Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..698f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 15, 1991, p. 698-706.
Astronomy and Astrophysics
Astronomy
19
Gravitational Lenses, Quasars, Stellar Gravitation, Imaging Techniques, Light Curve, Time Lag
Scientific paper
A study is presented of the effects of individual stars in the gravitational lens that forms the images A and B of the QSO Q0957 + 561. The main result is evidence that it is very unlikely that microlensing effects dominate the observed fluctuations of the images. Therefore, the measured (but uncertain) correlation between the light curves of the images is likely due to intrinsic luminosity variations at the source, rather than to propagation effects at the lens. It is found, however, that the disagreement between magnification estimates at optical and radio wavelengths is a strong indicator of microlensing. Thus, estimates for the time delay for A and B, Delta tau(AB), should be obtained for spectral bands that are least affected by microlensing, i.e., the largest emission regions in the QSO. However, recent estimates for Delta tau(AB) are different for the two available optical data sets, and they depend strongly on the method used to cross-correlate the light curves. From simulated model data, a reliable method for cross-correlation in the present situation is singled out. In addition, a method is proposed that yields simultaneous estimates for the time delay for an image pair and for their magnification ratio at optical wavelengths.
Falco Emilio E.
Schneider Pat
Wambsganss Joachim
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