In this Letter we present calibrated observations of the average mass of galaxies with 22< I < 25 in the Hubble Deep Field. We measure the mean mass profile using the statistical gravitational lens distortion of faint blue background galaxies, based on 2221 foreground-background pairs. The observed weak lensing distortion is calibrated via full 3-D simulations and other HST data on a foreground cluster of known mass. Inside a projected radius of 5 arcsec we find a 3\σ detection of shear. Fitting to an isothermal mass distribution, we find a shear of 0.066+0.018-0.019 at a radius of truncated isothermal model are \σ_v =185⁺³⁰₋₃₅ km s⁻¹, rₒᵤₜₑᵣ corresponds to an average galaxy mass interior to 20 h⁻¹ kpc of 5.9+2.5-2.7\× 10¹¹ h⁻¹ M_ødot. Inside 10 h⁻¹ kpc, we find an average rest-frame V band mass-to-light ratio of 11.4+6.0-6.7 h (M/L_V)_ødot.
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Dell’Antonio et al. (1996) studied this question.
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