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| CL0024+17 | |
|---|---|
| Name | CL0024+17 |
| Other names | ZwCl 0024.0+1652 |
| Type | Galaxy cluster |
| Constellation | Pisces (constellation) |
| Redshift | 0.39 |
| Distance | 4.1 Gpc |
| Mass | ~1e15 M☉ (lens estimates) |
| Epoch | Cosmology |
CL0024+17 is a massive galaxy cluster in the constellation Pisces (constellation) known for producing strong gravitational lensing features such as multiple arcs and Einstein rings. It has been the subject of extensive observational campaigns with facilities including the Hubble Space Telescope, the Chandra X-ray Observatory, the Keck Observatory, and the Very Large Telescope. CL0024+17 has played a prominent role in debates over the distribution of dark matter in clusters, the use of clusters as cosmological probes, and the interpretation of complex lensing geometries.
Located at a redshift of approximately 0.39, CL0024+17 was cataloged in early optical surveys and later identified as a powerful lens producing large arc-like features. Its observables include strong-lensing arcs, weak-lensing shear patterns, X-ray emission from the hot intracluster plasma, and spectroscopically confirmed member galaxies. The cluster has been modeled with parametric and non-parametric mass reconstructions using data from Hubble Space Telescope imaging, Keck Observatory spectroscopy, and imaging from the Canada–France–Hawaii Telescope.
Early identification traces to photographic surveys such as the Zwicky catalog and follow-up optical work with instruments at the Palomar Observatory and the Cerro Tololo Inter-American Observatory. High-resolution imaging with the Hubble Space Telescope Advanced Camera for Surveys revealed prominent arcs that motivated spectroscopic confirmation at Keck Observatory and follow-up redshift measurements. Subsequent campaigns used the Chandra X-ray Observatory and XMM-Newton to map hot gas, while radio and submillimeter observations with the Very Large Array and the Atacama Large Millimeter/submillimeter Array provided constraints on active galaxies and Sunyaev–Zel'dovich measurements with the Planck (spacecraft) mission and the South Pole Telescope.
CL0024+17 is best known for a near-complete Einstein ring and multiple-image systems exploited to reconstruct the cluster's projected mass. Lens models have been produced by teams using parametric approaches inspired by halo models from Navarro–Frenk–White parametrizations and free-form inversions developed by groups associated with Gravitational Lensing research at institutions like the Space Telescope Science Institute and the Max Planck Institute for Astrophysics. Weak-lensing analyses using wide-field imaging from instruments on the Subaru Telescope and the Canada–France–Hawaii Telescope have mapped mass to larger radii and compared lensing mass to X-ray mass proxies. The lensing-derived mass profile stimulated comparisons with expectations from the Lambda-CDM model and results from numerical simulations run on supercomputers at centers such as the National Center for Supercomputing Applications.
CL0024+17 generated controversy when a ring-like feature in a mass reconstruction was interpreted as evidence for dark-matter substructure or a collision-induced caustic. This claim prompted responses from research groups working on cold dark matter at institutes such as the Harvard–Smithsonian Center for Astrophysics and the Kavli Institute for Particle Astrophysics and Cosmology, who reanalyzed lensing data and argued for alternative explanations including projection effects and modeling artifacts. Debates involved comparisons to predictions for self-interacting dark matter from theoretical work at the Institute for Advanced Study and constraints from laboratory searches like those at CERN and Fermi National Accelerator Laboratory. The controversy stimulated improved methodologies in lens inversion, cross-calibration with X-ray diagnostics from Chandra X-ray Observatory, and hydrodynamical simulations by groups at the Max Planck Institute for Astrophysics and the Center for Computational Astrophysics.
Member galaxies in CL0024+17 include luminous ellipticals and spiral galaxies identified through spectroscopy at Keck Observatory and the Very Large Telescope. Studies of the cluster's luminosity function connected to work on galaxy evolution by teams affiliated with the European Southern Observatory and the Institute of Astronomy, Cambridge. The intracluster medium has been mapped in X-rays by Chandra X-ray Observatory and XMM-Newton, revealing temperature and metallicity structure used to infer dynamical state and to compare to Sunyaev–Zel'dovich measurements from the Atacama Cosmology Telescope. Observations highlighted interactions between galaxies and the hot plasma, linking to processes studied in the context of ram-pressure stripping by groups at the Max Planck Institute for Extraterrestrial Physics.
CL0024+17 has been used as a laboratory for testing models of structure formation under the Lambda-CDM model and for calibrating mass-observable relations used in cluster cosmology by collaborations such as the Dark Energy Survey and the Planck Collaboration. Its rich lensing data provide constraints on the mass function leveraged by surveys like Sloan Digital Sky Survey and the Euclid mission planning. Methodological advances developed in the analysis of CL0024+17—spanning lens inversion, hydrodynamical modeling, and multiwavelength cross-calibration—continue to inform studies from the James Webb Space Telescope era and large surveys conducted with the Vera C. Rubin Observatory.