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The Local Sheet in astronomy is a nearby extragalactic region of space where the Milky Way, the members of the Local Group and other 
* The mass is given as the logarithm (base unspecified) of the mass in
galaxies
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...
share a similar peculiar velocity. This region lies within a radius of about , thick, and galaxies beyond that distance show markedly different velocities. The Local Group has only a relatively small peculiar velocity of with respect to the Local Sheet. Typical velocity dispersion of galaxies is only in the radial direction. Nearly all nearby bright galaxies belong to the Local Sheet. The Local Sheet is part of the Local Volume
The Local Volume is a collection of more than 500 galaxies located in an area of the observable universe near us, within a spherical region with a radius of 11 megaparsecs from Earth or up to a radial velocity of redshift of z < 0.002 (550 km/s). ...
and is in the Virgo Supercluster (Local Supercluster). The Local Sheet forms a wall of galaxies delineating one boundary of the Local Void.
A significant component of the mean velocity of the galaxies in the Local Sheet appears as the result of the gravitational attraction of the Virgo Cluster of galaxies, resulting in a peculiar motion ~ toward the cluster. A second component is directed away from the center of the Local Void; an expanding region of space spanning an estimated that is only sparsely populated with galaxies. This component has a velocity of . The Local Sheet is inclined 8° from the Local Supercluster (Virgo Supercluster).
The so-called Council of Giants is a ring of twelve large galaxies surrounding the Local Group in the Local Sheet, with a radius of . Ten of these are spirals, while the remaining two are ellipticals. The two ellipticals ( Maffei 1 and Centaurus A) lie on opposite sides of the Local Group.
solar mass
The solar mass () is a standard unit of mass in astronomy, equal to approximately . It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and black holes. It is approximately equal to the mass ...
es.
See also
* Local Void, the Local Sheet defining the wall of galaxies at one end of the void *Supergalactic coordinate system
In the 1950s the astronomer Gérard de Vaucouleurs recognized the existence of a flattened “local supercluster” from the Shapley-Ames Catalog in the environment of the Milky Way. He noticed that when one plots nearby galaxies in 3D, they lie mo ...
, the coordinate system taking the Local Sheet, the Supergalactic Plane, as its X–Y bases
References
{{Portal bar, Stars, Spaceflight, Solar System, Science Galaxy superclusters Large-scale structure of the cosmos