{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:DMGRDVSF7XFRLHEQSI5V5NNRFH","short_pith_number":"pith:DMGRDVSF","canonical_record":{"source":{"id":"1708.07127","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-23T18:00:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"98233805e857bf78470ad7dfbbb9a2dc410ac2d2518ae4e4b64b1f78aae3d1bb","abstract_canon_sha256":"04db0e551d78e9ab6037ada70bfba85f1ea1e2fe362cfe0f4b9aaf48de3496ae"},"schema_version":"1.0"},"canonical_sha256":"1b0d11d645fdcb159c90923b5eb5b129e10f118da5ae67872f9441ee3026c190","source":{"kind":"arxiv","id":"1708.07127","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.07127","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"arxiv_version","alias_value":"1708.07127v2","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.07127","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"pith_short_12","alias_value":"DMGRDVSF7XFR","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"DMGRDVSF7XFRLHEQ","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"DMGRDVSF","created_at":"2026-05-18T12:31:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:DMGRDVSF7XFRLHEQSI5V5NNRFH","target":"record","payload":{"canonical_record":{"source":{"id":"1708.07127","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-23T18:00:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"98233805e857bf78470ad7dfbbb9a2dc410ac2d2518ae4e4b64b1f78aae3d1bb","abstract_canon_sha256":"04db0e551d78e9ab6037ada70bfba85f1ea1e2fe362cfe0f4b9aaf48de3496ae"},"schema_version":"1.0"},"canonical_sha256":"1b0d11d645fdcb159c90923b5eb5b129e10f118da5ae67872f9441ee3026c190","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:26:49.251492Z","signature_b64":"5vRaXi0DBf0vSdBO3ytlZX1bJeOOOSOgFlOZLkzH5SbjPmoYSBHukehZsoGkuzPV9zVpuEIuBl8ZyFO1ruWKAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1b0d11d645fdcb159c90923b5eb5b129e10f118da5ae67872f9441ee3026c190","last_reissued_at":"2026-05-18T00:26:49.250881Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:26:49.250881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.07127","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":"2026-05-18T00:26:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jIC/36po5X15yfZ1Vmwc8i0C6LnLyg765mlJPCFfCktFkzwsa/56Avw8+7F6Ov8TrRVZlbnjmJEAUgz6D1NLCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T17:51:10.355725Z"},"content_sha256":"b801de635fe80ef0fb70ccbf406a0e8f54bc8554344fed94324813e6d02fef84","schema_version":"1.0","event_id":"sha256:b801de635fe80ef0fb70ccbf406a0e8f54bc8554344fed94324813e6d02fef84"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:DMGRDVSF7XFRLHEQSI5V5NNRFH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The formation of UCDs and massive GCs: Quasar-like objects for testing for a variable stellar initial mass function (IMF)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Joerg Dabringhausen, Kenji Bekki, Michael Hilker, Pavel Kroupa, Tereza Jerabkova","submitted_at":"2017-08-23T18:00:02Z","abstract_excerpt":"The stellar initial mas function (IMF) has been described as being invariant, bottom heavy or top-heavy in extremely dense star burst conditions. To provide usable observable diagnostic we calculate redshift dependent spectral energy distributions of stellar populations in extreme star burst clusters which are likely to have been the precursors of present day massive globular clusters (GCs) and of ultra compact dwarf galaxies (UCDs). The retention fraction of stellar remnants is taken into account to asses the mass to light ratios of the ageing star-burst. Their redshift dependent photometric "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.07127","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":"2026-05-18T00:26:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5oo3wyQAhdQytvoE9HgQZfwo/mhHwlipWJbVeFLWMOqc/J5r6sUdy0/Ttv4mDASht/0ZhN+OH+r+Oe/SLwk0Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T17:51:10.356106Z"},"content_sha256":"a702ecafab321ea884c1d7158290a259b87d309895f5b328d247f3943e4d4f07","schema_version":"1.0","event_id":"sha256:a702ecafab321ea884c1d7158290a259b87d309895f5b328d247f3943e4d4f07"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/bundle.json","state_url":"https://pith.science/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/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":"2026-05-19T17:51:10Z","links":{"resolver":"https://pith.science/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH","bundle":"https://pith.science/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/bundle.json","state":"https://pith.science/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DMGRDVSF7XFRLHEQSI5V5NNRFH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:DMGRDVSF7XFRLHEQSI5V5NNRFH","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":"04db0e551d78e9ab6037ada70bfba85f1ea1e2fe362cfe0f4b9aaf48de3496ae","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-23T18:00:02Z","title_canon_sha256":"98233805e857bf78470ad7dfbbb9a2dc410ac2d2518ae4e4b64b1f78aae3d1bb"},"schema_version":"1.0","source":{"id":"1708.07127","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.07127","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"arxiv_version","alias_value":"1708.07127v2","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.07127","created_at":"2026-05-18T00:26:49Z"},{"alias_kind":"pith_short_12","alias_value":"DMGRDVSF7XFR","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"DMGRDVSF7XFRLHEQ","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"DMGRDVSF","created_at":"2026-05-18T12:31:10Z"}],"graph_snapshots":[{"event_id":"sha256:a702ecafab321ea884c1d7158290a259b87d309895f5b328d247f3943e4d4f07","target":"graph","created_at":"2026-05-18T00:26:49Z","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 initial mas function (IMF) has been described as being invariant, bottom heavy or top-heavy in extremely dense star burst conditions. To provide usable observable diagnostic we calculate redshift dependent spectral energy distributions of stellar populations in extreme star burst clusters which are likely to have been the precursors of present day massive globular clusters (GCs) and of ultra compact dwarf galaxies (UCDs). The retention fraction of stellar remnants is taken into account to asses the mass to light ratios of the ageing star-burst. Their redshift dependent photometric ","authors_text":"Joerg Dabringhausen, Kenji Bekki, Michael Hilker, Pavel Kroupa, Tereza Jerabkova","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-23T18:00:02Z","title":"The formation of UCDs and massive GCs: Quasar-like objects for testing for a variable stellar initial mass function (IMF)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.07127","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:b801de635fe80ef0fb70ccbf406a0e8f54bc8554344fed94324813e6d02fef84","target":"record","created_at":"2026-05-18T00:26:49Z","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":"04db0e551d78e9ab6037ada70bfba85f1ea1e2fe362cfe0f4b9aaf48de3496ae","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-08-23T18:00:02Z","title_canon_sha256":"98233805e857bf78470ad7dfbbb9a2dc410ac2d2518ae4e4b64b1f78aae3d1bb"},"schema_version":"1.0","source":{"id":"1708.07127","kind":"arxiv","version":2}},"canonical_sha256":"1b0d11d645fdcb159c90923b5eb5b129e10f118da5ae67872f9441ee3026c190","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1b0d11d645fdcb159c90923b5eb5b129e10f118da5ae67872f9441ee3026c190","first_computed_at":"2026-05-18T00:26:49.250881Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:26:49.250881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5vRaXi0DBf0vSdBO3ytlZX1bJeOOOSOgFlOZLkzH5SbjPmoYSBHukehZsoGkuzPV9zVpuEIuBl8ZyFO1ruWKAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:26:49.251492Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.07127","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b801de635fe80ef0fb70ccbf406a0e8f54bc8554344fed94324813e6d02fef84","sha256:a702ecafab321ea884c1d7158290a259b87d309895f5b328d247f3943e4d4f07"],"state_sha256":"2dfef5b82d8e17deeec21be61d258b17b39421756b64a816fcf66b5fd97c508e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Uq49t+OoxHqAw9OarklihAgn1XhuXNp6dvZLgRd2G6Iqnc6Eel1TsaGYXD+5KgI57huz33RDjXlkTLAkZnC6BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T17:51:10.359339Z","bundle_sha256":"b03eaef7c65d083ca3a84a7aba471a2eb5bbe0e5a3778e3bf1ca968c8a472fd5"}}