The value of the time delay Delta t(A, B) for the 'double' quasar 0957+561 from optical photometric monitoring

Details The value of the time delay Delta t(A, B) for the 'double' quasar 0957+561 from optical photometric monitoring The value of the time delay Delta t(A, B) for the 'double' quasar 0957+561 from optical photometric monitoring

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215....1v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 1-13.

Astronomy and Astrophysics

Astrophysics

105

Astronomical Photometry, Gravitational Lenses, Image Processing, Quasars, Time Lag, Astrometry, Brightness, Hubble Constant, Light Curve, Very Long Base Interferometry

Scientific paper

The time delay between images A and B of the supposed gravitational-lens double quasar 0957+561 is determined on the basis of an extensive photometric monitoring campaign covering the period 1980-1987. Electronographic, photographic, and photoelectric observations in the B band, obtained at the Observatoire de Haute Provence, the Canada-France-Hawaii telescope, and Calar Alto, are combined with published CCD data (Schild, 1986) in extensive tables and graphs and analyzed. A travel-time delay of 415 + or - 20 days is calculated and shown to be consistent with the gravitational-mirage hypothesis. Small slow variations in the true interimage brightness ratio at a given emission time are also detected, and the ratio is found to be different from that of the extended features seen in radio VLBI observations; a possible microlensing effect is inferred.

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