The external shear acting on gravitational lens B1422+231

Tomislav Kundić; David W. Hogg; Roger D. Blandford; Judith G. Cohen; Lori M. Lubin; James E. Larkin

doi:10.1086/118647

The external shear acting on gravitational lens B1422+231

Tomislav Kundić, David W. Hogg, Roger D. Blandford, Judith G. Cohen, Lori M. Lubin, James E. Larkin

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Abstract

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 B1422+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 35h^-1 kpc and its velocity dispersion is ∼550 km s^-1. A straightforward application of the virial theorem yields a group mass of 1.4× 10¹³h^-1M_⊙, 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.

Original language	English (US)
Pages (from-to)	2276-2283
Number of pages	8
Journal	Astronomical Journal
Volume	114
Issue number	6
DOIs	https://doi.org/10.1086/118647
State	Published - Dec 1997

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/118647

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title = "The external shear acting on gravitational lens B1422+231",

abstract = "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 B1422+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 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, 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.",

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T1 - The external shear acting on gravitational lens B1422+231

AU - Kundić, Tomislav

AU - Hogg, David W.

AU - Blandford, Roger D.

AU - Cohen, Judith G.

AU - Lubin, Lori M.

AU - Larkin, James E.

PY - 1997/12

Y1 - 1997/12

N2 - 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 B1422+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 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, 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.

AB - 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 B1422+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 35h-1 kpc and its velocity dispersion is ∼550 km s-1. A straightforward application of the virial theorem yields a group mass of 1.4× 1013h-1M⊙, 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.

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The external shear acting on gravitational lens B1422+231

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