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C.E. Grant, M.W. Bautz (MIT)
Gravitational lenses that produce multiple images of background quasars can be an invaluable cosmological tool, however, deriving cosmological parameters requires modeling the potential of the lens itself. It has been estimated that up to a quarter of lensing galaxies are associated with a group or cluster which perturbs the gravitational potential. Detection of X-ray emission from the group or cluster can be used to better model the lens. We report on the first detection in X-rays of the groups associated with the lensing systems PG 1115+080 and B1422+231 at z=0.3. We compare the spatial and spectral characteristics of the X-ray emission to the properties of the group galaxies, to lens models, and to the general properties of groups at lower redshift.
Bulletin of the American Astronomical Society,
© 2003. The American Astronomical Soceity.