Reference : An optical time delay for the double gravitational lens system FBQ 0951+2635
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/32174
An optical time delay for the double gravitational lens system FBQ 0951+2635
English
Jakobsson, P. [> > > >]
Hjorth, J. [> > > >]
Burud, I. [> > > >]
Letawe, Géraldine mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Lidman, C. [> > > >]
Courbin, F. [> > > >]
Feb-2005
Astronomy and Astrophysics
E D P Sciences
431
1
103-109
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis Cedex A
[en] gravitational lensing ; galaxies : quasars : individual : FBQ 0951+2635 ; cosmology : cosmological parameters
[en] 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 Deltatau = 16 +/- 2 days (1sigma) 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(-7)(+9) (random, 1sigma) +/-2 (systematic) km s(-1) Mpc(-1) for a singular isothermal ellipsoid model and H-0 = 63(-7)(+9) (random, 1sigma) +/-1 (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 H-0 = 64(-7)(+9) (random, 1sigma) +/- 14 (systematic) km s(-1) Mpc(-1).
Researchers
http://hdl.handle.net/2268/32174
10.1051/0004-6361:20041432

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