Article (Scientific journals)
An optical time delay for the double gravitational lens system FBQ 0951+2635
Jakobsson, P.; Hjorth, J.; Burud, I. et al.
2005In Astronomy and Astrophysics, 431 (1), p. 103-109
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Keywords :
gravitational lensing; galaxies : quasars : individual : FBQ 0951+2635; cosmology : cosmological parameters
Abstract :
[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).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Jakobsson, P.
Hjorth, J.
Burud, I.
Letawe, Géraldine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Lidman, C.
Courbin, F.
Language :
English
Title :
An optical time delay for the double gravitational lens system FBQ 0951+2635
Publication date :
February 2005
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
E D P Sciences, Les Ulis Cedex A, France
Volume :
431
Issue :
1
Pages :
103-109
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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