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19 April 2024 |
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The Power Spectrum of the PSC Redshift Survey | | W. Sutherland
; H. Tadros
; G. Efstathiou
; C.S. Frenk
; O. Keeble
; S. Maddox
; R.G. McMahon
; S. Oliver
; M. Rowan-Robinson
; W. Saunders
; S.D.M. White
; | | Date: |
14 Dec 1998 | | Subject: | astro-ph | | Abstract: | We measure the redshift-space power spectrum P(k) for the recently completed IRAS Point Source Catalogue (PSC) redshift survey, which contains 14500 galaxies over 84% of the sky with 60 micron flux >= 0.6 Jansky. Comparison with simulations shows that our estimated errors on P(k) are realistic, and that systematic errors due to the finite survey volume are small for wavenumbers k >~ 0.03 h Mpc^-1. At large scales our power spectrum is intermediate between those of the earlier QDOT and 1.2 Jansky surveys, but with considerably smaller error bars; it falls slightly more steeply to smaller scales. We have fitted families of CDM-like models using the Peacock-Dodds formula for non-linear evolution; the results are somewhat sensitive to the assumed small-scale velocity dispersion sigma_V. Assuming a realistic sigma_V approx 300 km/s yields a shape parameter Gamma ~ 0.25 and normalisation b sigma_8 ~ 0.75; if sigma_V is as high as 600 km/s then Gamma = 0.5 is only marginally excluded. There is little evidence for any `preferred scale’ in the power spectrum or non-Gaussian behaviour in the distribution of large-scale power. | | Source: | arXiv, astro-ph/9901189 | | Services: | Forum | Review | PDF | Favorites | |
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