Data di Pubblicazione:
2001
Citazione:
Power spectrum analysis of the ESO slice project galaxy redshift survey / E. Carretti, C. Bertoni, A. Messina, E. Zucca, L. Guzzo. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 324:4(2001), pp. 1029-1040.
Abstract:
We measure the power spectrum of the galaxy distribution in the ESO Slice Project (ESP) galaxy redshift survey. We develop a technique to describe the survey window function analytically, and then deconvolve it from the measured power spectrum using a variant of the Lucy method. We test the whole deconvolution procedure on ESP mock catalogues drawn from large N-body simulations, and find that it is reliable for recovering the correct amplitude and shape of P(k) at k > 0.065 h Mpc(-1). In general, the technique is applicable to any survey composed of a collection of circular fields with an arbitrary pattern on the sky, as typical of surveys based on fibre spectrographs. The estimated power spectrum has a well-defined power-law shape k(n) with n similar or equal to -2.2 for k greater than or equal to 0.2 h Mpc(-1), and a smooth bend to a flatter shape (n similar or equal to -1.6) for smaller k. The smallest wavenumber where a meaningful reconstruction can be performed (k similar to 0.06 h Mpc(-1)) does not allow us to explore the range of scales where other power spectra seem to show a flattening and hint at a turnover. We also find, by a direct comparison of the Fourier transforms, that the estimate of the two-point correlation function xi (s) is much less sensitive to the effect of a problematic window function, such as that of the ESP, than the power spectrum. Comparison with other surveys shows an excellent agreement with estimates from blue-selected surveys. In particular, the ESP power spectrum is virtually indistinguishable from that of the Durham-UKST survey over the common range of k, an indirect confirmation of the quality of the deconvolution technique applied.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
surveys; galaxies : distances and redshifts; large-scale structure of Universe
Elenco autori:
E. Carretti, C. Bertoni, A. Messina, E. Zucca, L. Guzzo
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