Clusters of Galaxies Nearby Cluster A2199 and Surroundings

Clusters of galaxies are the most massive gravitationally bound objects in the universe. OIR scientists study images and spectra of clusters to determine their masses, distribution, and the properties of the clusters and their member galaxies. The large velocities of cluster galaxies provided the first evidence of dark matter. Today, scientists continue to study clusters to understand how dark matter and galaxies are connected. Clusters are rare objects that have been formed recently; the abundance of clusters and their recent evolution therefore measure the amount of strucuture in the universe and its growth history.


Project Links

C3PO: Chandra Cluster Cosmology Project Optical survey

SHELS: Smithsonian HEctospec Lensing Survey



OIR: Ken Rines, Margaret Geller, Dan Fabricant, Michael Kurtz, Nelson Caldwell, Pauline Barmby, Karen Masters, John Huchra, Giovanni Fazio, HEA: Alexey Vikhlinin, Christine Jones, Bill Forman, Maxim Markevitch, RG: Tony Stark


Color shows X-ray emission from A2199 and nearby groups. Yellow contours show the density of galaxies in these systems.


Section Photo