CaltechAUTHORS
Published August 2, 2002 | Version Published + Accepted Version
Journal Article Open

Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530

Creators

  • 1. ROR icon Space Telescope Science Institute
  • 2. ROR icon University of Copenhagen
  • 3. ROR icon University of Liège
  • 4. ROR icon Pontificia Universidad Católica de Chile
  • 5. ROR icon California Institute of Technology
  • 6. ROR icon Nordic Optical Telescope
  • 7. ROR icon Observatoire Midi-Pyrénées

Abstract

We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130 ± 3 days (1σ) is determined from the light curves. In addition, spectra of SBS 1520+530 obtained at the Keck Observatory are spatially deconvolved in order to extract the spectrum of the faint lensing galaxy, free of any contamination by the light from the bright quasar images. This spectrum indicates a lens redshift z = 0.717, in agreement with one of the absorption systems found in the quasar spectra. The best mass model of the system includes a second nearby galaxy and a cluster of galaxies in addition to the main lensing galaxy. Adopting this model and an Ω = 0.3, Λ = 0.7 cosmology, our time-delay measurement yields a Hubble constant of H_0 = 51 ± 9 km s^(-1) Mpc^(-1) (1σ error).

Additional Information

© 2002 ESO. Received: 23 April 2002. Accepted: 4 June 2002. We thank the NOT Director Vilppu Piirola for granting us observing time for this project on a flexible basis. We are especially grateful to the many visiting observers at NOT who have contributed to this project by performing the scheduled observations. This project was conceived in 1997 while JH and AOJ were visiting scientists at the Center for Advanced Study in Oslo. We thank Rolf Stabell and Sjur Refsdal for inviting us in their center and for their kind hospitality. JH appreciates the hospitality of the OMP where some of this work was conducted. The project was supported by the Danish Natural Science Research Council (SNF). IB was supported in part by contract ARC94/99-178 "Action de Recherche Concertée de la Communauté Française (Belgium)'' and Pôle d'Attraction Interuniversitaire, P4/05 (SSTC, Belgium). FC acknowledges financial support through Chilean grant FONDECYT/3990024 and through Marie Curie grant MCFI-2001-0242. Additional support from the European Southern Observatory and ECOS/CONICYT CU00U05 grant is also gratefully acknowledged.

Attached Files

Published - aa2609.pdf

Accepted Version - 0206084.pdf

Files

0206084.pdf

Files (979.1 kB)

Name Size
md5:d1a20700b71048a2eb1982b280dca815
702.9 kB Preview Download
md5:de3d915e5b47c672e44ddde1385c3102
276.2 kB Preview Download

Additional details

Identifiers

Eprint ID
84714
Resolver ID
CaltechAUTHORS:20180207-101035264

Related works

Describes
https://arxiv.org/abs/astro-ph/0206084 (URL)

Funding

Danish Natural Science Research Council
Communauté française de Belgique - Actions de recherche concertée
ARC94/99-178
Pôle d'Attraction Interuniversitaire P4/05 (Belgium)
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
3990024
Marie Curie Fellowship
MCFI-2001-0242
European Southern Observatory
ECOS/CONICYT
CU00U05
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)

Dates

Created
2018-02-08
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field