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We employ Schwarzschild's method of orbit modeling to constrain the massprofiles of the central lens galaxies in Q0957+561 and PG 1115+080. We combinethe measured central projected stellar velocity dispersions of these galaxieswith the self-similar radial profiles of the rms velocity and of theGauss-Hermite moment h_4 observed in nearby galaxies for 0 < R < 2 R_eff. ForQ0957+561, we find a 16% uncertainty in the galaxy mass, and formal 2-sigmalimits on the Hubble constant of H_0 = (61 +13/-15) km/s/Mpc. For PG 1115+080,we find that none of the viable lens models can be ruled out, so that H_0 isnot yet strongly constrained by this system.

Constraints onH0from the Central Velocity Dispersions of Lens Galaxies

Constraints onH₀from the Central Velocity Dispersions of Lens Galaxies