Detection of x-rays from galaxy groups associated with the gravitationally lensed systems PG 1115+080 and B1422+231

Abstract

Gravitational lenses that produce multiple images of background quasars can be an invaluable cosmological tool. Deriving cosmological parameters, however, 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 group associated with the lensing system PG 1115+080 and the first X-ray image of the group associated with the system B1422+231. We find a temperature and rest-frame luminosity of 0.8 +/- 0.1 keV and 7 +/- 2 x 10^{42} ergs/s for PG 1115+080 and 1.0 +infty/-0.3 keV and 8 +/- 3 x 10^{42} ergs/s for B1422+231. 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.

Accepted for publication in ApJ. 17 pages, 5 figures. Minor changes to text

References in corpus (9)

• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• Physical Implications of the X-ray Properties of Galaxy Groups and Clusters
• The effect of non--gravitational gas heating in groups and clusters of galaxies
• The LX-sigma Relation for Galaxies and Clusters of Galaxies
• The Gravitational Lens -- Galaxy Group Connection: I. Discovery of a Group Coincident with CLASS B0712+472
• Determination of time delay from the gravitational lens B1422+231
• Is B1422+231 a Golden Lens?
• The detection and X-ray evolution of galaxy groups at high redshift

Cited by in corpus (16)

• The CFHTLS Strong Lensing Legacy Survey: I. Survey overview and T0002 release sample
• How well can cold-dark-matter substructures account for the observed radio flux-ratio anomalies?
• A Spectroscopic Study of the Environments of Gravitational Lens Galaxies
• On the Effects of Line-of-Sight Structures on Lensing Flux-ratio Anomalies in a LCDM Universe
• First Results from a Photometric Survey of Strong Gravitational Lens Environments
• A Strong X-Ray Flux Ratio Anomaly in the Quadruply Lensed Quasar PG 1115+080
• X-ray Selected Intermediate-Redshift Groups of Galaxies
• The Gravitational Lens -- Galaxy Group Connection. II. Groups Associated with B2319+051 and B1600+434
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• Resolving the baryon-fraction profile in lensing galaxies
• Exploratory Study of the X-Ray Properties of Quasars With Intrinsic Narrow Absorption Lines
• Light versus dark in strong-lens galaxies: Dark matter haloes that are rounder than their stars
• The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses
• Chandra Observations of Gravitational Lenses B1600+434 and B1608+656
• Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra
• Host group degeneracy in gravitational lensing time delay determination of $H_0$