Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-06-17
Astronomy and Astrophysics
Astrophysics
16 pages including 3 tables, 2 eps figures and 2 jpeg images. Submitted to the Astronomical Journal
Scientific paper
10.1086/118647
In a number of multiply imaged quasar systems, a significant contribution to the lensing potential is provided by groups and clusters of galaxies associated with the primary lens. As part of an ongoing effort to gather observational data on these systems, we present spectroscopy and near-infrared and optical photometry of galaxies in the field of the quadruple lens system B 1422+231. The spectra show that the primary lens and five nearby galaxies belong to a compact group at z = 0.338. The median projected radius of this group is 35 h^{-1} kpc and its velocity dispersion is 550 km/s. A straightforward application of the virial theorem yields a group mass of 1.4 x 10^{13} h^{-1} M(sun), which provides sufficient external shear to produce the observed image configuration. This data rules out a class of models and improves the system's prospects for a measurement of the Hubble constant.
Blandford Roger. D.
Cohen Judith Gamora
Hogg David Wardell
Kundic Tomislav
Larkin James E.
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