Groups of Galaxies

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Groups of Galaxies Most galaxies in the local universe, including our own Milky Way, are members of poor galaxy groups. The realization that many groups are X-ray sources has led to considerable interest in these systems. The X-ray emission in groups is typically extended on scales of hundreds of kiloparsecs. X-ray spectroscopy suggests the emission mechanism is most likely a combination of thermal bremsstrahlung and line emission. This interpretation requires that the entire volume of groups be filled with a hot, low-density gas often referred to as the intragroup medium in analogy to the intracluster medium found in richer systems.    [Ref  8]

HCG 16

HCG 16

Stephan's Quintet

[FGH2007] 99

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