Luminous Satellites of Early-Type Galaxies I: Spatial Distribution

Details Luminous Satellites of Early-Type Galaxies I: Spatial Distribution Luminous Satellites of Early-Type Galaxies I: Spatial Distribution

2011-02-07

arxiv.org/abs/1102.1426v2

Astrophys.J.731:44,2011

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

21 pages, 16 figures, Accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/731/1/44

We study the spatial distribution of faint satellites of intermediate redshift (0.199.99% confidence level). Defining phi to be the offset between the major axis of the satellite spatial distribution and the major axis of the host light profile, we find a maximum posterior probability of phi = 0 and |phi| less than 42 degrees at the 68% confidence level. The alignment of the satellite distribution with the light of the host is consistent with simulations, assuming that light traces mass for the host galaxy as observed for lens galaxies. The anisotropy of the satellite population enhances its ability to produce the flux ratio anomalies observed in gravitationally lensed quasars.

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