No Hubble Bubble in the Local Universe
Abstract
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 ΔH0/H0=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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1999
- DOI:
- 10.1086/307906
- arXiv:
- arXiv:astro-ph/9906362
- Bibcode:
- 1999ApJ...525...25G
- Keywords:
-
- COSMOLOGY: OBSERVATIONS;
- GALAXIES: DISTANCES AND REDSHIFTS;
- COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE;
- Cosmology: Observations;
- Galaxies: Distances and Redshifts;
- Cosmology: Large-Scale Structure of Universe;
- Astrophysics
- E-Print:
- 11 pages, 1 tables, 1 figure