Time Delay of QSO 0957+561 and Cosmological Implications

Details Time Delay of QSO 0957+561 and Cosmological Implications Time Delay of QSO 0957+561 and Cosmological Implications

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...479l..89o&link_type=abstract

Astrophysical Journal Letters v.479, p.L89

Astronomy and Astrophysics

Astronomy

29

Cosmology: Gravitational Lensing, Galaxies: Quasars: Individual Alphanumeric: 0957+561

Scientific paper

We obtain the time delay between the arrival time of the A and B images of the QSO 0957+561. The results of applying two different methods (the discrete cross-correlation function and the dispersion estimation technique) to the observed light curves of the A and B images are presented. The adopted value (time delay) is of Delta tau BA = 424 +/- 3 days (1 sigma ). We have used this time delay as well as a recent measurement of the one-dimensional velocity dispersion of the main lensing galaxy ( sigma gal) to estimate H0. Two H0 = H0( Delta tau BA, sigma gal) relations based on different pictures of the lens galaxy, lead to H0 = 64 ^{+14}_{-15} km s-1 Mpc-1 (2 sigma ) (softened power-law sphere) and H0 = 66 ^{+15}_{-14} km s-1 Mpc-1 (2 sigma ) (King profile plus a point-mass at the center).

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