\documentclass{scrartcl}
\usepackage{color}
\usepackage{multicol}
\usepackage[final]{graphicx}
\usepackage{pst-plot,pstricks}
\begin{document}
	\psset{xunit=1cm,yunit=1cm}
	\begin{pspicture}(-2.5,-0.5)(2.5,4.5)
		\psaxes[Dx=5,Dy=5]{->}(0,0)(-2.5,-0.5)(2.5,4.5)
		\psdot[dotstyle=x,dotsize=0.2](-1.5,2)
		\psdot[dotstyle=x,dotsize=0.2](0,4)
		\psline{->}(0,0)(-1.5,2)
		\psline(-1.5,2)(0,2)
		\psline{->}(-1.5,2)(0,4)
		\psarc(-1.5,2){1}{0}{53}
		\rput[r](-1,3){$r_{\infty}$}
		\rput[l](-0.5,2.5){$\varphi_{\infty}$}
		\rput[l](0,4){$\omega_x$}
		\rput[l](2.2,0.3){$\sigma$}
		\rput[r](-0.1,4.5){$j\omega$}
	\end{pspicture}
\end{document}
