Weak Gravitational Lensing by Galaxies - Implications for Dark Matter Halos

Mathematics – Logic

Scientific paper

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Scientific paper

A detection of weak, tangential distortion of the images of cosmologically distant, faint galaxies caused by gravitational lensing by foreground galaxies is reported. The imaging data consist of a 24 ksec integration in Gunn-r of a single blank field obtained with the COSMIC imaging spectrograph on the Hale 5-m telescope. The orientations of faint (23 < r <= 24) galaxies relative to brighter (20 <= r <= 23) galaxies is investigated. The distribution of the orientations of the faint galaxy images is inconsistent with a uniform distribution at a confidence level of 99.9%. Averaged over annuli of inner radius 5" and outer radius 34" (centered on the bright galaxies), an image polarization of < p right > = 0.011 +/- 0.006 (95% confidence bounds) is found for the faint galaxies. The variation of < p right > with both differential lens-source separation and the maximum radius of the annulus is investigated. From Monte Carlo simulations of galaxy-galaxy lensing that incorporate measured properties of local galaxies and modest extrapolations of the observed redshift distribution of faint galaxies, formal best-fit parameters for the dark matter halos associated with the lens galaxies are obtained. For L(*) galaxies a characteristic circular velocity of V(*) ~ 220+/- 80 km/s and outer scale radius of s(*) >= 100h(-1) kpc is found. These parameters imply a typical mass for the lens galaxies within 100 h(-1) kpc of order 1.0(+1.2}_{-0.5) x 10(12) h(-1) M_sun (90% confidence bounds), in good agreement with recent dynamical estimates of the masses of local spiral galaxies

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