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An analytic galaxy model with $\rho \sim r^{-1}$ at small radii and $\rho\sim r^{-3.5}$ at large radii is presented. The asymptotic density fall-off isslower than the Hernquist model, but faster than the Navarro-Frenk-White (NFW)profile for dark matter haloes, and so in accord with recent evidence fromcosmological simulations. The model provides the zeroth-order term in abiorthornomal basis function expansion, meaning that axisymmetric, triaxial andlopsided distortions can easily be added (much like the Hernquist model itselfwhich is the zeroth-order term of the Hernquist-Ostriker expansion). Theproperties of the spherical model, including analytic distribution functionswhich are either isotropic, radially anisotropic or tangentially anisotropic,are discussed in some detail. The analogue of the mass-concentration relationfor cosmological haloes is provided.

The Super-NFW model: an analytic dynamical model for cold dark matter haloes and elliptical galaxies