Local Sheet

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Local Sheet
Observation data (Epoch )
Brightest memberLocal Group
Major axis17 Mly (5 Mpc) [1]
Minor axis1.5 Mly (0.5 Mpc) [1]
Redshift0.00
Distance0 Mly (0 Mpc)
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

The Local Sheet in

galaxies share a similar peculiar velocity.[2] This region lies within a radius of about 7 Mpc (23 Mly),[3] 0.46 Mpc (1.5 Mly) thick,[1] and galaxies beyond that distance show markedly different velocities.[3] The Local Group has only a relatively small peculiar velocity of 66 km⋅s−1 with respect to the Local Sheet. Typical velocity dispersion of galaxies is only 40 km⋅s−1 in the radial direction.[2] Nearly all nearby bright galaxies belong to the Local Sheet.[1] The Local Sheet is part of the Local Volume and is in the Virgo Supercluster (Local Supercluster).[4] The Local Sheet forms a wall of galaxies delineating one boundary of the Local Void.[5]

A significant component of the mean velocity of the galaxies in the Local Sheet appears as the result of the

Local Supercluster (Virgo Supercluster).[4]

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 3.75 Mpc (12.2 Mly).[4] 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.

Local Sheet (top view)
Galaxies in the "Council of Giants"[4]
Catalog ID Name Constellation Distance (Mly) Stellar mass *
NGC 253 Sculptor Galaxy Sculptor 11 10.805
PGC 9892 Maffei 1 Cassiopeia 11 10.928
PGC 10217 Maffei 2 Cassiopeia 11 10.493
IC 342   Camelopardalis 11 10.302
NGC 3031 M 81 Ursa Major 12 10.905
NGC 3034 M 82 Ursa Major 11 10.573
NGC 4736 M 94 Canes Venatici 15 10.458
NGC 4826
M 64
 Coma Berenices 16 10.496
NGC 5236 M 83 Hydra 16 10.642
NGC 5128 Centaurus A Centaurus 11 11.169
NGC 4945   Centaurus 12 10.528
ESO 97-G13 Circinus Galaxy Circinus 14 10.559

* The mass is given as the logarithm (base unspecified) of the mass in solar masses.

See also

References

  1. ^
    Science Daily
    . 11 March 2014.
  2. ^
    S2CID 14738309
    .
  3. ^
    S2CID 119643726
  4. ^
    doi:10.1093/mnras/stu199
    .
  5. doi:10.1093/mnras/stt1714. {{cite journal}}: Unknown parameter |agency= ignored (help
    )
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