{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:6CIUNHTW2YNRLSD4JIAGKDFNUT","short_pith_number":"pith:6CIUNHTW","canonical_record":{"source":{"id":"1909.00967","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T06:16:08Z","cross_cats_sorted":[],"title_canon_sha256":"51ac1fb6e08c1949f1dcb98f011e01a43d2b96ae2e225682e257c7200776aa04","abstract_canon_sha256":"bcf3a20700d0ecb16cba323faadd745a479c551581805d5164a64d4279834a15"},"schema_version":"1.0"},"canonical_sha256":"f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa","source":{"kind":"arxiv","id":"1909.00967","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.00967","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.00967v1","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.00967","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_12","alias_value":"6CIUNHTW2YNR","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_16","alias_value":"6CIUNHTW2YNRLSD4","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_8","alias_value":"6CIUNHTW","created_at":"2026-07-05T00:10:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:6CIUNHTW2YNRLSD4JIAGKDFNUT","target":"record","payload":{"canonical_record":{"source":{"id":"1909.00967","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T06:16:08Z","cross_cats_sorted":[],"title_canon_sha256":"51ac1fb6e08c1949f1dcb98f011e01a43d2b96ae2e225682e257c7200776aa04","abstract_canon_sha256":"bcf3a20700d0ecb16cba323faadd745a479c551581805d5164a64d4279834a15"},"schema_version":"1.0"},"canonical_sha256":"f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:10:43.069949Z","signature_b64":"FP9qwj1R5lON951/gwsULRO4/GcHxaLePkrymN+DhUlTp0msR8cic3WrZYBKPUQjo6uw2dABilw4A6PWAJvQAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa","last_reissued_at":"2026-07-05T00:10:43.069553Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:10:43.069553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.00967","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":"2026-07-05T00:10:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"717vm7WT1VuVUDwHGEetg/drif9ZU2kj1Ao/q5N5uwn14q/eASkme99bL2SFtEqygaZvo5bghg9+pczcKMCbDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T11:17:38.335687Z"},"content_sha256":"0a9d9502f7e912a8e3bd80f82c60a8d2b65d7459986d610b947374393f111585","schema_version":"1.0","event_id":"sha256:0a9d9502f7e912a8e3bd80f82c60a8d2b65d7459986d610b947374393f111585"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:6CIUNHTW2YNRLSD4JIAGKDFNUT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quasars Have Fewer Close Companions than Normal Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ian D. McGreer, Jan-Torge Schindler, Minghao Yue, Xiaohui Fan, Yun-Hsin Huang","submitted_at":"2019-09-03T06:16:08Z","abstract_excerpt":"We investigate the distribution of companion galaxies around quasars using {\\em Hubble Space Telescope} ({\\em HST}) Advanced Camera for Surveys Wide Field Camera (ACS/WFC) archival images. Our master sample contains 532 quasars which have been observed by {\\em HST} ACS/WFC, spanning a wide range of luminosity $(-31<M_i(z=2)<-23)$ and redshift ($0.3<z<3$). We search for companions around the quasars with projected distance of $10\\text{ kpc}<d<100\\text{ kpc}$. PSF subtraction is performed to enhance the completeness for close companions. The completeness is estimated to be high $(>90\\%)$ even fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.00967","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/1909.00967/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":"2026-07-05T00:10:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vZppuq7GN0yfX3woSrZEXuk18/X5s/YYMR3klb5giEI6RSj+yxF7Co4aCl0g8y1lKq+i4y3t7qW+sf3Igi0YAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T11:17:38.336256Z"},"content_sha256":"eb1634871652728289eebb68b33831978c8bf3071d3aa669fac29675eb89deab","schema_version":"1.0","event_id":"sha256:eb1634871652728289eebb68b33831978c8bf3071d3aa669fac29675eb89deab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/bundle.json","state_url":"https://pith.science/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/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":"2026-08-22T11:17:38Z","links":{"resolver":"https://pith.science/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT","bundle":"https://pith.science/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/bundle.json","state":"https://pith.science/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6CIUNHTW2YNRLSD4JIAGKDFNUT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:6CIUNHTW2YNRLSD4JIAGKDFNUT","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":"bcf3a20700d0ecb16cba323faadd745a479c551581805d5164a64d4279834a15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T06:16:08Z","title_canon_sha256":"51ac1fb6e08c1949f1dcb98f011e01a43d2b96ae2e225682e257c7200776aa04"},"schema_version":"1.0","source":{"id":"1909.00967","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.00967","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.00967v1","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.00967","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_12","alias_value":"6CIUNHTW2YNR","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_16","alias_value":"6CIUNHTW2YNRLSD4","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_8","alias_value":"6CIUNHTW","created_at":"2026-07-05T00:10:43Z"}],"graph_snapshots":[{"event_id":"sha256:eb1634871652728289eebb68b33831978c8bf3071d3aa669fac29675eb89deab","target":"graph","created_at":"2026-07-05T00:10:43Z","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/1909.00967/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate the distribution of companion galaxies around quasars using {\\em Hubble Space Telescope} ({\\em HST}) Advanced Camera for Surveys Wide Field Camera (ACS/WFC) archival images. Our master sample contains 532 quasars which have been observed by {\\em HST} ACS/WFC, spanning a wide range of luminosity $(-31<M_i(z=2)<-23)$ and redshift ($0.3<z<3$). We search for companions around the quasars with projected distance of $10\\text{ kpc}<d<100\\text{ kpc}$. PSF subtraction is performed to enhance the completeness for close companions. The completeness is estimated to be high $(>90\\%)$ even fo","authors_text":"Ian D. McGreer, Jan-Torge Schindler, Minghao Yue, Xiaohui Fan, Yun-Hsin Huang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T06:16:08Z","title":"Quasars Have Fewer Close Companions than Normal Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.00967","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":"sha256:0a9d9502f7e912a8e3bd80f82c60a8d2b65d7459986d610b947374393f111585","target":"record","created_at":"2026-07-05T00:10:43Z","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":"bcf3a20700d0ecb16cba323faadd745a479c551581805d5164a64d4279834a15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-09-03T06:16:08Z","title_canon_sha256":"51ac1fb6e08c1949f1dcb98f011e01a43d2b96ae2e225682e257c7200776aa04"},"schema_version":"1.0","source":{"id":"1909.00967","kind":"arxiv","version":1}},"canonical_sha256":"f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f091469e76d61b15c87c4a00650cada4fe52d7bfff45b979612071ddf7b623fa","first_computed_at":"2026-07-05T00:10:43.069553Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:10:43.069553Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FP9qwj1R5lON951/gwsULRO4/GcHxaLePkrymN+DhUlTp0msR8cic3WrZYBKPUQjo6uw2dABilw4A6PWAJvQAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:10:43.069949Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.00967","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0a9d9502f7e912a8e3bd80f82c60a8d2b65d7459986d610b947374393f111585","sha256:eb1634871652728289eebb68b33831978c8bf3071d3aa669fac29675eb89deab"],"state_sha256":"94b7ca1fa3d260eb4fcd3310717f9a99bff83b1afabfb565ba226aba6ee8edff"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QgPgMuOs4YpytTkeJU5D3w+L4+9tjvFTM86vtNzePw7D3ebcwMEzlPenfv5FOXrcYiHggfjv/lQ2UNJIss31BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T11:17:38.341709Z","bundle_sha256":"cfe06b4b965712391cc652b08f6599888a9cb78cbe9e2339d6472083232cb7be"}}