Mére et Fils

Giovanelli, Felix; Silvestre, Charles

doi:10.2307/40083811

Cited by 1 publication

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“…The scatter of the mock samples was adjusted so that the radial variation of the peculiar velocities at large distances in the mock catalog match the observations. The derived scatter of < ∼ 0.4 mag depends on the HI line-width, and is in any case smaller than that obtained for galaxies in clusters (Giovanelli et al 1996a). A more extensive discussion of the motivation and the -7details for the adopted procedure will be presented in da Costa et al (1996).…”

Section: Analysis Of the Sfi Samplementioning

confidence: 88%

The Mass Distribution in the Nearby Universe

Costa

Freudling

Wegner

et al. 1996

The Astrophysical Journal

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We present a new reconstruction of the mass density and the peculiar velocity fields in the nearby universe using recent measurements of Tully-Fisher distances for a sample of late spirals. We find significant differences between our reconstructed fields and those obtained in earlier work: overdensities tend to be more compact while underdense regions, consisting of individual voids, are more abundant. Our results suggest that voids observed in redshift surveys of galaxies represent real voids in the underlying matter distribution. While we detect a bulk velocity of $\sim$ 300 \kms, within a top-hat window 6000 \kms in radius, the flow is less coherent than previously claimed, exhibiting a bifurcation towards the Perseus-Pisces and the Great Attractor complexes. This is the first time that this feature is seen from peculiar velocity measurements. The observed velocity field resembles, more closely than any previous reconstruction, the velocity field predicted from self-consistent reconstructions based on all-sky redshift surveys. This better match is likely to affect estimates of the parameter $\beta = \Omega^{0.6}/b$ and its uncertainty based on velocity-velocity comparisons.Comment: accepted for publication in ApJ Letter

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Section: Analysis Of the Sfi Samplementioning

confidence: 88%