Computer Science
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iaus..225..305u&link_type=abstract
Gravitational Lensing Impact on Cosmology, IAU Symposium, vol. 225. Edited by Yannick Mellier and Georges Meylan, ISBN 052185196
Computer Science
1
Scientific paper
We present VR magnification ratios of the double quasar Q0957+561AB, which are inferred from frames taken with the 2.56m Nordic Optical Telescope. From two different photometric techniques (pho2comC and psfphot) and a reasonable range for the time delay in the system (415-430 days), we find optical continuum ratios depending on the wavelength. These chromatic ratios are consistent with either differential extinction in a dust system or gravitational microlensing in the deflector. Although the dusty scenario is only viable for a compact dust cloud in the line of sight to the A component, the possible values for the differential extinction and the ratio of total to selective extinction in the V band are surprisingly reasonable. To decide on the true origin of the anomalous ratios (extinction, microlensing or a mixed scenario), we are carrying out new monitoring campaigns and planning detailed observations from the best ground-based and space telescopes.
Gil-Merino Rodrigo
Goicoechea Luis Julian
Gonzalez-Cadelo Juan
Mediavilla Evencio
Muñoz Joseph A.
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