Redshifts and lens profile for the double quasar QJ 0158-4325

Abstract

We report on the redshift of the lensing galaxy and of the quasar QJ 0158-4325 and on the lens model of the system. A deep VLT/FORS2 spectrum and HST/NICMOS-F160W images are deconvolved. From the images we derive the light profile of the lensing galaxy and an accurate relative astrometry for the system. In addition we measure the flux ratio between the quasar images in the MgII emission line to constrain the mass model. From the spectrum we measure the redshift of the lensing galaxy (z=0.317+/-0.001) and of the quasar (z=1.294+/-0.008). Using the flux ratio in the lens model allows to discard the SIE as a suitable approximation of the lens potential. On the contrary the truncated-PIEMD gives a good fit to the lens and leads to a time delay of t(A-B)=-14.5+/-0.1 days, with H0=73 km/s/Mpc. Using the flux ratio to constrain the mass model favors the truncated-PIEMD over the SIE, while ignoring this constraint leaves the choice open.

arXiv commentResearch Note, Accepted for publication in A&A

References in corpus (15)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• A Bayesian approach to strong lensing modelling of galaxy clusters
• Deconvolution with correct sampling
• The Evolution of a Mass-Selected Sample of Early-Type Field Galaxies
• Variability of Active Galactic Nuclei
• The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
• Microlensing variability in the gravitationally lensed quasar Q2237+0305 = the Einstein Cross, I. Spectrophotometric monitoring with the VLT
• The CASTLES project
• Simultaneous Estimation of Time Delays and Quasar Structure
• A deconvolution-based algorithm for crowded field photometry with unknown Point Spread Function
• A search for clusters and groups of galaxies on the line of sight towards 8 lensed quasars
• Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
• Deconvolution of HST images of the Cloverleaf gravitational lens : detection of the lensing galaxy and a partial Einstein ring
• Mass Follows Light

Cited by in corpus (15)

• The Microlensing Properties of a Sample of 87 Lensed Quasars
• COSMOGRAIL XIX: Time delays in 18 strongly lensed quasars from 15 years of optical monitoring
• X-ray Monitoring of Gravitational Lenses With Chandra
• Measuring the Innermost Stable Circular Orbits of Supermassive Black Holes
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• COSMOS 5921+0638: Characterization and analysis of a new strong gravitationally lensed AGN
• Confirmation of Planet-Mass Objects in Extragalactic Systems
• Photometric Classification of quasars from RCS-2 using Random Forest
• Constraining quasar structure using high-frequency microlensing variations and continuum reverberation
• Evidence for a milliparsec-separation Supermassive Binary Black Hole with quasar microlensing
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: Implications for $H_0$
• The Effect of Microlensing On the Observed X-ray Energy Spectra of Gravitationally Lensed Quasars
• Time Evolution of Mg II in SDSS J2320+0024: Implications for a Subparsec Binary Supermassive Black Hole System
• An equal mass ratio supermassive binary black holes in Q J0158-4325 with periodic microlensing signature?
• New Dynamical Measurements from a Lensed Quasar Sample: Joint Analysis Constrains the Mass Profile Evolution of Lens Galaxies