The time delays of gravitational lens HE 0435-1223: An early-type galaxy with a rising rotation curve

`We present Hubble Space Telescope images and 2 years of optical photometry of the quadruple quasar HE 0435-1223. The time delays between the intrinsic quasar variations are Delta t(AD) = -14.37(-0.85)(+0.75), Delta t(AB)= -8.00(-0.82)(+0.73), and Delta t(AC) = 2.10(-0.71)(+0.78) days. We also observed nonintrinsic variations of similar to 0.1 mag yr(-1) that we attribute to microlensing. Instead of the traditional approach of assuming a rotation curve for the lens galaxy and then deriving the Hubble constant (H-0), we assume H-0 ( 72 +/- 7) km s(-1) Mpc(-1) and derive constraints on the rotation curve. On the scale over which the lensed images occur (1."2 = 5 h(-1) kpc similar or equal to 1.5R(e)), the lens galaxy must have a rising rotation curve, and it cannot have a constant mass- to- light ratio. These results add to the evidence that the structures of earlytype galaxies are heterogeneous.