Статья

An optical time delay for the double gravitational lens system FBQ 0951+2635

P. JakobssonNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark e-mail: [email protected]J. HjorthNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark e-mail: [email protected]I. BurudSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAG. LetaweInstitut d'Astrophysique et de Géophysique, ULg, Allée du 6 Août 17, B5C, 4000 Sart Tilman (Liège), BelgiumC. LidmanEuropean Southern Observatory, Casilla 19, Santiago, ChileF. CourbinLaboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne, Observatoire, 1290 Chavannes-des-bois, Switzerland

2005en

ABI

Аннотация

We present optical R-band light curves of the double gravitationally lensed quasar FBQ 0951+2635 from observations obtained at the Nordic Optical Telescope between March 1999 and June 2001. A time delay of ± 2 days (1σ) is determined from the light curves. New constraints on the lensing geometry are provided by the position and ellipticity of the lensing galaxy. For a cosmology, the time delay yields a Hubble parameter of (random, ) (systematic) km s-1 Mpc-1 for a singular isothermal ellipsoid model and (random, ) (systematic) km s-1 Mpc-1 for a constant mass-to-light ratio model. In both models, the errors are mainly due to the time-delay uncertainties. Non-parametric models yield (random, ) (systematic) km s-1 Mpc-1.

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Идентификаторы

DOI: 10.1051/0004-6361:20041432

Цитирования и источники

Цитирований: 3Использованных источников: 0

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