October 19, 2005
Hydra A is a galaxy cluster that is 840 million light years from Earth (redshift = .054). The cluster gets its name from the strong radio source, Hydra A, that originates in a galaxy near the center of the cluster. Optical observations show a few hundred galaxies in the cluster. Chandra X-ray observations reveal a large cloud of hot gas that extends throughout the cluster. The gas cloud is several million light years across and has a temperature of about 40 million degrees in the outer parts decreasing to about 35 million degrees in the inner region.
Topics: Environment, Galaxy groups and clusters, Galaxy clusters, Large-scale structure of the cosmos, Hydra Cluster, Redshift, Open cluster, Galaxy