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The Virgo Supercluster

The Virgo Supercluster or Local Supercluster is the galactic supercluster that contains the Local Group, the latter containing, in its turn, the Milky Way and Andromeda galaxies.

Contents

Disk and halo

The Supercluster consists of two components: disk component and halo component. The flattened disk component has a pancake-like shape, and contains 60% of the Virgo Supercluster's luminous galaxies. The halo component consists of many elongated objects, and contains the remaining 40% of the Virgo Supercluster's luminous galaxies.

Diameter

The diameter of the Supercluster is about 200 million light years; it contains about 100 groups and clusters of galaxies and is dominated by the Virgo cluster near its center. Our Local Group is located near the edge and is being drawn inward toward the Virgo cluster[1]. It is still unclear if at some time in the far future, the Local Group and other galactic clusters will be "eaten" by the very massive Virgo A Galaxy[2].

Mass

By tracking its gravitational effect on the movement of galaxies, one can estimate that the total mass of the Virgo Supercluster is about 1015 solar masses (2 × 1046 kg; see Orders of magnitude (mass)). As its luminosity is far too small for this number of stars, it is thought that a large part of its mass is dark matter.

The entire Virgo Supercluster is being pulled toward a gravitational anomaly known as the Great Attractor, which lies near the Norma cluster.

Divisions

The Virgo Supercluster is subdivided into groups of clusters called galaxy clouds. Three clouds are on the disk component: Virgo cluster, Canes Venatici Cloud and Virgo II Cloud. The halo consists of many elongated clouds pointing toward the Virgo Cluster.

Component clusters and groups

Clickable maps

Virgo cluster.html Centaurus_A/M83_Group.html M81 group.html Maffei_Group.html NGC 1023 Group.html M101 group.html NGC 2997 Group.html Canes Venatici I Group.html NGC 5033 group.html Ursa_Major_Cluster.html Leo I Group.html NGC 6744 Group.html Dorado Group.html Virgo III Groups.html NGC 4697.html Leo II Groups.html NGC 7582.html Fornax cluster.html Eridanus Cluster.html Local Group.html Sculptor group.html
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The Virgo Supercluster in supergalactic coordinates (clickable map)
NGC 55.html Milky Way.html Large Magellanic Cloud.html NGC 3109.html Messier 31.html Messier 33.html NGC 247.html Circinus Galaxy.html NGC 5128.html NGC 5253.html NGC 5102.html NGC 5128 Group.html IC4662.html Messier 83.html Virgo Cluster.html ESO 274-01.html NGC 1313.html NGC 625.html NGC 7793.html NGC 4945.html NGC 45.html NGC 253.html Sculptor Group.html Local Group.html NGC 1569.html NGC 300.html IC 342.html Maffei Group.html NGC 404.html NGC 784.html Maffei I.html Maffei II.html Dwingeloo 1.html NGC 1560.html Messier 81.html IC 2574.html Messier 82.html NGC 3077.html NGC 2976.html NGC 4605.html NGC 6503.html NGC 5204.html NGC 3738.html NGC 4236.html NGC 2366.html NGC 2403.html NGC4305.html NGC5023.html Messier 94.html NGC 4244.html NGC 4214.html NGC 4449.html NGC 4395.html Canes I Group.html M81 Group.html
About this image
The nearest galaxy groups projected onto the supergalactic plane (clickable map)

See also

References

  1. ^ This is due to the so-called Virgo-centric flow towards the center of the supercluster. For details, see [1]
  2. ^ See The Virgo Cluster and the Local Group of Galaxies at [2]
  • Brent Tully: The Local Supercluster, Astrophys. J., vol. 257, pp. 389-422 (1982)
  • Oscar Monchito: Superclusters and Other Stuff, Colton, vol. 12, pp. 124-118 (1992)

Further reading

External links

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