Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492...74g&link_type=abstract
Astrophysical Journal v.492, p.74
Astronomy and Astrophysics
Astronomy
11
Cosmology: Gravitational Lensing, Galaxies: Quasars: Individual Alphanumeric: 0957+561
Scientific paper
The lag associated with the main peak of the cross-correlation function of the two light curves arriving from a double-imaged quasar is usually identified with the time delay between the components. However, short-timescale microlensing events can independently modify the light curve of each component, and when strong microlensing is present, the features of the cross-correlation function depend on both amplitude and shape of the microlensing events. This fact prevents a direct interpretation of the lag associated with the main peak as the true time delay. We present a new analysis of the light curves cross-correlation function including short-timescale microlensing. We discuss its application to the 1995/1996 optical photometry of Q0957+561, and determine the trend of a possible microlensing event taking place from JD 2,450,150 to 2,450,200.
Buitrago Jesus
Goicoechea Luis Julian
Mediavilla Evencio
Oscoz Alejandro
Serra-Ricart Miquel
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