Determination of difference in light travel time for QSO 0957 + 561A, B

Details Determination of difference in light travel time for QSO 0957 + 561A, B Determination of difference in light travel time for QSO 0957 + 561A, B

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138l..19f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. L19, L20.

Astronomy and Astrophysics

Astrophysics

32

Cosmology, Gravitational Lenses, Light Transmission, Quasars, Astronomical Photometry, Time Lag

Scientific paper

The time delay, Delta-t, between light variations in two images of the
QSO 0957 + 561 has been observationally established at 1.55 + or - 0.1
years, for which the most probable Hubble parameter value is 77 km/sec
per Mpc. The brightening of the B image, which is currently taking
place, is physically the same as that of the A image in 1982.

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