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The Possible Origins of the $VR$ Magnification Ratios of Q0957+561AB

Published online by Cambridge University Press:  15 June 2005

A. Ullán ,
L.J. Goicoechea ,
R. Gil-Merino ,
M. Serra-Ricart ,
J.A. Muñoz ,
E. Mediavilla ,
J. González-Cadelo  and
A. Oscoz
A. Ullán
Affiliation:
Departamento de Física Moderna, Universidad de Cantabria, Avda. de Los Castros s/n, E-39005 Santander, Cantabria, Spain; email: [email protected], [email protected], [email protected], [email protected]
L.J. Goicoechea
Affiliation:
Departamento de Física Moderna, Universidad de Cantabria, Avda. de Los Castros s/n, E-39005 Santander, Cantabria, Spain; email: [email protected], [email protected], [email protected], [email protected]
R. Gil-Merino
Affiliation:
Departamento de Física Moderna, Universidad de Cantabria, Avda. de Los Castros s/n, E-39005 Santander, Cantabria, Spain; email: [email protected], [email protected], [email protected], [email protected]
M. Serra-Ricart
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain; email: [email protected], [email protected], [email protected]
J.A. Muñoz
Affiliation:
Departament dAstronomia i Astrofísica, Universidad de Valencia, Dr. Moliner 50, E-46100 Burjassot, Spain; email: [email protected]
E. Mediavilla
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain; email: [email protected], [email protected], [email protected]
J. González-Cadelo
Affiliation:
Departamento de Física Moderna, Universidad de Cantabria, Avda. de Los Castros s/n, E-39005 Santander, Cantabria, Spain; email: [email protected], [email protected], [email protected], [email protected]
A. Oscoz
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain; email: [email protected], [email protected], [email protected]
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Abstract

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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.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS225 , July 2004 , pp. 305 - 310
Copyright
© 2004 International Astronomical Union