Статья

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

I. BurudSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAJ. HjorthAstronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, DenmarkF. CourbinInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, Bat. B5C, Liège 1, BelgiumJudith G. CohenCalifornia Institute of Technology, Pasadena, CA 91125, USAP. MagainInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, Bat. B5C, Liège 1, BelgiumA. O. JaunsenEuropean Sourthern Observatory, Casilla 19, Santiago, ChileA. A. KaasNordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Canary Islands, SpainC. FauréEuropean Sourthern Observatory, Casilla 19, Santiago, ChileG. LetaweInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août, Bat. B5C, Liège 1, Belgium

2002en

ABI

Аннотация

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 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 , 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 , cosmology, our time-delay measurement yields a Hubble constant of (1σ error).

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Идентификаторы

DOI: 10.1051/0004-6361:20020856

Цитирования и источники

Цитирований: 3Использованных источников: 0

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