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

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dc.creatorJakobsson, P.
dc.creatorHjorth, J.
dc.creatorBurud, I.
dc.creatorLetawe, G.
dc.creatorLidman, C.
dc.creatorCourbin, F.
dc.date2004-09-17
dc.date.accessioned2026-07-07T02:14:40Z
dc.date.available2026-07-07T02:14:40Z
dc.descriptionWe 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 16 +/- 2 days (1 sigma) 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 (Omega_m, Omega_Lambda) = (0.3, 0.7) cosmology, the time delay yields a Hubble parameter of H_0 = 60^{+9}_{-7} (random, 1 sigma) +/- 2 (systematic) km/s/Mpc for a singular isothermal ellipsoid model and H_0 = 63^{+9}_{-7} (random, 1 sigma) +/- 1 (systematic) km/s/Mpc 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 H_0 = 64^{+9}_{-7} (random, 1 sigma) +/- 14 (systematic) km/s/Mpc.
dc.description7 pages, 7 figures. Accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0409444
dc.identifierhttp://arxiv.org/abs/astro-ph/0409444
dc.identifierAstron.Astrophys. 431 (2005) 103-109
dc.identifierdoi:10.1051/0004-6361:20041432
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8203
dc.subjectAstrophysics
dc.titleAn optical time delay for the double gravitational lens system FBQ 0951+2635
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