Southern Supercluster Strand

The Southern Supercluster Strand is a galaxy filament that incompasses the Southern Supercluster and the Telescopium−Grus Cloud.

In 2014, it was announced that the Southern Supercluster Strand is a lobe in a greater supercluster, Laniakea, that is centered on the Great Attractor. This would mean that the Southern Supercluster Strand's components, the Telescopium−Grus Cloud and the Southern Supercluster would be part of this new supercluster. The Virgo Supercluster would also be part of this greater supercluster, thus becoming the local supercluster.

Physical characteristics

The Southern Supercluster Strand is a galaxy filament that emerges from the Centaurus Cluster. The filament then branches off into two forks, SSCa, and SSCb, also known as the Southern Supercluster and the Telescopium−Grus Cloud respectively. The Southern Supercluster is a long major chain of galaxies, consisting of the major Dorado, Fornax, and Eridanus clusters while the Telescopium−Grus Cloud is a low density galaxy filament, with no central concentration of galaxies. The Telescopium−Grus Cloud along with the Pavo-Indus Supercluster form parts of a wall bounding the Local Void. Likewise, both structures along with the Southern Supercluster also form a wall bounding the Sculptor Void. The Southern Supercluster Srand extends all the way to the Perseus–Pisces Supercluster. The Southern Supercluster Strand, along with the Centaurus–Puppis–PP filament, which contains the Antila Wall and both extend to the Perseus–Pisces Supercluster, form a wall bounding the Sculptor Void.

Cetus-Aries Cloud

The Cetus-Aries Cloud, is a minor filament that was identified and described in 1987 by astronomer Brent Tully with colleague Richard Fisher in his book ''The Nearby Galaxies Atlas,'' and connects the Southern Supercluster with the Telescopium−Grus Cloud.

List of Groups

Below is a list of groups in the Cetus-Aries Cloud according to astronomer Brent Tully.

: Column 1: The name of the group in Tully's NBGC
: Column 2: The right ascension for epoch 2000.
: Column 3: The declination for epoch 2000.
: Column 4: Number of members of the group.
: Column 5: Brightest member of the group
: Column 6: Redshift of the group.
: Column 7: Distance of the group (Millions of light-years).
: Column 8: Cross-Identifications with other catalogs.

(Sources for data columns:)

Observational history

Before the Southern Supercluster Strand was identified, its two major components were already known: the Southern Supercluster which was discovered in 1953 by astronomer Gérard de Vaucouleurs, and the Telescopium−Grus Cloud which was discovered by astronomer Brent Tully with colleague Richard Fisher in 1987.

In 1987, astronomer Brent Tully with colleague Richard Fisher discovered and described the Cetus-Aries Cloud, a minor filament that connects the Southern Supercluster with the Telescopium−Grus Cloud''.'' In 1992, Fouque et al. grouped the Cetus-Aries Cloud, also known as cloud 52 in the book ''The Nearby Galaxies Atlas'' along with the Southern Supercluster's three major clusters, the Fornax, Eridanus, and Dorado clusters (clouds 51 and 53).

In 2013, Courtois et al. discovered based on the distribution of galaxies inferred from their redshifts the Southern Supercluster Strand, which branches off into two forks that emerge from the Centaurus Cluster. These two forks were designated SSCa and SSCb, also known as the Southern Supercluster and the Telescopium−Grus Cloud. In 2017, Pomarède et al. revealed that the Southern Supercluster strand along with another filament known as the Antila Strand, extend all the way to the Perseus–Pisces Supercluster.

See also

* Large-scale structure of the universe
* Galaxy filament

References

{{DEFAULTSORT:Southern Supercluster
Galaxy filaments
Large-scale structure of the cosmos
Astronomical objects discovered in 2013
Southern Supercluster
Southern Supercluster Strand