Snowden

A Snowden is a unit of soft X-ray emissivity, equivalent to [math]\displaystyle{ 10^{-6} }[/math] ROSAT counts [math]\displaystyle{ s^{-1} arcmin^{-2} }[/math].^[1] These units were chosen by S. L. Snowden when working with the ROSAT mission to create the ROSAT All-Sky Survey in order to make the surface brightness values fit into a two byte integer.

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