Halo Structures of Gravitational Lens Galaxies

Details Halo Structures of Gravitational Lens Galaxies Halo Structures of Gravitational Lens Galaxies

2005-10-31

arxiv.org/abs/astro-ph/0511001v2

Astrophys.J.642:22-29,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/500968

We explore the halo structure of four gravitational lenses with well-observed, thin Einstein rings. We find that the gravitational potentials are well described by ellipsoidal density distributions in the sense that the best-fit nonellipsoidal models have parameters consistent with their ellipsoidal counterparts. We find upper limits on the standard parameters for the deviation from an ellipse of |a_3/a_0|<0.023, 0.019, 0.037, and 0.035, and |a_4/a_0|<0.034, 0.041, 0.051, and 0.064 for SDSS J0924+0219, HE0435-1223, B1938+666, and PG1115+080, respectively. We find that the lens galaxies are at the centers of their dark matter halos, and obtain upper limits for the offset of each center of mass from the center of light of |Delta x|<0.004, 0.005, 0.009, and 0.005 arcsec, corresponding to 22, 29, 70, and 23 pc. These limits also exclude the possibility of any significant lopsidednessof the dark matter halos and set an upper limit of f_sat

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