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Virgo Supercluster

Topic: Astronomy

 From HandWiki - Reading time: 6 min
Short description: Galactic supercluster containing the Virgo Cluster


Virgo Supercluster
Local supercluster-ly.jpg
Distances from the Local Group for selected groups and clusters within the Local Supercluster
Observation data (Epoch J2000)
RedshiftDoppler shift
Binding mass~1.48 × 1015[1] M☉
Other designations
Local Supercluster, LSC, LS
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) is a mass concentration of galaxies containing the Virgo Cluster and Local Group, which itself contains the Milky Way and Andromeda galaxies, as well as others. At least 100 galaxy groups and clusters are located within its diameter of 33 megaparsecs (110 million light-years). The Virgo SC is one of about 10 million superclusters in the observable universe and is in the Pisces–Cetus Supercluster Complex, a galaxy filament.

A 2014 study indicates that the Virgo Supercluster is only a lobe of an even greater supercluster, Laniakea, a larger, competing referent of the term Local Supercluster centered on the Great Attractor.[2]

Background

Beginning with the first large sample of nebulae published by William and John Herschel in 1863, it was known that there is a marked excess of nebular fields in the constellation Virgo, near the north galactic pole. In the 1950s, French–American astronomer Gérard de Vaucouleurs was the first to argue that this excess represented a large-scale galaxy-like structure, coining the term "Local Supergalaxy" in 1953, which he changed to "Local Supercluster" (LSC[3]) in 1958. Harlow Shapley, in his 1959 book Of Stars and Men, suggested the term Metagalaxy.[4]

Debate went on during the 1960s and 1970s as to whether the Local Supercluster (LS) was actually a structure or a chance alignment of galaxies.[5] The issue was resolved with the large redshift surveys of the late 1970s and early 1980s, which convincingly showed the flattened concentration of galaxies along the supergalactic plane.[6]

Structure

In a comprehensive 1982 paper, R. Brent Tully presented the conclusions of his research concerning the basic structure of the LS. It consists of two components: an appreciably flattened disk containing two-thirds of the supercluster's luminous galaxies, and a roughly spherical halo containing the remaining one-third.[7] The disk itself is a thin (~1 Mpc) ellipsoid with a long axis / short axis ratio of at least 6 to 1, and possibly as high as 9 to 1.[8] Data released in June 2003 from the 5-year Two-degree-Field Galaxy Redshift Survey (2dF) has allowed astronomers to compare the LS to other superclusters. The LS represents a typical poor (that is, lacking a high density core) supercluster of rather small size. It has one rich galaxy cluster in the center, surrounded by filaments of galaxies and poor groups.[1]

The Local Group is located on the outskirts of the LS in a small filament extending from the Fornax Cluster to the Virgo Cluster.[6] The Virgo Supercluster's volume is very approximately 7,000 times that of the Local Group, or 100 billion times that of the Milky Way.

Galaxy distribution

The number density of galaxies in the LS falls off with the square of the distance from its center near the Virgo Cluster, suggesting that this cluster is not randomly located. Overall, the vast majority of the luminous galaxies (less than absolute magnitude −13) are concentrated in a small number of clouds (groups of galaxy clusters). Ninety-eight percent can be found in the following 11 clouds, given in decreasing order of number of luminous galaxies: Canes Venatici, Virgo Cluster, Virgo II (southern extension), Leo II, Virgo III, Crater (NGC 3672), Leo I, Leo Minor (NGC 2841), Draco (NGC 5907), Antlia (NGC 2997), and NGC 5643.

Of the luminous galaxies located in the disk, one third are in the Virgo Cluster. The remainder are found in the Canes Venatici Cloud and Virgo II Cloud, plus the somewhat insignificant NGC 5643 Group.

The luminous galaxies in the halo are concentrated in a small number of clouds (94% in 7 clouds). This distribution indicates that "most of the volume of the supergalactic plane is a great void."[8] A helpful analogy that matches the observed distribution is that of soap bubbles. Flattish clusters and superclusters are found at the intersection of bubbles, which are large, roughly spherical (on the order of 20–60 Mpc in diameter) voids in space.[9] Long filamentary structures seem to predominate. An example of this is the Hydra–Centaurus Supercluster, the nearest supercluster to the LS, which starts at a distance of roughly 30 Mpc and extends to 60 Mpc.[10]

Cosmology

Large-scale dynamics

Since the late 1980s it has been apparent that not only the Local Group, but all matter out to a distance of at least 50 Mpc is experiencing a bulk flow on the order of 600 km/s in the direction of the Norma Cluster (Abell 3627).[11] Lynden-Bell et al. (1988) dubbed the cause of this the "Great Attractor". The Great Attractor is now understood to be the center of mass of an even larger structure of galaxy clusters, dubbed "Laniakea", which includes the Virgo Supercluster (including the Local Group) as well as the Hydra-Centaurus Supercluster, the Pavo-Indus Supercluster, and the Fornax Group.

The Great Attractor, together with the entire supercluster, is found to be moving toward Shapley Supercluster, with center of Shapley Attractor.[12]

Dark matter

The LS has a total mass M ≈ 1015 M☉ and a total optical luminosity L ≈ 3×1012 L☉.[1] This yields a mass-to-light ratio of about 300 times that of the solar ratio (M☉/L☉ = 1), a figure that is consistent with results obtained for other superclusters.[13][14] By comparison, the mass-to-light ratio for the Milky Way is 63.8 assuming a solar absolute magnitude of 4.83,[15] a Milky Way absolute magnitude of −20.9,[16] and a Milky Way mass of 1.25×1012 M☉.[17] These ratios are one of the main arguments in favor of the presence of large amounts of dark matter in the universe; if dark matter did not exist, much smaller mass-to-light ratios would be expected.

Maps

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Diagrams

A diagram of our location in the observable universe. (Alternative image.)

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Einasto, M. (December 2007). "The richest superclusters. I. Morphology". Astronomy and Astrophysics 476 (2): 697–711. doi:10.1051/0004-6361:20078037. Bibcode: 2007A&A...476..697E. 
  2. ↑ R. Brent Tully; Hélène Courtois; Yehuda Hoffman; Daniel Pomarède (2 September 2014). "The Laniakea supercluster of galaxies". Nature 513 (7516): 71–73. 4 September 2014. doi:10.1038/nature13674. PMID 25186900. Bibcode: 2014Natur.513...71T. 
  3. ↑ cfa.harvard.edu, The Geometry of the Local Supercluster, John P. Huchra, 2007 (accessed 12-12-2008)
  4. ↑ Shapley, Harlow Of Stars and Men (1959)
  5. ↑ de Vaucouleurs, G. (March 1981). "The Local Supercluster of Galaxies". Bulletin of the Astronomical Society of India 9: 6 (see note). Bibcode: 1981BASI....9....1D. 
  6. ↑ 6.0 6.1 Klypin, Anatoly (October 2003). "Constrained Simulations of the Real Universe: The Local Supercluster". The Astrophysical Journal 596 (1): 19–33. doi:10.1086/377574. Bibcode: 2003ApJ...596...19K. 
  7. ↑ Hu, F. X. (April 2006). "Orientation of Galaxies in the Local Supercluster: A Review". Astrophysics and Space Science 302 (1–4): 43–59. doi:10.1007/s10509-005-9006-7. Bibcode: 2006Ap&SS.302...43H. 
  8. ↑ 8.0 8.1 Tully, R. B. (15 Jun 1982). "The Local Supercluster". Astrophysical Journal 257 (1): 389–422. doi:10.1086/159999. Bibcode: 1982ApJ...257..389T. 
  9. ↑ Carroll, Bradley; Ostlie, Dale (1996). An Introduction to Modern Astrophysics. New York: Addison-Wesley. p. 1136. ISBN 0-201-54730-9. 
  10. ↑ Fairall, A. P.; Vettolani, G.; Chincarini, G. (May 1989). "A wide angle redshift survey of the Hydra-Centaurus region". Astronomy and Astrophysics Supplement Series 78 (2): 270. ISSN 0365-0138. Bibcode: 1989A&AS...78..269F. 
  11. ↑ Plionis, Manolis; Valdarnini, Riccardo (March 1991). "Evidence for large-scale structure on scales about 300/h MPC". Monthly Notices of the Royal Astronomical Society 249: 46–61. doi:10.1093/mnras/249.1.46. Bibcode: 1991MNRAS.249...46P. 
  12. ↑ "What is the Great Attractor?". 14 July 2014. http://www.universetoday.com/113150/what-is-the-great-attractor/. 
  13. ↑ Small, Todd A. (Jan 1998). "The Norris Survey of the Corona Borealis Supercluster. III. Structure and Mass of the Supercluster". Astrophysical Journal 492 (1): 45–56. doi:10.1086/305037. Bibcode: 1998ApJ...492...45S. 
  14. ↑ Heymans, Catherine (April 2008). "The dark matter environment of the A901 abell A901/902 supercluster: a weak lensing analysis of the HST STAGES survey". Monthly Notices of the Royal Astronomical Society 385 (3): 1431–1442. doi:10.1111/j.1365-2966.2008.12919.x. Bibcode: 2008MNRAS.385.1431H. 
  15. ↑ Williams, D. R. (2004). "Sun Fact Sheet". NASA. http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html. 
  16. ↑ Jerry Coffey. "Absolute Magnitude". http://www.universetoday.com/guide-to-space/the-universe/absolute-magnitude/. 
  17. ↑ McMillan, Paul J. (July 2011), "Mass models of the Milky Way", Monthly Notices of the Royal Astronomical Society 414 (3): 2446–2457, doi:10.1111/j.1365-2966.2011.18564.x, Bibcode: 2011MNRAS.414.2446M 

Further reading

External links

  • The Atlas of the Universe, a website created by astrophysicist Richard Powell that shows maps of our local universe on a number of different scales (similar to above maps).



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