102.06703","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.06703","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"arxiv_version","alias_value":"2102.06703v1","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.06703","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_12","alias_value":"KVY2NJ5JRGLR","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_16","alias_value":"KVY2NJ5JRGLRK7RJ","created_at":"2026-07-05T02:21:01Z"},{"alias_kind":"pith_short_8","alias_value":"KVY2NJ5J","created_at":"2026-07-05T02:21:01Z"}],"graph_snapshots":[{"event_id":"sha256:31495926ef86c619d006fcaa2fb88b309b51cfa191284211b42bece195e2adf5","target":"graph","created_at":"2026-07-05T02:21:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2102.06703/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We derive ages, metallicities, and individual element abundances of early- and late-type galaxies (ETGs and LTGs) out to 1.5 R$_e$. We study a large sample of 1900 galaxies spanning $8.6 - 11.3 \\log M/M_{\\odot}$ in stellar mass, through key absorption features in stacked spectra from the SDSS-IV/MaNGA survey. We use mock galaxy spectra with extended star formation histories to validate our method for LTGs and use corrections to convert the derived ages into luminosity- and mass-weighted quantities. We find flat age and negative metallicity gradients for ETGs and negative age and negative metal","authors_text":"Brett H. Andrews, Claudia Maraston, Daniel Thomas, Grecco Oyarzun, Kyle B. Westfall, Nicholas Fraser Boardman, Niv Drory, Taniya Parikh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-12T18:59:04Z","title":"SDSS-IV MaNGA: Radial Gradients in Stellar Population Properties of Early-Type and Late-Type Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.06703","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":"sha256:54ad816d00037b3b00e3a11f6b1628eafc2fff19fd6ae8014f12c3bcac57a5d9","target":"record","created_at":"2026-07-05T02:21:01Z","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":"82ae883586ad0c310dbb3f78675d6d42e6244a1f97ec2eb6dfd22c68b7d31f5b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-02-12T18:59:04Z","title_canon_sha256":"219afb081ac9a0e44f88b1a0fceaa607d2a949b4bdfe6052bb26bbf0a023ea27"},"schema_version":"1.0","source":{"id":"2102.06703","kind":"arxiv","version":1}},"canonical_sha256":"5571a6a7a98997157e2914ffdd436f8d71aa776dddb086162bcd873d8d08e055","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5571a6a7a98997157e2914ffdd436f8d71aa776dddb086162bcd873d8d08e055","first_computed_at":"2026-07-05T02:21:01.129103Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:21:01.129103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9ir5ZAV0Q4qwTFWkU5ugipbP9sn5yDEftKTXnYJDeiN/nfwhCtqWsgZBWTAWDMi8LC3k0n7iMvvbR9ZyvHSHAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:21:01.129636Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.06703","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:54ad816d00037b3b00e3a11f6b1628eafc2fff19fd6ae8014f12c3bcac57a5d9","sha256:31495926ef86c619d006fcaa2fb88b309b51cfa191284211b42bece195e2adf5"],"state_sha256":"fa6a0e652de264729f6dbab216f91d24c0d2536160f652e3445a92211244ff77"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l9xOOokMf87hJSoyeq0nAsXVRAjvC+X0cHJAzUdPigS3zYBDXcBm5e5sNfW10hgFfSJQ9DxjiLQ/RKxU52m7AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T19:43:26.481781Z","bundle_sha256":"07ca4daf5b4271b936685f4c86648ee7ea98466b7f16ebad5fa4ae93458ed43e"}}