On the quiescence of the Hubble flow in the vicinity of the Local Group

Details On the quiescence of the Hubble flow in the vicinity of the Local Group On the quiescence of the Hubble flow in the vicinity of the Local Group

2001-03-06

arxiv.org/abs/astro-ph/0103090v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Accepted to Astron. Astrophys. Letters

Scientific paper

Cepheid distances of local galaxies (<7 Mpc) are used to study the very nearby velocity field, as pioneered by Sandage (Sandage 1986) 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/sec. 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.

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