Local anisotropy of the Hubble flow within 6 Mpc.

Details Local anisotropy of the Hubble flow within 6 Mpc. Local anisotropy of the Hubble flow within 6 Mpc.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apl%26c..36....7k&link_type=abstract

Astrophysical Letters and Communications, Vol. 36, Nos. 1 - 6, p. 7 - 16

Astronomy and Astrophysics

Astrophysics

Hubble Expansion: Anisotropy, Galaxy Clustering: Peculiar Velocities

Scientific paper

The authors consider a sample of 103 galaxies with radial velocities V0 < 500 km s-1 and distances obtained by means of photometric distance indicators. Ranking the galaxies with their distance R, they determine a running apex for the Sun, the Galax, and the Local Group as a function of R and the Hubble parameter. When both the Hubble component and the apex velocity are removed, the residual velocity field shows clear signs of anisotropy. Within the Local Supergalactic plane there is a prevalence of negative peculiar velocities towards the "+SGY" direction. This featue has perhaps the same origin as the "Local Velocity Anomaly" (LVA). Besides the LVA, an excess of negative peculiar velocities is seen also along the SGZ axis and can be interpreted as if the expansion of the local pancake proceeds about 30% slower in the direction perpendicular to the symmetry plane than in the plane itself.

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