The External Shear Acting on Gravitational Lens B 1422+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 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.

16 pages including 3 tables, 2 eps figures and 2 jpeg images. Submitted to the Astronomical Journal

Cited by in corpus (64)

• Evidence for substructure in lens galaxies?
• Massive Dark-matter halos and Evolution of Early-type Galaxies to z=1
• The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up
• X-ray Properties of Groups of Galaxies
• The Optical Properties of Gravitational Lens Galaxies as a Probe of Galaxy Structure and Evolution
• The Enrichment History of the Intergalactic Medium: Measuring the CIV/HI Ratio in the Lyman Alpha Forest
• A Determination of H_0 with the CLASS Gravitational Lens B1608+656: III. A Significant Improvement in the Precision of the Time Delay Measurements
• Detection of substructure with adaptive optics integral field spectroscopy of the gravitational lens B1422+231
• Redshifts of the Gravitational Lenses B1422+231 and PG1115+080
• B1422+231: The influence of mass substructure on strong lensing
• A Spectroscopic Study of the Environments of Gravitational Lens Galaxies
• Analytic Cross Sections for Substructure Lensing
• Small Scale Structure at High Redshift: II. Physical Properties of the CIV Absorbing Clouds
• The Importance of Lens Galaxy Environments
• A New Hybrid Framework to Efficiently Model Lines of Sight to Gravitational Lenses
• B2045+265: A New Four-Image Gravitational Lens from CLASS
• Subaru Mid-infrared Imaging of the Quadruple Lenses PG1115+080 and B1422+231: Limits on Substructure Lensing
• COSMOGRAIL XIX: Time delays in 18 strongly lensed quasars from 15 years of optical monitoring
• Fitting Gravitational Lenses: Truth or Delusion
• Redshifts of the Gravitational Lenses MG0414+0534 and MG0751+2716
• The Effect of Environment on Shear in Strong Gravitational Lenses
• The Hubble constant from gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys
• Extinction Curves of Lensing Galaxies out to z=1
• Lensing Optical Depth for Substructure and Isolated Dark Matter Halos
• The Gravitational Lens -- Galaxy Group Connection: I. Discovery of a Group Coincident with CLASS B0712+472
• VLBA images of High Frequency Peakers
• Qualitative Theory for Lensed QSOs
• RX J0911+05: A Massive Cluster Lens at z=0.769
• First Results from a Photometric Survey of Strong Gravitational Lens Environments
• Galaxy Number Counts and Implications for Strong Lensing
• A Keck Survey of Gravitational Lens Systems: I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051
• SDSS J0903+5028: A New Gravitational Lens
• Small Scale Structure at High Redshift: III. The Clumpiness of the Intergalactic Medium on Sub-kpc Scales
• What Fraction of Gravitational Lens Galaxies Lie in Groups?
• Determination of time delay from the gravitational lens B1422+231
• Effects of Ellipticity and Shear on Gravitational Lens Statistics
• Multipole Models of Four-Image Gravitational Lenses with Anomalous Flux Ratios
• A Strong-Lens Survey in AEGIS: the influence of large scale structure
• The Gravitational Lens -- Galaxy Group Connection. II. Groups Associated with B2319+051 and B1600+434
• Milliarcsec-scale polarisation observations of the gravitational lens B1422+231
• The impact of lens galaxy environments on the image separation distribution
• Gravitational Lenses With More Than Four Images: I. Classification of Caustics
• SDSS J1650+4251: A New Gravitational Lens
• Constraints on warm dark matter from weak lensing in anomalous quadruple lenses
• Strong lensing statistics in large, z~<0.2 surveys: bias in the lens galaxy population
• Discs in early-type lensing galaxies: effects on magnification ratios and measurements of $H_0$
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• An analytic model for non-spherical lenses in covariant MOdified Newtonian Dynamics
• Weak Lensing by Line-of-sight Halos as the Origin of Flux-ratio Anomalies in Quadruply Lensed QSOs
• The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses
• Gravitational lensing magnification without multiple imaging
• Detection of x-rays from galaxy groups associated with the gravitationally lensed systems PG 1115+080 and B1422+231
• Probing the mass distribution in groups of galaxies using gravitational lensing
• MgII Absorption at 2 < z < 6 with Magellan / FIRE. II: A Longitudinal Study of HI, Metals, and Ionization in Galactic Haloes
• Is B1422+231 a Golden Lens?
• High-redshift quasars along the Main Sequence
• Weak Lensing by Intergalactic Mini-Structures in Quadruple Lens Systems: Simulation and Detection
• Strong gravitational lensing by multiple galaxies
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: Implications for $H_0$
• Galaxy-lens determination of $H_0$: the effect of the ellipse+shear modeling assumption
• New Near-Infrared Spectroscopy of the High Redshift Quasar B 1422+231 at z=3.62
• A VLA monitoring study of JVAS B1422+231: investigation of time delays and detection of extrinsic variability
• A New Window of Exploration in the Mass Spectrum: Strong Lensing by Galaxy Groups in the SL2S
• Type-Ia Supernova Remnant Shell At $Z=3.5$ Seen In The Three Sightlines Toward The Gravitationally Lensed Qso B1422+231