Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.325.1527c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 4, pp. 1527-1532.
Astronomy and Astrophysics
Astronomy
13
Gravitational Lensing, Galaxies: General, Quasars: General, Quasars: Individual: Qso 0957+561
Scientific paper
We use archival g- and r-band photometry of the gravitational lens system QSO 0957+561A, B to estimate the intrinsic variability of the quasar during 1996 February-June. The light curves span 234d with temporal resolutions of about 2.5d. Both light curves display a single large-amplitude event, of ~0.1mag (max-to-min) in about 100d, followed by small-amplitude variations of ~0.02mag on time-scales of tens of days. We find the r-band variations lag those at g by 3.4-1.4+1.5d for the large-amplitude event. This lag is greater than zero at no less than 98 per cent confidence. The delayed coupling of the rest-frame UV intrinsic variations strongly suggests the existence of a stratified reprocessing region extending ~light-days from the putative central black hole source. The observed lag is consistent with that expected from a reverberation within an irradiated accretion disc structure. However, any definitive statement requires further detailed theoretical modelling and high-quality, signal-to-noise ratio of about 100, optical/IR simultaneous monitoring with about 3-d resolution for approximately 6 months.
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