{"paper":{"title":"The 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Alan F. Heavens, B.A. Peterson, C. Collins, C. Jackson, C.M. Baugh, C.S. Frenk, D.S.Madgwick, G. Dalton, G. Efstathiou, I. Lewis, J.A. Peacock, J. Bland-Hawthorn, K. Glazebrook, K. Taylor (the 2dF team), Licia Verde (Rutgers, M. Colless, O. Lahav, P. Norberg, Princeton), R. Cannon, R. De Propris, R.S. Ellis, Sabino Matarrese, S. Cole, S. Lumsden, S. Maddox, S.P. Driver, T. Bridges, W. Couch, Will J. Percival, W. Sutherland","submitted_at":"2001-12-06T21:06:11Z","abstract_excerpt":"We compute the bispectrum of the 2dF Galaxy Redshift Survey (2dFGRS) and use it to measure the bias parameter of the galaxies. This parameter quantifies the strength of clustering of the galaxies relative to the mass in the Universe. By analysing 80 million triangle configurations in the wavenumber range 0.1 < k < 0.5 h/Mpc (i.e. on scales roughly between 5 and 30 Mpc/h) we find that the linear bias parameter is consistent with unity: b_1=1.04 pm 0.11, and the quadratic (nonlinear) bias is consistent with zero: b_2=-0.054 pm 0.08. Thus, at least on large scales, optically-selected galaxies do "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0112161","kind":"arxiv","version":3},"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/astro-ph/0112161/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"}