1205.4262 (Matthew R. George et al.)

Galaxies in X-ray Groups II: A Weak Lensing Study of Halo Centering    [PDF]

Matthew R. George, Alexie Leauthaud, Kevin Bundy, Alexis Finoguenov, Chung-Pei Ma, Eli S. Rykoff, Jeremy L. Tinker, Risa H. Wechsler, Richard Massey, Simona Mei

Locating the centers of dark matter halos is critical for understanding the mass profiles of halos as well as the formation and evolution of the massive galaxies that they host. The task is observationally challenging because we cannot observe halos directly, and tracers such as bright galaxies or X-ray emission from hot plasma are imperfect. In this paper we quantify the consequences of miscentering on the weak lensing signal from a sample of 129 X-ray selected galaxy groups in the COSMOS field with redshifts 0View original: http://arxiv.org/abs/1205.4262