Snowden

A Snowden is a unit of soft X-ray emissivity, equivalent to ${\displaystyle 10^{-6}}$ ROSAT counts ${\displaystyle s^{-1}arcmi{n}^{-2}}$.^[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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