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Therefore, one can expect that there is a close connection between active EMBHs and dense environments. Here, we study the environments of 9461 galaxies and 2943 quasars at $0.24 \\le z \\le 0.40$, among which 52 are extremely massive quasars with $\\log(M_\\mathrm{BH}/M_{\\odot}) \\ge 9.4$, using Sloan Digital Sky Surve"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1901.02267","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-01-08T11:51:51Z","cross_cats_sorted":[],"title_canon_sha256":"1ea43aeb582cbaba41b8f49abcbba4101cb4c4df0ba920eeb619e0d3e27019a0","abstract_canon_sha256":"408960e6abf22da7dc4e2cea4e88fa17c09d28a2e4730ee6d86acc7a54b6c986"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:10.320594Z","signature_b64":"aekuqkAVlyBXKYkNqOQMl2yLV6jUEZ9MuBdzg887GvramtHY/SGl6pMdIIj5oYb0Flf72hdzKY0CsI+PU10aAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b26c5c7f8cb0d0c4d87a77bff863d0dc366c658a4321214f5a3279fd512c8f51","last_reissued_at":"2026-05-17T23:55:10.320135Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:10.320135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Extremely Massive Quasars are not Good Proxies for Dense Environments Compared to Massive Galaxies: Environments of Extremely Massive Quasars and Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Byeong-Gon Park, Hyunsung David Jun, Minhee Hyun, Minjin Kim, Myungshin Im, Narae Hwang, Yongmin Yoon","submitted_at":"2019-01-08T11:51:51Z","abstract_excerpt":"Black hole mass scaling relations suggest that extremely massive black holes (EMBHs) with $M_\\mathrm{BH}\\ge10^{9.4}\\,M_{\\odot}$ are found in the most massive galaxies with $M_\\mathrm{star}\\ge10^{11.6}\\,M_{\\odot}$, which are commonly found in dense environments, like galaxy clusters. 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