Figure 2 - uploaded by Wes Tobin
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1: Spectrum of a galaxy in Abell 154. The spectrum of this example galaxy shows both emission and absorption features that can be used to calculate recessional velocity. The horizontal axis shows wavelength in angstroms and the vertical axis represents the intensity of the spectrum.
Source publication
Galaxy clusters are the largest, gravitationally bound structures in the universe. Galaxy cluster growth is believed to occur hierarchically through the merging of smaller clusters to form large clusters. Cluster interactions constrain and quantify current knowledge in dark matter and dark energy, which provides a basis for the large-scale structur...
