# Rotation curves

by Astaroth.
Tags: curves, rotation
 P: 10 Hello. I need help with a truncation of the surface density of a thin exponential disk. To calculate the speed. At $\sigma (r)) = \sigma_{0} \exp(-\frac{r}{L})$ Help to calculate the formula for $\sigma (r) = \sigma (Rt)*(1+(Rt-r)/SCL)= \sigma_{0} * \exp(-\frac{Rt}{L})*(1+(Rt-r)/SCL)$ and $\sigma (r) = \sigma (Rt) = \sigma_{0} * \exp(-\frac{Rt}{L})$

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