The time delay in the twin QSO Q0957 + 561

Details The time delay in the twin QSO Q0957 + 561 The time delay in the twin QSO Q0957 + 561

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1771s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1771-1776.

Astronomy and Astrophysics

Astronomy

57

Gravitational Lenses, Quasars, Astronomical Photometry, Brightness, Cross Correlation, Telescopes, Time Lag

Scientific paper

From 10 yr of brightness monitoring of the two gravitational mirage components of Q0957 + 561 A,B it is shown that the time delay is 1.11 yr. An intensive program of daily brightness monitoring suggests a further refinement of the time delay to 404 days. Careful superposition of the phased brightness records shows that small differences are seen. These differences are attributed to microlensing by a star or stars in the lens galaxy.

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