SIMBAD references

2018A&A...609A..11K - Astronomy and Astrophysics, volume 609A, 11-11 (2018/1-1)

Cosmic flow around local massive galaxies.

KASHIBADZE O.G. and KARACHENTSEV I.D.

Abstract (from CDS):

Aims. We use accurate data on distances and radial velocities of galaxies around the Local Group, as well as around 14 other massive nearby groups, to estimate their radius of the zero-velocity surface, R0, which separates any group against the global cosmic expansion.
Methods. Our R0 estimate was based on fitting the data to the velocity field expected from the spherical infall model, including effects of the cosmological constant. The reported uncertainties were derived by a Monte Carlo simulation.
Results. Testing various assumptions about a location of the group barycentre, we found the optimal estimates of the radius to be 0.91±0.05Mpc for the Local Group, and 0.93±0.02Mpc for a synthetic group stacked from 14 other groups in the Local Volume. Under the standard Planck model parameters, these quantities correspond to the total mass of the group ~(1.6±0.2)x1012M. Thus, we are faced with the paradoxical result that the total mass estimate on the scale of R0~=(3-4)Rvir is only 60% of the virial mass estimate. Anyway, we conclude that wide outskirts of the nearby groups do not contain a large amount of hidden mass outside their virial radius.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: groups: general - galaxies: groups: individual: Local Group

Simbad objects: 229

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2018A&A...609A..11K and select 'bookmark this link' or equivalent in the popup menu


2019.10.16-22:53:27

© Université de Strasbourg/CNRS

    • Contact