Composition
There are three main components of a galaxy cluster. They are tabulated below:
| Name of the components | Mass fraction | Description |
|---|---|---|
| Galaxies | 1% | In optical observations only galaxies are visible |
| Intergalactic gas in ICM | 9% | Plasma between the galaxies at high temperature. Emit x-ray radiation through thermal bremsstrahlung mechanism. |
| Dark matter | 90% | Most massive component, cannot be detected optically, inferred through gravitational interactions. |
Read more about this topic: Galaxy Cluster
Famous quotes containing the word composition:
“Pushkin’s composition is first of all and above all a phenomenon of style, and it is from this flowered rim that I have surveyed its seep of Arcadian country, the serpentine gleam of its imported brooks, the miniature blizzards imprisoned in round crystal, and the many-hued levels of literary parody blending in the melting distance.”
—Vladimir Nabokov (1899–1977)
“Modern Western thought will pass into history and be incorporated in it, will have its influence and its place, just as our body will pass into the composition of grass, of sheep, of cutlets, and of men. We do not like that kind of immortality, but what is to be done about it?”
—Alexander Herzen (1812–1870)
“Every thing in his composition was little; and he had all the weaknesses of a little mind, without any of the virtues, or even the vices, of a great one.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)