| X-ray Masses for Clusters |
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| • | Fabricant,
Lecar, and Gorenstein: |
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| – | Bremsstrahlung
spectrum is roughly flat up to X-ray |
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| energies,
above which it cuts off exponentially.
Cut-off is |
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| related
to temperature.
E = hν ~ kBT. The measurement is |
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| a
projection onto 2D space.
Integrating emissivity and |
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| converting
to intensity (surface brightness at the projected |
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| radius
a): |
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