Recent content by Astaroth.

Thank you very much.

Only you can help me.

\sigma (r) = \left\{\begin{matrix}\sigma (r), &r < Rt \\ \sigma (Rt)(1+(Rt-r)/SCL), & Rt < r < Rt+SCL\\ 0, & r > Rt+SCL \end{matrix}\right.

What do I do? The exponential law of density distribution \sigma (r)) = \sigma_{0} \exp(-\frac{r}{L}) I want to apply a linear truncation for \sigma (r) \sigma (r) = \left\{\begin{matrix}\sigma (r), &r < Rt \\ \sigma (Rt)(1+(Rt-r)/SCL), & Rt < r < Rt+SCL\\ 0, & r...

Thank you very much. And if the \sigma (r) = \sigma_ {0} * \ exp (- \frac {Rt} {L}) * (1 + (Rt-r) / SCL) The result will differ greatly?

Thank you. I have been modeling the rotation of galaxies. The journal «Freeman, K. C. Astrophysical Journal, vol. 160, p.811» http://articles.adsabs.harvard.edu//full/1970ApJ...160..811F/0000813.000.html described, but I need for different density profiles \sigma. \sigma (r)) = \sigma_{0}...

Hello, need your help. J_1 and J_0 - Bessel function Necessary to solve analytically or to be able to simplify the numerical solution.