The optical time delay in the double quasar Q 0957+561 A, B.

Details The optical time delay in the double quasar Q 0957+561 A, B. The optical time delay in the double quasar Q 0957+561 A, B.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..341b&link_type=abstract

Astronomy and Astrophysics, v.304, p.341

Astronomy and Astrophysics

Astrophysics

10

Gravitational Lensing, Quasars: Q 0957+561 A, B, Methods: Statistical

Scientific paper

We propose a method for estimation of the time delay between identical time samples with unequidistant data. We carried out an analysis of two published optical data sets (Vanderriest et al. 1989; Schild 1990) of Q 0957+561 A, B, the first gravitational lens. It is determined that the time delay between the arrival of wave fronts from the images A and B is 1.45+0.04yr. Using Monte-Carlo simulations, we compare reliability of time delay determination methods and define the confidence probability of our result better than 99%. The problem of microlensing effects is briefly discussed.

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