User:Fucherastonmeym87/Arrowhead Supercluster

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The Laniakea Supercluster (, Hawaiian for open skies or immense heaven) is the galaxy supercluster that is home to the Milky Way and approximately 100,000 other nearby galaxies. It was defined in September 2014, when a group of astronomers including R. Brent Tully of the University of Hawaiʻi, Hélène Courtois of the University of Lyon, Yehuda Hoffman of the Hebrew University of Jerusalem, and Daniel Pomarède of CEA Université Paris-Saclay published a new way of defining superclusters according to the relative velocities of galaxies.

Name and Obsevational History
The name Arrowhead refers to the shape of the supercluster as inferred from a Wiener Filter analysis of the motions of galaxies derived from the Cosmicflows-2 Database which also led to the identification of the Laniakea Supercluster.

Characteristics
The Arrowhead Supercluster encompasses approximately 100,000 galaxies stretched out over 25 Mpc. It has the approximate mass of 1015 solar masses, or 100,000 times that of our galaxy, which is almost the same as that of the Horologium Supercluster. It consists of four subparts, which were known previously as separate superclusters:


 * Virgo Supercluster, the part in which the Milky Way resides.
 * Hydra–Centaurus Supercluster
 * the Great Attractor, Laniakea's central gravitational point near Norma
 * Antlia Wall, known as Hydra Supercluster
 * Centaurus Supercluster
 * Pavo–Indus Supercluster
 * Southern Supercluster, including Fornax Cluster (S373), Dorado and Eridanus clouds.

Despite not containing any major cluster of galaxies, the most prominent group in the supercluster is the NGC 5353/54 Group with an estimated mass of roughly 30 trillion suns (3×1013 M☉).

Location
The Arrowhead Supercluster lies between 3 major basins of attraction; the Laniakea Supercluster, the Coma Supercluster and Perseus–Pisces Supercluster. Above and below the Arrowhead Superlcuster lie two voids, the Upper Arrowhead Void and the Lower Arrowhead Void.

Arrowhead is itself a constituent part of the Pisces–Cetus Supercluster Complex, a galaxy filament.