Open AccessThe 2dF Galaxy Redshift Survey: the power spectrum and the matter content of the Universe
Author(s) -
Percival Will J.,
Baugh Carlton M.,
BlandHawthorn Joss,
Bridges Terry,
Can Russell,
Cole Shaun,
Colless Matthew,
Collins Chris,
Couch Warrick,
Dalton Gavin,
De Propris Roberto,
Driver Simon P.,
Efstathiou George,
Ellis Richard S.,
Frenk Carlos S.,
Glazebrook Karl,
Jackson Carole,
Lahav Ofer,
Lewis Ian,
Lumsden Stuart,
Maddox Steve,
Moody Stephen,
Norberg Peder,
Peacock John A.,
Peterson Bruce A.,
Sutherland Will,
Taylor Keith
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04827.x
Subject(s) - physics , redshift survey , galaxy , spectral density , redshift , astrophysics , baryon , window function , baryon acoustic oscillations , universe , matter power spectrum , astronomy , observational cosmology , statistics , mathematics
The 2dF Galaxy Redshift Survey has now measured in excess of 160 000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct Fourier transform based technique. We argue that, within the k ‐space region , the shape of this spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analysed in detail. By convolving model spectra, we are able to fit the power‐spectrum data and provide a measure of the matter content of the Universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68 per cent confidence limits on the total matter density times the Hubble parameter , and the baryon fraction , assuming scale‐invariant primordial fluctuations.