1999/06/23 by Riccardo Giovanelli, R. Giovanelli, Daniel A. Dale +6 · 3 citations
Physics and Astronomy · #Amplitude #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Flow (mathematics) #Galaxies: Formation, Evolution, Phenomena #Hubble Ultra-Deep Field #Hubble volume #Hubble's law #Local Void #Peculiar velocity #Universe #astro-ph
paper · pdf · doi:10.1086/307906
11 pages, 1 tables, 1 figure; uses AAS LaTex; to appear in ApJ Nov 99
arxiv created 1999/06/23 · openalex publication_date 1999/11/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Zehavi et al. have suggested that the Hubble flow within 70 h -1 Mpc may be accelerated by the existence of a void centered on the Local Group. Its underdensity would be ~20%, which would result in a local Hubble distortion of about 6.5%. We have combined the peculiar velocity data of two samples of clusters of galaxies, SCI and SCII, to investigate the amplitude of Hubble distortions to 200 h -1 Mpc. Our results are not supportive of that conclusion. The amplitude of a possible distortion in the Hubble flow within 70 h -1 Mpc in the SCI+SCII merged data is 0.010 ± 0.022. The largest, and still quite marginal, geocentric deviation from smooth Hubble flow consistent with that data set is a shell with Δ H 0 / H 0 = 0.027 ± 0.023, centered at hd = 101 Mpc and extending over some 30 h -1 Mpc. Our results are thus consistent with a Hubble flow that, on distances in excess of ~50 h -1 Mpc, is remarkably smooth.