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| Hydra–Centaurus Supercluster | |
|---|---|
| Name | Hydra–Centaurus Supercluster |
| Type | Galaxy supercluster |
| Constellation | Hydra; Centaurus; Virgo; Crater; Corvus |
| Notable clusters | Hydra Cluster; Centaurus Cluster; Antlia Cluster; Norma Cluster; Fornax Cluster |
| Distance | ~40–150 Mly (varies by component) |
| Redshift | z ~ 0.003–0.03 |
| Mass | ~10^15–10^16 M☉ (est.) |
| Major galaxies | NGC 3311; NGC 4696; NGC 3258; NGC 3268; NGC 1275 |
Hydra–Centaurus Supercluster The Hydra–Centaurus Supercluster is a prominent nearby galaxy supercluster complex located in the southern celestial hemisphere spanning the constellations Hydra and Centaurus, closely related to the Local Supercluster, the Virgo Cluster, and the region associated with the Great Attractor. It contains rich clusters such as the Hydra Cluster and the Centaurus Cluster and is a major component in maps of large-scale structure that include features like the Perseus–Pisces Supercluster, the Coma Supercluster, and the Shapley Concentration.
The Hydra–Centaurus Supercluster is identified through surveys by institutions like the Carnegie Institution, the European Southern Observatory, the Anglo-Australian Observatory, the Palomar Observatory, and the Max Planck Institute, and features in catalogues compiled with data from the Sloan Digital Sky Survey, the Two Micron All Sky Survey, the 2dF Galaxy Redshift Survey, and HIPASS. It is discussed alongside structures such as the Local Group, the Virgo Supercluster, the Fornax Cluster, the Norma Cluster, the Shapley Supercluster, and the Pisces–Cetus Supercluster in works by astronomers affiliated with Harvard–Smithsonian Center for Astrophysics, the Australian National University, and the Space Telescope Science Institute.
The complex includes major clusters and groups: the Hydra Cluster (Abell 1060), the Centaurus Cluster (Abell 3526), the Antlia Cluster (Abell S0636), the Norma Cluster (Abell 3627), and adjacent groups catalogued by George Abell, Fritz Zwicky, Gérard de Vaucouleurs, and Edwin Hubble. Prominent galaxies within member clusters include NGC 3311, NGC 4696, NGC 3258, NGC 3268, and objects studied with the Hubble Space Telescope, the Chandra X-ray Observatory, and XMM-Newton. Substructures map to filaments that connect to the Virgo Cluster, the Eridanus Supergroup, the Dorado Group, and the groupings examined by Vera C. Rubin Observatory teams and the European Space Agency.
Distance estimates derive from redshift surveys using techniques developed by Allan Sandage, Martin Rees, and Sandra Faber and through standard candles like Cepheids and Type Ia supernovae observed with instruments from Keck Observatory, the Very Large Telescope, and the Subaru Telescope. Size determinations consider work by Michael S. Briggs, Brent Tully, and R. Brent Tully’s group, with mass estimates informed by galaxy velocity dispersions, X-ray temperatures measured by Chandra, and weak lensing studies by teams including those at Caltech, Johns Hopkins University, and the University of Chicago. Comparative structures include the Coma Cluster (Abell 1656), Perseus Cluster (Abell 426), and the Shapley Concentration, while catalogs from NASA, ESA, and the International Astronomical Union provide distance scales tied to the Hubble Constant debates involving Adam Riess and the Planck Collaboration.
Galaxy motions within the Hydra–Centaurus complex reveal peculiar velocities studied in the context of the Cosmic Microwave Background frame established by COBE, WMAP, and Planck missions. Analyses by Lynden-Bell, Hoffman, and Dekel examine bulk flows, while N-body simulations by the Virgo Consortium, Illustris, and EAGLE projects model infall patterns toward attractors associated with the Norma Cluster and the Great Attractor region. Observational programs at Arecibo Observatory, Parkes Observatory, and MeerKAT map HI content and rotation curves of spiral members, complementing optical spectroscopy from the Anglo-Australian Telescope and the Magellan Telescopes.
The Hydra–Centaurus complex lies adjacent to and interacts gravitationally with the Local Supercluster (the Virgo Supercluster) and contributes to the mass concentration often called the Great Attractor, a dynamical feature also linked to the Norma Cluster and the Shapley Supercluster in analyses by Lynden-Bell, Dressler, and Tonry. Studies involving the 6dF Galaxy Survey, the Cosmicflows projects led by Courtois and Tully, and analyses by Lahav and Saunders integrate data from the Two Micron All Sky Survey and the IRAS Point Source Catalog to trace the flow of galaxies toward this overdensity.
Recognition of the region as a coherent overdensity stems from early surveys by Edwin Hubble, George Abell, Fritz Zwicky, and subsequent redshift mapping by Margaret Geller and John Huchra, with refinement from later work by Gérard de Vaucouleurs and Richard Brent Tully. Important observational milestones include X-ray identification by the Einstein Observatory, ROSAT, and Chandra, radio observations at Parkes and Arecibo, and spectroscopic campaigns by the Sloan Digital Sky Survey, 2dFGRS, and 6dFGS, as well as catalogs produced by the NASA/IPAC Extragalactic Database and SIMBAD.
Current research uses multiwavelength data from Hubble, Chandra, XMM-Newton, ALMA, JWST, and ground-based facilities like VLT, Keck, and the Subaru Telescope, and incorporates simulation comparisons from IllustrisTNG and Millennium runs to study galaxy evolution, intracluster medium physics, and large-scale flows. Projects by teams at Harvard, MIT, Caltech, Australian National University, ESO, and ESA examine links to cosmic web features studied by Eisenstein, Peebles, and Springel, while surveys from the Vera C. Rubin Observatory and Euclid aim to refine maps of dark matter and cosmic acceleration relevant to ΛCDM cosmology and ongoing debates involving dark energy research led by Planck and DES collaborations.
Category:Galaxy superclusters