Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-11
Astrophys.J. 544 (2000) 117-122
Astronomy and Astrophysics
Astrophysics
15 pages, 4 figures, accepted for publication in ApJ
Scientific paper
10.1086/317213
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and November 1999. The photometry has been performed by simultaneous deconvolution of all the data frames, involving a numerical lens galaxy model. Four methods have been applied to determine the time delay between the two QSO components, giving a mean estimate of \Delta_t = 51+/-4 days (95% confidence level). This is the fourth optical time delay ever measured. Adopting a Omega=0.3, Lambda=0 Universe and using the mass model of Maller et al. (2000), this time-delay estimate yields a Hubble parameter of H_0=52 (+14, -8) km s^-1 Mpc^-1 (95% confidence level) where the errors include time-delay as well as model uncertainties. There are time-dependent offsets between the two (appropriately shifted) light curves that indicate the presence of external variations due to microlensing.
Andersen Michael I.
Burud Ingunn
Clasen Jacob W.
Hjorth Jens
Jaunsen Andreas O.
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