This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Abell cluster | |
|---|---|
| Name | Abell cluster |
| Epoch | J2000 |
| Constellation | Various |
| Redshift | Various |
| Distance | Various |
| Mass | Various |
| Richness | Various |
| Notes | Catalogued by George O. Abell |
Abell cluster is a term used to describe galaxy clusters listed in the catalogues compiled by George O. Abell and subsequent extensions, representing some of the richest and most massive bound systems in the Universe. These concentrations of galaxies were instrumental in early studies by observatories such as the Palomar Observatory and influenced surveys like the Sloan Digital Sky Survey and projects using the Hubble Space Telescope, the Chandra X-ray Observatory, and the Planck mission. Abell clusters provide testbeds for theories developed by researchers associated with institutions including the California Institute of Technology, the Harvard–Smithsonian Center for Astrophysics, and the Max Planck Society.
The Abell catalogue originated from photographic plate work at the Palomar Observatory and enumerated rich, concentrated systems identified on the Palomar Observatory Sky Survey. The catalogue was expanded by later efforts at organizations such as the National Optical Astronomy Observatory and influenced data sets from the Two Micron All Sky Survey and the ROSAT mission. Abell clusters appear in multiple wavelength regimes observed by facilities like the Very Large Array, the Atacama Large Millimeter/submillimeter Array, and the European Southern Observatory, and are cross-referenced in compilations at the NASA/IPAC Extragalactic Database and the SIMBAD Astronomical Database.
The original Abell catalogue, assembled by George O. Abell at the Lick Observatory and published via the Astrophysical Journal, assigned clusters richness classes and distance classes based on apparent galaxy counts and magnitudes. This classification scheme was used alongside redshift campaigns by teams at the Cerro Tololo Inter-American Observatory and the Anglo-Australian Observatory to calibrate selection functions and completeness corrections. Later catalogs and revisions from groups at the University of Cambridge and the Max Planck Institute for Astrophysics refined cluster membership using spectroscopy from instruments on the Keck Observatory and the European Southern Observatory's Very Large Telescope.
Abell clusters host hundreds to thousands of member galaxies drawn from morphological classes seen in catalogues such as those compiled by Edwin Hubble and studied by observers at the Mount Wilson Observatory. Their baryonic content includes hot intracluster medium detected in X-rays by Chandra X-ray Observatory and XMM-Newton, and relativistic plasma evidenced in radio surveys from the Low-Frequency Array and the Very Large Array. Dark matter dominance in these systems has been inferred from lensing studies using data from the Hubble Space Telescope and the Subaru Telescope, and modeled with simulations produced by groups at the Princeton University and the Lawrence Berkeley National Laboratory.
The growth of Abell clusters is interpreted within frameworks developed by cosmologists at the Institute for Advanced Study and the Perimeter Institute, building on ideas from James Peebles and the Cold Dark Matter paradigm. Numerical simulations by teams at the Max Planck Institute for Astrophysics and the Flatiron Institute reproduce hierarchical assembly via mergers traced in surveys such as the Canada–France–Hawaii Telescope Legacy Survey and the Dark Energy Survey. Major merger events analogous to the Bullet Cluster highlight dynamical processes involving shocks observed by the Chandra X-ray Observatory and radio relics investigated with the Giant Metrewave Radio Telescope.
Identification and characterization of Abell clusters employ optical imaging from the Sloan Digital Sky Survey and spectroscopy from facilities like the Keck Observatory and the European Southern Observatory's Very Large Telescope. X-ray measurements from Chandra X-ray Observatory and XMM-Newton quantify intracluster gas, while Sunyaev–Zel'dovich effect observations by the South Pole Telescope and the Atacama Cosmology Telescope yield pressure and mass estimates. Weak and strong gravitational lensing analyses using the Hubble Space Telescope and ground-based programs at the Subaru Telescope complement surveys by the Dark Energy Survey and missions such as Planck.
Several prominent entries from the catalogue have been the focus of multiwavelength campaigns by teams at institutions like the Harvard–Smithsonian Center for Astrophysics, Max Planck Society, and the European Southern Observatory. Observed systems have been compared to archetypes like the Coma Cluster and collision examples such as the Bullet Cluster in work involving researchers from Columbia University, University of Chicago, and the University of Tokyo. Studies of brightest cluster galaxies often cite results from the Hubble Space Telescope and the Spitzer Space Telescope and involve collaborations with the Space Telescope Science Institute and the Jet Propulsion Laboratory.
Abell clusters serve as tracers in mapping superclusters and voids studied by projects including the 2dF Galaxy Redshift Survey and the Sloan Digital Sky Survey, informing constraints on parameters measured by Planck and analyzed by teams at the European Space Agency. Their mass function and clustering statistics test predictions from the Lambda-CDM model developed by theorists at the Institute for Advanced Study and Princeton University, and influence studies of dark energy spearheaded by collaborations such as the Dark Energy Survey and the Euclid mission.