Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368l..17e&link_type=abstract
Astronomy and Astrophysics, v.368, p.L17-L20 (2001)
Astronomy and Astrophysics
Astrophysics
39
Cosmology: Observations, Galaxies: Distances And Redshifts, Galaxies: General, Galaxies: Kinematics And Dynamics, Local Group
Scientific paper
Cepheid distances of local galaxies (<7 Mpc) are used to study the very nearby velocity field, as pioneered by Sandage (\cite{Sandage86}) who also pointed out its remarkable properties: linearity and quietness. The new data show that the velocity dispersion in the distance range as seen from the barycentre of the Local Group 1-8 Mpc is as low as 38 km s-1. The local rate of expansion coincides with the global Hubble constant. Down to 1.5 Mpc we cannot detect a deviation from the linear Hubble flow. This puts an upper limit for the mass of the Local Group, for a wide class of Friedman models, including those with the cosmological constant.
Baryshev Yu.
Ekholm Timo
Hanski M. O.
Paturel Georges
Teerikorpi Pekka
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