The radio time delay in the double quasar 0957 + 561

Details The radio time delay in the double quasar 0957 + 561 The radio time delay in the double quasar 0957 + 561

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..453l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 10, 1992, p. 453-466. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

60

Gravitational Lenses, Quasars, Time Lag, Very Large Array (Vla), Wave Fronts, Astronomical Models, Monte Carlo Method, Radiant Flux Density, Radio Astronomy

Scientific paper

Gravitational lens models for the double quasar 0957 + 561 predict that there should be a time delay of roughly 1 year between the arrival of wave fronts from the two images. In order to measure this delay, the flux densities at lambda = 6 cm of 0957 + 561 A and 0957 + 561 B have been monitored since 1979. The flux curves of the two images constructed from the VLA data are presented which are accurate to 2 percent of the image flux densities. The VLA data are best fitted by a time delay of 1.40 +/-0.1 yr (513 +/-40 days, A leading), with a magnification ratio (B/A) of 0.697 +/-0.003. The error estimates were obtained through Monte Carlo methods, and include 68 percent of the simulated solutions.

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