2005A&A...440..791T


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET07:45:42

2005A&A...440..791T - Astronomy and Astrophysics, volume 440, 791-797 (2005/9-4)

The quiescent Hubble flow, local dark energy tests, and pairwise velocity dispersion in a Ω = 1 universe.

TEERIKORPI P., CHERNIN A.D. and BARYSHEV Y.V.

Abstract (from CDS):

We review the increasing evidence for the cosmological relevance of the cold local Hubble flow. New observations, N-body simulations and other theoretical arguments are discussed, supporting our previous suggestion that the cosmological vacuum or uniform dark energy can have locally observable consequencies, especially a lower velocity scatter in DE dominated regions. The apparent contradiction between the slight dependence of the growth factor on ΩΛ and the significant influence of dark energy in realistic N-body calculations is clarified. An interesting new result is that in the standard Λ cosmology, gravitation dominates around a typical matter fluctuation up to about the correlation length r0, and we tentatively link this with the high pairwise velocity dispersion on scales up to several Mpc, as measured from galaxy redshift-space correlations. Locally, the smooth Hubble flow on similar scales is consistent with N-body simulations including ΩΛ≃0.7 and a low density contrast in the Local Volume, which make it generally vacuum-dominated beyond 1-2Mpc from galaxies and groups. We introduce a useful way to view the Hubble flow in terms of ``zero gravity'' spheres around galaxies: e.g., a set of non-intersecting spheres, observed to be expanding, actually participates in accelerating expansion. The observed insensitiveness of the local velocity dispersion to galaxy mass is explained as an effect of the vacuum, too.

Abstract Copyright:

Journal keyword(s): dark matter - cosmological parameters - Local Group

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2998 2
2 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1349 2
3 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1588 0
4 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1404 1
5 NAME Maffei Group GrG 03 49 +68.0           ~ 48 0
6 NAME M 81-82 Group GrG 09 55 +69.1           ~ 646 0
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5980 0
8 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 135 0
9 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 236 0
10 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2277 2
11 NAME Local Group GrG ~ ~           ~ 7181 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-07:45:42

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