Mapping the Local Supercluster

Details Mapping the Local Supercluster Mapping the Local Supercluster

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..577s&link_type=abstract

Nature, vol. 299, Oct. 14, 1982, p. 577, 578.

Astronomy and Astrophysics

Astronomy

Astronomical Maps, Disk Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Hubble Constant, Mapping, Milky Way Galaxy, Red Shift, Virgo Galactic Cluster

Scientific paper

Observations of the Local Supercluster are examined for evidence of processes of galaxy formation and compared with theories for closed and open universes. Redshift measurements of the Galaxy have revealed that the Local Supercluster contains 60% of its galaxies in a thin disk, with the remainder in an inhomogeneous halo. The disk is 2 Mpc thick and 12 Mpc in diameter. The thinness of the disk can be verified only if random motions of the galaxies normal to the disk are less than 100 km/sec, or if invisible matter is present in large enough quantity to dominate the interior gravitational attraction. Velocity field analysis from the same redshift data has indicated a deceleration of 250 km/sec, with a rotational velocity of within 60 km/sec of 180 km/sec. The slowdown supports pancake theories of coherent formation of large scale structure from density fluctuations at an earlier epoch.

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