{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:MNCYARBBB3VIR6QRQ73F2HESMJ","short_pith_number":"pith:MNCYARBB","canonical_record":{"source":{"id":"1909.13301","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-09-29T15:35:00Z","cross_cats_sorted":[],"title_canon_sha256":"71ee225b20e914cb66927c9c0920992ec7f9fbd9adb26adc173b536da38c3c61","abstract_canon_sha256":"1a68021f56b0392eeae26ef92584c7dd18ffdebb77efcfa797545bb7c4a74c17"},"schema_version":"1.0"},"canonical_sha256":"63458044210eea88fa1187f65d1c926244da837f4fb6b14e65bc232e342a795c","source":{"kind":"arxiv","id":"1909.13301","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.13301","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"arxiv_version","alias_value":"1909.13301v2","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.13301","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_12","alias_value":"MNCYARBBB3VI","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_16","alias_value":"MNCYARBBB3VIR6QR","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_8","alias_value":"MNCYARBB","created_at":"2026-07-05T01:00:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:MNCYARBBB3VIR6QRQ73F2HESMJ","target":"record","payload":{"canonical_record":{"source":{"id":"1909.13301","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-09-29T15:35:00Z","cross_cats_sorted":[],"title_canon_sha256":"71ee225b20e914cb66927c9c0920992ec7f9fbd9adb26adc173b536da38c3c61","abstract_canon_sha256":"1a68021f56b0392eeae26ef92584c7dd18ffdebb77efcfa797545bb7c4a74c17"},"schema_version":"1.0"},"canonical_sha256":"63458044210eea88fa1187f65d1c926244da837f4fb6b14e65bc232e342a795c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:00:34.466667Z","signature_b64":"//5cJLzearV9oLFcyo4nIe2tDy9lBQqSMDKwhb9MIZEPa905vA+X5wtU4mGu/PgtYvtL5vSposooLQHneFXzBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63458044210eea88fa1187f65d1c926244da837f4fb6b14e65bc232e342a795c","last_reissued_at":"2026-07-05T01:00:34.466175Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:00:34.466175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.13301","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":"2026-07-05T01:00:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SJPVSJhZl15lSOBwNl6irCWU+EtJ9og3r0F/2zWbG5WnoHSfshcO7aUovUPqODaHEoyrQDjeOWwVFOTrlwPaDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T03:40:45.483976Z"},"content_sha256":"f67b5030d9df0931c2517e9dd678ea70d134d6024618a797e661eb13d0763bb1","schema_version":"1.0","event_id":"sha256:f67b5030d9df0931c2517e9dd678ea70d134d6024618a797e661eb13d0763bb1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:MNCYARBBB3VIR6QRQ73F2HESMJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HIKER: a halo-finding method based on kernel-shift algorithm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Liang Gao, Qiao Wang, Qi Guo, Shihong Liao, Shuangpeng Sun","submitted_at":"2019-09-29T15:35:00Z","abstract_excerpt":"We introduce a new halo/subhalo finder, HIKER (a Halo fInder based on KERnel-shift algorithm), which takes advantage of a machine learning method -- the mean-shift algorithm combined with the Plummer kernel function, to effectively locate density peaks corresponding to halos/subhalos in density field. Based on these density peaks, dark matter halos are identified as spherical overdensity structures, and subhalos are bound substructures with boundaries at their tidal radius. By testing HIKER code with mock halos, we show that HIKER performs excellently in recovering input halo properties. Espec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.13301","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.13301/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":"2026-07-05T01:00:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LNfo+pRa9N0QxZDGFHSVHzKFLbqCh7E47JkOMoUItr8yAX9J0CDgqpIKeeb1IZdgIp6m1YskB73a2tXJS/BvDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T03:40:45.484375Z"},"content_sha256":"4be057ad2857cfeaebd22d48ad1eb8f0dac9c91ccf69be4b236f94bd556987ad","schema_version":"1.0","event_id":"sha256:4be057ad2857cfeaebd22d48ad1eb8f0dac9c91ccf69be4b236f94bd556987ad"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/bundle.json","state_url":"https://pith.science/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/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":"2026-08-13T03:40:45Z","links":{"resolver":"https://pith.science/pith/MNCYARBBB3VIR6QRQ73F2HESMJ","bundle":"https://pith.science/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/bundle.json","state":"https://pith.science/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MNCYARBBB3VIR6QRQ73F2HESMJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:MNCYARBBB3VIR6QRQ73F2HESMJ","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":"1a68021f56b0392eeae26ef92584c7dd18ffdebb77efcfa797545bb7c4a74c17","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-09-29T15:35:00Z","title_canon_sha256":"71ee225b20e914cb66927c9c0920992ec7f9fbd9adb26adc173b536da38c3c61"},"schema_version":"1.0","source":{"id":"1909.13301","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.13301","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"arxiv_version","alias_value":"1909.13301v2","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.13301","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_12","alias_value":"MNCYARBBB3VI","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_16","alias_value":"MNCYARBBB3VIR6QR","created_at":"2026-07-05T01:00:34Z"},{"alias_kind":"pith_short_8","alias_value":"MNCYARBB","created_at":"2026-07-05T01:00:34Z"}],"graph_snapshots":[{"event_id":"sha256:4be057ad2857cfeaebd22d48ad1eb8f0dac9c91ccf69be4b236f94bd556987ad","target":"graph","created_at":"2026-07-05T01:00:34Z","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/1909.13301/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We introduce a new halo/subhalo finder, HIKER (a Halo fInder based on KERnel-shift algorithm), which takes advantage of a machine learning method -- the mean-shift algorithm combined with the Plummer kernel function, to effectively locate density peaks corresponding to halos/subhalos in density field. Based on these density peaks, dark matter halos are identified as spherical overdensity structures, and subhalos are bound substructures with boundaries at their tidal radius. By testing HIKER code with mock halos, we show that HIKER performs excellently in recovering input halo properties. Espec","authors_text":"Liang Gao, Qiao Wang, Qi Guo, Shihong Liao, Shuangpeng Sun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-09-29T15:35:00Z","title":"HIKER: a halo-finding method based on kernel-shift algorithm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.13301","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:f67b5030d9df0931c2517e9dd678ea70d134d6024618a797e661eb13d0763bb1","target":"record","created_at":"2026-07-05T01:00:34Z","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":"1a68021f56b0392eeae26ef92584c7dd18ffdebb77efcfa797545bb7c4a74c17","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-09-29T15:35:00Z","title_canon_sha256":"71ee225b20e914cb66927c9c0920992ec7f9fbd9adb26adc173b536da38c3c61"},"schema_version":"1.0","source":{"id":"1909.13301","kind":"arxiv","version":2}},"canonical_sha256":"63458044210eea88fa1187f65d1c926244da837f4fb6b14e65bc232e342a795c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63458044210eea88fa1187f65d1c926244da837f4fb6b14e65bc232e342a795c","first_computed_at":"2026-07-05T01:00:34.466175Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:00:34.466175Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"//5cJLzearV9oLFcyo4nIe2tDy9lBQqSMDKwhb9MIZEPa905vA+X5wtU4mGu/PgtYvtL5vSposooLQHneFXzBA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:00:34.466667Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.13301","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f67b5030d9df0931c2517e9dd678ea70d134d6024618a797e661eb13d0763bb1","sha256:4be057ad2857cfeaebd22d48ad1eb8f0dac9c91ccf69be4b236f94bd556987ad"],"state_sha256":"a3904b42db6d2a421f92c9338cb8466bd91d0a9fb50e23e9d58a0ea9ee5b61ff"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4eCJpUWXuDs5cXOSPI9wbcmqa26AkKx59fzaRbHZQEd+OSww7F7TkQ8KrwgA1d+s6/bpACAVji4XArh0SInLBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T03:40:45.487380Z","bundle_sha256":"10e28a6f1d5055c1b4b04701ab4f6beb82d5d19bc8f15607397b942cbb115b16"}}