The Hubble Constant Inferred from 18 Time-delay Lenses

We present a simultaneous analysis of 18 galaxy lenses with time-delay measurements. For each lens, we derive mass maps using pixelated simultaneous modeling with shared Hubble constant. We estimate the Hubble constant to be 66⁺⁶ _-4 km s^-1 Mpc^-1 (for a flat universe with Ω _m = 0.3, Ω_Λ = 0.7). We have also selected a subsample of five relatively isolated early-type galaxies, and by simultaneous modeling with an additional constraint on isothermality of their mass profiles, we get H ₀ = 76⁺³ _-3 km s^-1 Mpc^-1.