Galaxy filament

Galaxy filament
In cosmology, galaxy filaments are the largest known structures in the universe, consisting of 'walls' of gravitationally bound galactic superclusters. These massive, thread-like formations can reach 80 megaparsecs h−1 (or of the order of 160 to 260 million light-years) and form the boundaries between voids. Galaxy filaments form the cosmic web and define the overall structure of the observable universe.
Discovery
Discovery of structures larger than superclusters began in the late-1980s. In 1987, astronomer R. Brent Tully of the University of Hawaii's Institute of Astronomy identified what he called the Pisces–Cetus Supercluster Complex. In 1989, the CfA2 Great Wall was discovered, followed by the Sloan Great Wall in 2003.
In January 2013, researchers led by Roger Clowes of the University of Central Lancashire announced the discovery of a large quasar group, the Huge-LQG, which dwarfs previously discovered galaxy filaments in size. In November 2013, using gamma-ray bursts as reference points, astronomers discovered the Hercules–Corona Borealis Great Wall, an extremely large filament measuring more than 10 billion light-years across.
Filaments
The filament subtype of filaments have roughly similar major and minor axes in cross-section, along the lengthwise axis.
A short filament was proposed by Adi Zitrin and Noah Brosch—detected by identifying an alignment of star-forming galaxies—in the neighborhood of the Milky Way and the Local Group. The proposal of this filament, and of a similar but shorter filament, were the result of a study by McQuinn et al. (2014) based on distance measurements using the TRGB method.
Galaxy walls
The galaxy wall subtype of filaments have a significantly greater major axis than minor axis in cross-section, along the lengthwise axis.
A "Centaurus Great Wall" (or "Fornax Great Wall" or "Virgo Great Wall") has been proposed, which would include the Fornax Wall as a portion of it (visually created by the Zone of Avoidance) along with the Centaurus Supercluster and the Virgo Supercluster also known as the Local Supercluster within which the Milky Way galaxy is located (implying this to be the Local Great Wall).
A wall was proposed to be the physical embodiment of the Great Attractor, with the Norma Cluster as part of it. It is sometimes referred to as the Great Attractor Wall or Norma Wall. This suggestion was superseded by the proposal of a supercluster, Laniakea, that would encompass the Great Attractor, Virgo Supercluster, Hydra-Centaurus Superclusters.
A wall was proposed in 2000 to lie at z=1.47 in the vicinity of radio galaxy B3 0003+387.
A wall was proposed in 2000 to lie at z=0.559 in the northern Hubble Deep Field (HDF North).
Map of nearest galaxy walls
Large Quasar Groups
Large quasar groups (LQGs) are some of the largest structures known. They are theorized to be protohyperclusters/proto-supercluster-complexes/galaxy filament precursors.
Supercluster complex
Maps of large-scale distribution
See also
List of largest cosmic structures
Galaxy
Galaxy cluster
Galaxy supercluster
Illustris project
Large-scale structure
List of galaxies
List of galaxy groups and clusters
Void (astronomy)
References
Further reading
Kevin A. Pimbblet arXiv, 14 March 2005.
External links
Pictures of the filamentary network
The Universe Within One Billion Light Years with List of Nearby Superclusters (from the Atlas of the Universe):
Large-scale structure of the cosmos