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Redshift-Space Distortions and the Real-Space Clustering of Different Galaxy Types | | Luigi Guzzo
; Michael A. Strauss
; Karl B. Fisher
; Riccardo Giovanelli
; Martha P. Haynes
; | | Date: |
16 Jun 1997 | | Subject: | astro-ph | | Affiliation: | 1,2), Michael A. Strauss , Karl B. Fisher (3,4), Riccardo Giovanelli and Martha P. Haynes ( Brera Obs., Princeton Univ., IAS Princeton, Univ. of Texas, Cornell Univ. | | Abstract: | We study the distortions induced by peculiar velocities on the redshift-space correlation function of galaxies of different morphological types in the Pisces-Perseus redshift survey. Redshift-space distortions affect early- and late-type galaxies in different ways. In particular, at small separations, the dominant effect comes from virialized cluster cores, where ellipticals are the dominant population. The net result is that a meaningful comparison of the clustering strength of different morphological types can be performed only in real space, i.e., after projecting out the redshift distortions on the two-point correlation function xi(r_p,pi). A power-law fit to the projected function w_p(r_p) on scales smaller than 10/h Mpc gives r_o = 8.35_{-0.76}^{+0.75} /h Mpc, gamma = 2.05_{-0.08}^{+0.10} for the early-type population, and r_o = 5.55_{-0.45}^{+0.40} /h Mpc, gamma = 1.73_{-0.08}^{+0.07} for spirals and irregulars. These values are derived for a sample luminosity brighter than M_{Zw} = -19.5. We detect a 25% increase of r_o with luminosity for all types combined, from M_{Zw} = -19 to -20. In the framework of a simple stable-clustering model for the mean streaming of pairs, we estimate sigma_12(1), the one-dimensional pairwise velocity dispersion between 0 and 1 /h Mpc, to be 865^{+250}_{-165} km/s for early-type galaxies and 345^{+95}_{-65} km/s for late types. This latter value should be a fair estimate of the pairwise dispersion for ``field’’ galaxies; it is stable with respect to the presence or absence of clusters in the sample, and is consistent with the values found for non-cluster galaxies and IRAS galaxies at similar separations. | | Source: | arXiv, astro-ph/9706150 | | Services: | Forum | Review | PDF | Favorites | |
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