The 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe

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dc.creatorVerde, Licia
dc.creatorHeavens, Alan F.
dc.creatorPercival, Will J.
dc.creatorMatarrese, Sabino
dc.creatorBaugh, C. M.
dc.creatorBland-Hawthorn, J.
dc.creatorBridges, T.
dc.creatorCannon, R.
dc.creatorCole, S.
dc.creatorColless, M.
dc.creatorCollins, C.
dc.creatorCouch, W.
dc.creatorDalton, G.
dc.creatorDe Propris, R.
dc.creatorDriver, S. P.
dc.creatorEfstathiou, G.
dc.creatorEllis, R. S.
dc.creatorFrenk, C. S.
dc.creatorGlazebrook, K.
dc.creatorJackson, C.
dc.creatorLahav, O.
dc.creatorLewis, I.
dc.creatorLumsden, S.
dc.creatorMaddox, S.
dc.creatorMadgwick, D. S.
dc.creatorNorberg, P.
dc.creatorPeacock, J. A.
dc.creatorPeterson, B. A.
dc.creatorSutherland, W.
dc.creatorTaylor, K.
dc.date2001-12-06
dc.date2002-05-01
dc.date.accessioned2026-07-07T10:31:10Z
dc.date.available2026-07-07T10:31:10Z
dc.descriptionWe 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 indeed trace the underlying mass distribution. The bias parameter can be combined with the 2dFGRS measurement of the redshift distortion parameter beta = Omega_m^{0.6}/b_1, to yield Omega_m = 0.27 pm 0.06 for the matter density of the Universe, a result which is determined entirely from this survey, independently of other datasets. Our measurement of the matter density of the Universe should be interpreted as Omega_m at the effective redshift of the survey (z=0.17).
dc.description9 pages, 4 figures, MNRAS accepted (minor changes to match the accepted version)
dc.identifierhttps://arxiv.org/abs/astro-ph/0112161
dc.identifierhttp://arxiv.org/abs/astro-ph/0112161
dc.identifierMon.Not.Roy.Astron.Soc.335:432,2002
dc.identifierdoi:10.1046/j.1365-8711.2002.05620.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178319
dc.subjectAstrophysics
dc.titleThe 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe
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