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Based on 58 SLACS strong-lens early-type galaxies with direct total-mass andstellar-velocity dispersion measurements, we find that inside one effectiveradius massive elliptical galaxies with M_eff >= 3x10^10 M_sun arewell-approximated by a power-law ellipsoid with an average logaritmic densityslope of <gamma'_LD> = -dlog(rho_tot)/dlog(r)=2.085^{+0.025}_{-0.018} (randomerror on mean) for isotropic orbits with beta_r=0, +-0.1 (syst.) andsigma_gamma' <= 0.20^{+0.04}_{-0.02} intrinsic scatter (all errors indicate the68 percent CL). We find no correlation of gamma'_LD with galaxy mass (M_eff),rescaled radius (i.e. R_einst/R_eff) or redshift, despite intrinsic differencesin density-slope between galaxies. Based on scaling relations, the averagelogarithmic density slope can be derived in an alternative manner, fullyindependent from dynamics, yielding <gamma'_SR>=1.959 +- 0.077. Agreementbetween the two values is reached for <beta_r> =0.45 +- 0.25, consistent withmild radial anisotropy. This agreement supports the robustness of our results,despite the increase in mass-to-light ratio with total galaxy mass: M_eff ~L_{V,eff}^(1.363+-0.056). We conclude that massive early-type galaxies arestructurally close-to homologous with close-to isothermal total densityprofiles (<=10 percent intrinsic scatter) and have at most some mild radialanisotropy. Our results provide new observational limits on galaxy formationand evolution scenarios, covering four Gyr look-back time.

The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius