Chandra Observations of Gravitational Lenses B1600+434 and B1608+656

Abstract

We observed B1600+434 and B1608+656 with CXO/ACIS, detecting both quasar images in B1600+434 and three of four images in B1608+656. We did not detect significant X-ray emission from nearby galaxy groups or clusters associated with each lens galaxy. The upper limits on the X-ray luminosity of any cluster within 4 arcmin of each lens and at each lens redshift are of ~2\times10^{42} and ~6\times10^{42} erg/s for B1600+434 and B1608+656, respectively. The radio-loud source quasars have power-law photon indices of Γ=1.9\pm0.2 and Γ=1.4\pm0.3 and X-ray luminosities of 1.4^{+0.2}_{-0.1}\times10^{45} and 2.9^{+0.7}_{-0.4}\times10^{44} erg/s for B1600+434 and B1608+656, respectively before correcting for the magnification. We detected a differential absorption column density of ΔN_H ~ 3\times10^{21} cm^{-2} between the two images of B1600+434, roughly consistent with expectations from differential extinction estimates of ΔE(B-V)=0.1 mag and a standard dust-to-gas ratio. The differential absorption observed in gravitational lenses may serve as an important probe to study the gas content in high redshift galaxies since it can separate the absorbing column originating from the lens galaxy and those intrinsic to quasars. We also detected 157 serendipitous X-ray sources in the two Chandra fields and identified the brighter optical counterparts using the SDSS and DPOSS surveys.

arXiv comment24 pages, including 3 figures and 5 tables, accepted by ApJ

References in corpus (37)

• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• The Third Data Release of the Sloan Digital Sky Survey
• Statistics: Handle with Care, Detecting Multiple Model Components with the Likelihood Ratio Test
• A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
• The GEMS project: X-ray analysis and statistical properties of the group sample
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• Dust and Extinction Curves in Galaxies with z>0: The Interstellar Medium of Gravitational Lens Galaxies
• The Lx-T, Lx-sigma and sigma-T relations for groups and clusters of galaxies
• X-ray Spectroscopy of QSOs with Broad Ultraviolet Absorption Lines
• What Do Gravitational Lens Time Delays Measure?
• Velocity Dispersions and X-Ray Temperatures of Galaxy Clusters
• A Determination of H_0 with the CLASS Gravitational Lens B1608+656: III. A Significant Improvement in the Precision of the Time Delay Measurements
• The Hubble Constant from the Gravitational Lens B1608+656
• The Importance of Einstein Rings
• Clusters of galaxies in the local universe
• The Importance of Lens Galaxy Environments
• A Determination of H_0 with the CLASS Gravitational Lens B1608+656: I. Time Delay Measurements with the VLA
• 2-8 keV X-ray number counts determined from Chandra blank field observations
• A determination of H_0 with the CLASS gravitational lens B1608+656: II. Mass models and the Hubble constant from lensing
• Chandra Observations of QSO 2237+0305
• Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events
• An optical time-delay estimate for the double gravitational lens system B1600+434
• The LX-sigma Relation for Galaxies and Clusters of Galaxies
• Are X-ray properties of loose groups different from those of compact groups?
• Keck Spectroscopy of Three Gravitational Lens Systems Discovered in the JVAS and CLASS Surveys
• Caught in the Act; Chandra Observations of Microlensing of the Radio-Loud Quasar MG J0414+0534
• The Gravitational Lens -- Galaxy Group Connection: I. Discovery of a Group Coincident with CLASS B0712+472
• A Study of QSO Evolution in the X-Ray Band with the Aid of Gravitational Lensing
• Chandra Observations of the Cloverleaf Quasar H 1413+117: A Unique Laboratory for Microlensing Studies of a Lobal Quasar
• Gravitational Lens Time Delays in CDM
• Chandra Detects a Rapid Flare in the Gravitationally Lensed Mini-BALQSO RX J0911.4+0551
• Constraining H0 from Chandra Observations of Q0957+561
• Results from the CASTLES Survey of Gravitational Lenses
• Chandra X-ray Observations of the Quadruply Lensed Quasar RX J0911.4+0551
• Detection of x-rays from galaxy groups associated with the gravitationally lensed systems PG 1115+080 and B1422+231
• Is B1422+231 a Golden Lens?
• The Gravitational Lens B1608+656: I. V, I, and H-band HST Imaging

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• Probing The Dust-To-Gas Ratio of z > 0 Galaxies Through Gravitational Lenses
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• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses
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