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23 April 2024 |
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A Comparison of The PSCz and Stromlo-APM Redshift Surveys | | M.D. Seaborne
; 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 May 1999 | | Subject: | astro-ph | | Affiliation: | Oxford), W. Sutherland(Oxford), H. Tadros(Oxford), G. Efstathiou(IoA), C.S. Frenk(Durham), O. Keeble(Imperial), S. Maddox(IoA), R.G. McMahon(IoA), S. Oliver(Imperial), M. Rowan-Robinson(Imperial), W. Saunders(Edinburgh), S.D.M. White(MPA | | Abstract: | We present a direct comparison of the clustering properties of two redshift surveys covering a common volume of space: the recently completed IRAS Point Source Catalogue redshift survey (PSCz) containing 14500 galaxies with a limiting flux of 0.6 Jy at 60 microns, and the optical Stromlo-APM survey containing 1787 galaxies in a region of 4300 deg^2 in the southern Galactic cap. We use three methods to compare the clustering properties: the counts-in-cells comparison of Efstathiou (1995), the two-point cross correlation function, and the Tegmark (1998) `null-buster’ test. We find that the Stromlo variances are systematically higher than those of PSCz, as expected due to the deficit of early-type galaxies in IRAS samples. However we find that the differences between the cell counts are consistent with a linear bias between the two surveys, with a relative bias parameter b_rel = b_Stromlo/b_PSCz approx 1.3 which appears approximately scale-independent. The correlation coefficient R between optical and IRAS densities on scales sim 20 Mpc/h is R > 0.72 at 95% c.l., placing limits on types of `stochastic bias’ which affect optical and IRAS galaxies differently. | | Source: | arXiv, astro-ph/9905182 | | Services: | Forum | Review | PDF | Favorites | |
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