{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:4GLR6DB3JVU6437RWABZ6N7GWH","short_pith_number":"pith:4GLR6DB3","canonical_record":{"source":{"id":"1108.0946","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-03T20:26:49Z","cross_cats_sorted":[],"title_canon_sha256":"a8ca765831b8c49e8114df98355a99a9e71735f2ae593b74e61b34b542cd5854","abstract_canon_sha256":"0b38ccfb77044141d7dda5e273de91a9b186938ecc9cda4e50638fd8b264bca5"},"schema_version":"1.0"},"canonical_sha256":"e1971f0c3b4d69ee6ff1b0039f37e6b1c6e4ba22147edb5c94e5074452b645f7","source":{"kind":"arxiv","id":"1108.0946","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.0946","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"arxiv_version","alias_value":"1108.0946v1","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.0946","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"pith_short_12","alias_value":"4GLR6DB3JVU6","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4GLR6DB3JVU6437R","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4GLR6DB3","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:4GLR6DB3JVU6437RWABZ6N7GWH","target":"record","payload":{"canonical_record":{"source":{"id":"1108.0946","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-03T20:26:49Z","cross_cats_sorted":[],"title_canon_sha256":"a8ca765831b8c49e8114df98355a99a9e71735f2ae593b74e61b34b542cd5854","abstract_canon_sha256":"0b38ccfb77044141d7dda5e273de91a9b186938ecc9cda4e50638fd8b264bca5"},"schema_version":"1.0"},"canonical_sha256":"e1971f0c3b4d69ee6ff1b0039f37e6b1c6e4ba22147edb5c94e5074452b645f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:03.275537Z","signature_b64":"R5ZA5xQQJiAIErGrnCPah8RNtcsi+rv83P68hMrZsVtgv+nu5V+MUg2u57bstyR86tWsFH8+bJgu612nKiEWDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e1971f0c3b4d69ee6ff1b0039f37e6b1c6e4ba22147edb5c94e5074452b645f7","last_reissued_at":"2026-05-18T02:01:03.274907Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:03.274907Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.0946","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":"2026-05-18T02:01:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GH7C4wxP1U4qTwuVM/wflvP4Ks1D5i/PlkEYO1nw/QJakHYnBtVtNvTgWeWpBIVhbLjBN/1HGV7ZLcRPR+4uCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:11:37.356547Z"},"content_sha256":"47170846b69de65a5e6ce36ab3f7dea3de7ff507910b4f2b7c1d5785659281c7","schema_version":"1.0","event_id":"sha256:47170846b69de65a5e6ce36ab3f7dea3de7ff507910b4f2b7c1d5785659281c7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:4GLR6DB3JVU6437RWABZ6N7GWH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Radial Stellar Content of Early-Type Galaxies as a Function of Mass and Environment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Pasquali, F. La Barbera, G. De Lucia, I. Ferreras, I.G. de la Rosa, P.A.A. Lopes, R.R. de Carvalho","submitted_at":"2011-08-03T20:26:49Z","abstract_excerpt":"Using optical-optical and optical-NIR colors, we analyze the radial dependence of age and metallicity inside massive (M* > 10^10.5 MSun), low-redshift (z<0.1), early-type galaxies (ETGs), residing in both high-density group regions and the field. On average, internal color gradients of ETGs are mainly driven by metallicity, consistent with previous studies. However, we find that group galaxies feature positive age gradients, Nabla_t, i.e. a younger stellar population in the galaxy center, and steeper metallicity gradients, compared to the field sample, whose Nabla_t ranges from negative in low"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.0946","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":"2026-05-18T02:01:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xrVrtd4ejty9f36T8/q8v9s2mYfW/Cnbq8zHgxMYCb9teBZDLr5DRih81eNui5GiSfG2Xa7wl0qXnzW+UYmHCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T13:11:37.356901Z"},"content_sha256":"3b7c680e4f6604ac9f49f6eeff5a6aab92907d9cae21cad426decf61b914fd21","schema_version":"1.0","event_id":"sha256:3b7c680e4f6604ac9f49f6eeff5a6aab92907d9cae21cad426decf61b914fd21"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4GLR6DB3JVU6437RWABZ6N7GWH/bundle.json","state_url":"https://pith.science/pith/4GLR6DB3JVU6437RWABZ6N7GWH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4GLR6DB3JVU6437RWABZ6N7GWH/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":"2026-05-28T13:11:37Z","links":{"resolver":"https://pith.science/pith/4GLR6DB3JVU6437RWABZ6N7GWH","bundle":"https://pith.science/pith/4GLR6DB3JVU6437RWABZ6N7GWH/bundle.json","state":"https://pith.science/pith/4GLR6DB3JVU6437RWABZ6N7GWH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4GLR6DB3JVU6437RWABZ6N7GWH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:4GLR6DB3JVU6437RWABZ6N7GWH","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":"0b38ccfb77044141d7dda5e273de91a9b186938ecc9cda4e50638fd8b264bca5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-03T20:26:49Z","title_canon_sha256":"a8ca765831b8c49e8114df98355a99a9e71735f2ae593b74e61b34b542cd5854"},"schema_version":"1.0","source":{"id":"1108.0946","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.0946","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"arxiv_version","alias_value":"1108.0946v1","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.0946","created_at":"2026-05-18T02:01:03Z"},{"alias_kind":"pith_short_12","alias_value":"4GLR6DB3JVU6","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"4GLR6DB3JVU6437R","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"4GLR6DB3","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:3b7c680e4f6604ac9f49f6eeff5a6aab92907d9cae21cad426decf61b914fd21","target":"graph","created_at":"2026-05-18T02:01:03Z","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":"Using optical-optical and optical-NIR colors, we analyze the radial dependence of age and metallicity inside massive (M* > 10^10.5 MSun), low-redshift (z<0.1), early-type galaxies (ETGs), residing in both high-density group regions and the field. On average, internal color gradients of ETGs are mainly driven by metallicity, consistent with previous studies. However, we find that group galaxies feature positive age gradients, Nabla_t, i.e. a younger stellar population in the galaxy center, and steeper metallicity gradients, compared to the field sample, whose Nabla_t ranges from negative in low","authors_text":"A. Pasquali, F. La Barbera, G. De Lucia, I. Ferreras, I.G. de la Rosa, P.A.A. Lopes, R.R. de Carvalho","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-03T20:26:49Z","title":"On the Radial Stellar Content of Early-Type Galaxies as a Function of Mass and Environment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.0946","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":"sha256:47170846b69de65a5e6ce36ab3f7dea3de7ff507910b4f2b7c1d5785659281c7","target":"record","created_at":"2026-05-18T02:01:03Z","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":"0b38ccfb77044141d7dda5e273de91a9b186938ecc9cda4e50638fd8b264bca5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-03T20:26:49Z","title_canon_sha256":"a8ca765831b8c49e8114df98355a99a9e71735f2ae593b74e61b34b542cd5854"},"schema_version":"1.0","source":{"id":"1108.0946","kind":"arxiv","version":1}},"canonical_sha256":"e1971f0c3b4d69ee6ff1b0039f37e6b1c6e4ba22147edb5c94e5074452b645f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1971f0c3b4d69ee6ff1b0039f37e6b1c6e4ba22147edb5c94e5074452b645f7","first_computed_at":"2026-05-18T02:01:03.274907Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:03.274907Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"R5ZA5xQQJiAIErGrnCPah8RNtcsi+rv83P68hMrZsVtgv+nu5V+MUg2u57bstyR86tWsFH8+bJgu612nKiEWDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:03.275537Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.0946","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47170846b69de65a5e6ce36ab3f7dea3de7ff507910b4f2b7c1d5785659281c7","sha256:3b7c680e4f6604ac9f49f6eeff5a6aab92907d9cae21cad426decf61b914fd21"],"state_sha256":"d09be37c346f8f1e97d8f464770a45d2ec8a7e779450feb28f6e447b7df1f95b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KL6pn1a63RtLhrY5qKm1tRolp0hG/6KNHdC93hZPliT4L9mQdX+2FEKMP7sq43QeKb84GqkyLXYDRVsnE1QHBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T13:11:37.359008Z","bundle_sha256":"6b490a17a90942aa149d16da6aebcc180eb91192d9c6e614df9623432dc5e4c0"}}