This is a list of voids in astronomy. Voids are particularly galaxy-poor regions of space between filaments, making up the

large-scale structure of the universe The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because the electromagnetic radiation from these obj ...

. Some voids are known as ''supervoids''. In the tables, ''z'' is the cosmological

redshift In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and simultaneous increase in f ...

, ''c'' the

speed of light The speed of light in vacuum, commonly denoted , is a universal physical constant that is important in many areas of physics. The speed of light is exactly equal to ). According to the special theory of relativity, is the upper limit ...

, and ''h'' the dimensionless

Hubble parameter Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving a ...

, which has a value of approximately 0.7 (the Hubble constant ''H''₀ = ''h'' × 100 km s⁻¹ Mpc⁻¹). Mpc stands for

megaparsec The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, and ...

. The co-ordinates (right ascension and declination) and distance given refer to the approximate center of the region.

Voids and supervoids

Largest voids

Named voids

SIMBAD
"list of objects in '*void' wildcard search"
(accessed 15 September 2009)SIMBAD
"list of objects of type 'vid'"
(accessed 15 September 2009)

Voids designated by their constellation

Other voids

Voids by search or survey

Tully list

In 1985, Tully determined a local dominant supercluster plane, and found the

Pisces–Cetus Supercluster Complex The Pisces–Cetus Supercluster Complex is a galaxy filament. It includes the Laniakea Supercluster which contains the Virgo Supercluster lobe which in turn contains the Local Group, the galaxy cluster that includes the Milky Way. This filament ...

B&B Abell-derived list

In a 1985 study of Abell clusters, 29 voids were determined, in the sphere z<0.1 around Earth.

SSRS1 list

A redshift survey of galaxies in the southern sky in 1988, out to a distance of 120 Mpc/''h'', revealed some voids.

SSRS2 list

In 1994, a redshift survey in the southern sky identified 18 voids, 11 of which are major voids.

1994 EEDTA Whole Sky Survey

A 1994 census lists a total of 27 supervoids within a cube of 740 Mpc a side, centered on us (z=0.1 distant sphere).

Galactic Anti-Center IRAS search

In a 1995 study of IRAS data looking for large-scale structure in the Galactic Anticenter in the

Zone of Avoidance The Zone of Avoidance (ZOA, ZoA), or Zone of Galactic Obscuration (ZGO), is the area of the sky that is obscured by the Milky Way. The Zone of Avoidance was originally called the Zone of Few Nebulae in an 1878 paper by English astronomer Richard ...

, four voids were discovered.

IRAS list

Analysis of the IRAS redshift survey in 1997 revealed 24 voids, 12 of which were termed "significant"

Notes

References

{{Expand list, date=February 2011 *

Voids Void may refer to: Science, engineering, and technology * Void (astronomy), the spaces between galaxy filaments that contain no galaxies * Void (composites), a pore that remains unoccupied in a composite material * Void, synonym for vacuum, a s ...