Article (Scientific journals)
Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530
Burud, I.; Hjorth, J.; Courbin, F. et al.
2002In Astronomy and Astrophysics, 391, p. 481-486
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Keywords :
gravitational lensing; quasars: individual: SBS 1520+530; cosmology: cosmological parameters
Abstract :
[en] We present optical R-band light curves of the gravitationally lensed quasar <ASTROBJ>SBS 1520+530</ASTROBJ> derived from data obtained at the Nordic Optical Telescope. A time delay of 130+/-3 days (1sigma ) is determined from the light curves. In addition, spectra of <ASTROBJ>SBS 1520+530</ASTROBJ> 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 Omega =0.3, Lambda =0.7 cosmology, our time-delay measurement yields a Hubble constant of H[SUB]0[/SUB]=51 +/- 9 km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP] (1sigma error). Based on observations made with the Nordic Optical, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias and the W. M. Keck Observatory which is operated jointly by the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/391/481
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Burud, I.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Hjorth, J.;  Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
Courbin, F.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, Bat. B5C, Liège 1, Belgium ; Universidad Católica de Chile, Departamento de Astronomia y Astrofisica, Casilla 306, Santiago 22, Chile
Cohen, J. G.;  California Institute of Technology, Pasadena, CA 91125, USA
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Jaunsen, A. O.;  European Sourthern Observatory, Casilla 19, Santiago, Chile
Kaas, A. A.;  Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Canary Islands, Spain
Faure, C.;  European Sourthern Observatory, Casilla 19, Santiago, Chile ; Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400 Toulouse, France
Letawe, Géraldine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530
Publication date :
01 August 2002
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
391
Pages :
481-486
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 December 2009

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