An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745

Abstract

We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October 1998 and December 2000, are the first from a long-term project aimed at monitoring selected lensed quasars in the Southern Hemisphere. A time delay of 103+/-12 days is determined from the light curves. In addition, VLT/FORS1 spectra of HE2149-2745 are deconvolved in order to obtain the spectrum of the faint lensing galaxy, free of any contamination by the bright nearby two quasar images. By cross-correlating the spectrum with galaxy-templates we obtain a tentative redshift estimate of z=0.495+/-0.01. Adopting this redshift, a Omega=0.3, Lambda=0.7 cosmology, and a chosen analytical lens model, our time-delay measurement yields a Hubble constant of H_0=66+/-8 km/s/Mpc with an estimated systematic error of +/-3 km/s/Mpc. Using non-parametric models yields H_0=65+/-8 km/s/Mpc and confirms that the lens exhibits a very dense/concentrated mass profile.

11 pages, accepted for publication in Astronomy & Astrophysics

Cited by in corpus (73)

• H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview
• Time Delay Cosmography
• What Do Gravitational Lens Time Delays Measure?
• The Time Delays of Gravitational Lens HE0435-1223: An Early-Type Galaxy With a Rising Rotation Curve
• Gravitational Lens Time Delays: A Statistical Assessment of Lens Model Dependences and Implications for the Global Hubble Constant
• Size is Everything: Universal Features of Quasar Microlensing with Extended Sources
• A Determination of H_0 with the CLASS Gravitational Lens B1608+656: III. A Significant Improvement in the Precision of the Time Delay Measurements
• Self-Similar Models for the Mass Profiles of Early-type Lens Galaxies
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231
• First catalog of strong lens candidates in the COSMOS field
• Microlensing of the broad line region in 17 lensed quasars
• The redshift distribution of gravitational lenses revisited: Constraints on galaxy mass evolution
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223
• A Spectroscopic Study of the Environments of Gravitational Lens Galaxies
• The Importance of Lens Galaxy Environments
• A portable modeler of lensed quasars
• The Hubble Constant
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses I. How to sample the light curves of gravitationally lensed quasars to measure accurate time delays
• COSMOGRAIL XIX: Time delays in 18 strongly lensed quasars from 15 years of optical monitoring
• The Hubble time inferred from 10 time-delay lenses
• SDSS J1254+0846: A Binary Quasar Caught in the Act of Merging
• Testing the dark energy with gravitational lensing statistics
• The Hubble constant from gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VII. Time delays and the Hubble constant from WFI J2033-4723
• Improved Constraints on the Gravitational Lens Q0957+561. II. Strong Lensing
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VI. Redshift of the lensing galaxy in seven gravitationally lensed quasars
• Microlensing variability in the gravitationally lensed quasar Q2237+0305 = the Einstein Cross, I. Spectrophotometric monitoring with the VLT
• An optical time delay for the double gravitational lens system FBQ 0951+2635
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914
• First Results from a Photometric Survey of Strong Gravitational Lens Environments
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses V. The time delay in SDSS J1650+4251
• Cosmography from two-image lens systems: overcoming the lens profile slope degeneracy
• Strong Lens Time Delay Challenge: I. Experimental Design
• The Hubble constant inferred from 18 time-delay lenses
• How robust are the constraints on cosmology and galaxy evolution from the lens-redshift test?
• $H_0$ from ten well-measured time delay lenses
• Gravitational Lens Time Delays in CDM
• Observations of radio-quiet quasars at 10mas resolution by use of gravitational lensing
• Origin of Chromatic Features in Multiple Quasars -Variability, Dust, or Microlensing -
• Cosmological distance indicators
• Cosmic alignment towards the radio Einstein ring PKS 1830-211 ?
• Time delays for 11 gravitationally lensed quasars revisited
• Microlensing variability in time-delay quasars
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• Lens-Aided Multi-Angle Spectroscopy (LAMAS) Reveals Small-Scale Outflow Structure in Quasars
• A search for clusters and groups of galaxies on the line of sight towards 8 lensed quasars
• Redshift of the Einstein Ring in MG1549+305
• Microlensing and Intrinsic Variability of the Broad Emission Lines of Lensed Quasars
• Time delay of SBS 0909+532
• A Comparison of Cosmological Models Using Time Delay Lenses
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• First robotic monitoring of a lensed quasar: intrinsic variability of SBS 0909+532
• Near-Infrared K and L' Flux Ratios in Six Lensed Quasars
• Microlensing of the broad emission lines in 27 gravitationally lensed quasars. Broad line region structure and kinematics
• A simple analysis of halo density profiles using gravitational lensing time delays
• VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 microJy radio source
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses IV. Models of prospective time-delay lenses
• A 4% measurement of $H_0$ using the cumulative distribution of strong-lensing time delays in doubly-imaged quasars
• Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: Implications for $H_0$
• Identifying Anomalies in Gravitational Lens Time Delays
• Cosmological test using strong gravitational lensing systems
• Measuring time delays: II. Using observations of the unresolved flux and astrometry
• Lens or Binary? Chandra Observations of the Wide Separation Broad Absorption Line Quasar Pair UM425
• Time-delay quasars: scales and orders of magnitudes
• Photometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing
• Bayesian approach to gravitational lens model selection: constraining H_0 with a selected sample of strong lenses
• Strongly Lensed Jets, Time Delays, and the Value of H0
• Hubble Constant, Lensing, and Time Delay in Relativistic MOND
• TDCOSMO XVII. New time delays in 22 lensed quasars from optical monitoring with the ESO-VST 2.6m and MPG 2.2m telescopes
• Discovery of a Galaxy Cluster in the Foreground of the Wide-Separation Quasar Pair UM425
• Improving the light curves of gravitationally lensed quasars with Gaia proper motion data
• Model selection using time-delay lenses