{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:ZHPRGXYBEHLN6FBY6FJOBOFIIW","short_pith_number":"pith:ZHPRGXYB","canonical_record":{"source":{"id":"1009.4198","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-21T20:01:15Z","cross_cats_sorted":[],"title_canon_sha256":"362ef02db2569510abd021ae1ced3c043aac77bf8c29af74daf903bf67c638c6","abstract_canon_sha256":"64511fc89f70a69074bcba45db978e6613b749de809d08d126c737e1c59736a0"},"schema_version":"1.0"},"canonical_sha256":"c9df135f0121d6df1438f152e0b8a84588b9eb19d3ce1f5febf523a6beab996b","source":{"kind":"arxiv","id":"1009.4198","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.4198","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"arxiv_version","alias_value":"1009.4198v1","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.4198","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"pith_short_12","alias_value":"ZHPRGXYBEHLN","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"ZHPRGXYBEHLN6FBY","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"ZHPRGXYB","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:ZHPRGXYBEHLN6FBY6FJOBOFIIW","target":"record","payload":{"canonical_record":{"source":{"id":"1009.4198","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-21T20:01:15Z","cross_cats_sorted":[],"title_canon_sha256":"362ef02db2569510abd021ae1ced3c043aac77bf8c29af74daf903bf67c638c6","abstract_canon_sha256":"64511fc89f70a69074bcba45db978e6613b749de809d08d126c737e1c59736a0"},"schema_version":"1.0"},"canonical_sha256":"c9df135f0121d6df1438f152e0b8a84588b9eb19d3ce1f5febf523a6beab996b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:19.042455Z","signature_b64":"coxH2PYT+eZHKkq1d8Mf+oE1lfbDeZ6thYPb4zCzrKNm1n19IKz76glG4zAbCH3dHiuqtZ1LIpeDW8wgTzkAAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c9df135f0121d6df1438f152e0b8a84588b9eb19d3ce1f5febf523a6beab996b","last_reissued_at":"2026-05-18T02:05:19.041912Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:19.041912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1009.4198","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":"2026-05-18T02:05:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0CGRCipw8MWl+07V4BZUNom4DkZ6wPAaIPOigf9iSM0/0ZGpn49JzXS/bLqnGRg3NmJoHZ6ASESsH0a+tl86Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T00:04:00.962500Z"},"content_sha256":"c1371e24c3b6c730c1fb3902b4f295100c6a96fc3d20e918b8799cbaab3bf420","schema_version":"1.0","event_id":"sha256:c1371e24c3b6c730c1fb3902b4f295100c6a96fc3d20e918b8799cbaab3bf420"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:ZHPRGXYBEHLN6FBY6FJOBOFIIW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dwarf galaxies beyond our doorstep: the Centaurus A group","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"(2) School of Mathematics & Physics, (3) Department of Physics, (4) European Southern Observatory, (5) Research School of Astronomy & Astrophysics, A. A. Cole (2), A. Koch (3), Astronomy, Australia, Australia), Australian National University, D. Crnojevi\\'c (1), E. K. Grebel (1), Garching, G. Da Costa (5), Germany, H. Jerjen (5) ((1) Astronomisches Rechen-Institut, Institute of Advanced Studies, M. Rejkuba (4), UK, University of Leicester, University of Tasmania, Zentrum fuer Astronomie der Universitaet Heidelberg","submitted_at":"2010-09-21T20:01:15Z","abstract_excerpt":"The study of dwarf galaxies in groups is a powerful tool for investigating galaxy evolution, chemical enrichment and environmental effects on these objects. Here we present results obtained for dwarf galaxies in the Centaurus A complex, a dense nearby (~4 Mpc) group that contains two giant galaxies and about 30 dwarf companions of different morphologies and stellar contents. We use archival optical (HST/ACS) and near-infrared (VLT/ISAAC) data to derive physical properties and evolutionary histories from the resolved stellar populations of these dwarf galaxies. In particular, for early-type dwa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.4198","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":"2026-05-18T02:05:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qAuRiRzzBTd3sylDSyI9pSsZh/iih6y2IRXeUpzfdkbj8pOYd7Kv22ze0u5/JBPxZR/9ML2IwwCf8PY+8Tw1Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T00:04:00.962859Z"},"content_sha256":"3c6df5b36dc23d7140f5afb8e5f0381867b60ffedc5fca3fbe18a438199e337c","schema_version":"1.0","event_id":"sha256:3c6df5b36dc23d7140f5afb8e5f0381867b60ffedc5fca3fbe18a438199e337c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/bundle.json","state_url":"https://pith.science/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/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":"2026-06-03T00:04:00Z","links":{"resolver":"https://pith.science/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW","bundle":"https://pith.science/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/bundle.json","state":"https://pith.science/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZHPRGXYBEHLN6FBY6FJOBOFIIW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:ZHPRGXYBEHLN6FBY6FJOBOFIIW","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":"64511fc89f70a69074bcba45db978e6613b749de809d08d126c737e1c59736a0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-21T20:01:15Z","title_canon_sha256":"362ef02db2569510abd021ae1ced3c043aac77bf8c29af74daf903bf67c638c6"},"schema_version":"1.0","source":{"id":"1009.4198","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.4198","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"arxiv_version","alias_value":"1009.4198v1","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.4198","created_at":"2026-05-18T02:05:19Z"},{"alias_kind":"pith_short_12","alias_value":"ZHPRGXYBEHLN","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"ZHPRGXYBEHLN6FBY","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"ZHPRGXYB","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:3c6df5b36dc23d7140f5afb8e5f0381867b60ffedc5fca3fbe18a438199e337c","target":"graph","created_at":"2026-05-18T02:05:19Z","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 study of dwarf galaxies in groups is a powerful tool for investigating galaxy evolution, chemical enrichment and environmental effects on these objects. Here we present results obtained for dwarf galaxies in the Centaurus A complex, a dense nearby (~4 Mpc) group that contains two giant galaxies and about 30 dwarf companions of different morphologies and stellar contents. We use archival optical (HST/ACS) and near-infrared (VLT/ISAAC) data to derive physical properties and evolutionary histories from the resolved stellar populations of these dwarf galaxies. In particular, for early-type dwa","authors_text":"(2) School of Mathematics & Physics, (3) Department of Physics, (4) European Southern Observatory, (5) Research School of Astronomy & Astrophysics, A. A. Cole (2), A. Koch (3), Astronomy, Australia, Australia), Australian National University, D. Crnojevi\\'c (1), E. K. Grebel (1), Garching, G. Da Costa (5), Germany, H. Jerjen (5) ((1) Astronomisches Rechen-Institut, Institute of Advanced Studies, M. Rejkuba (4), UK, University of Leicester, University of Tasmania, Zentrum fuer Astronomie der Universitaet Heidelberg","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-21T20:01:15Z","title":"Dwarf galaxies beyond our doorstep: the Centaurus A group"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.4198","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:c1371e24c3b6c730c1fb3902b4f295100c6a96fc3d20e918b8799cbaab3bf420","target":"record","created_at":"2026-05-18T02:05:19Z","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":"64511fc89f70a69074bcba45db978e6613b749de809d08d126c737e1c59736a0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-09-21T20:01:15Z","title_canon_sha256":"362ef02db2569510abd021ae1ced3c043aac77bf8c29af74daf903bf67c638c6"},"schema_version":"1.0","source":{"id":"1009.4198","kind":"arxiv","version":1}},"canonical_sha256":"c9df135f0121d6df1438f152e0b8a84588b9eb19d3ce1f5febf523a6beab996b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c9df135f0121d6df1438f152e0b8a84588b9eb19d3ce1f5febf523a6beab996b","first_computed_at":"2026-05-18T02:05:19.041912Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:19.041912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"coxH2PYT+eZHKkq1d8Mf+oE1lfbDeZ6thYPb4zCzrKNm1n19IKz76glG4zAbCH3dHiuqtZ1LIpeDW8wgTzkAAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:19.042455Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.4198","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c1371e24c3b6c730c1fb3902b4f295100c6a96fc3d20e918b8799cbaab3bf420","sha256:3c6df5b36dc23d7140f5afb8e5f0381867b60ffedc5fca3fbe18a438199e337c"],"state_sha256":"adecd62d5866a04f4aa02a3cb07f95b0f1622ab3e887ec7bee08d4248b7c0751"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EsELcZnF928qGzRAU3eV6uRK9jXL4HXeq1gCnjtou2xQZzf0vimDywKWNYg1l0TEChjjVUSXZ090a6q2yw/1CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T00:04:00.964912Z","bundle_sha256":"f1fc88860d47399a5e948bf12789851e9e358f178e07a3760953ee76c168de08"}}