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dc.contributor.authorShalyapin, Vyacheslav 
dc.contributor.authorGoicoechea Santamaría, Luis Julián 
dc.contributor.authorGil-Merino Rubio, Rodrigo
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.date.accessioned2022-11-21T12:25:34Z
dc.date.available2022-11-21T12:25:34Z
dc.date.issued2012
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.otherAYA2007-67342-C03-02es_ES
dc.identifier.otherAYA2010-21741-C03-03es_ES
dc.identifier.urihttps://hdl.handle.net/10902/26521
dc.description.abstractNew light curves of the gravitationally lensed double quasar Q0957+561 in the gr bands during 2008-2010 include densely sampled, sharp intrinsic fluctuations with unprecedentedly high signal-to-noise ratio. These relatively violent flux variations allow us to very accurately measure the g-band and r-band time delays between the two quasar images A and B. Using correlation functions, we obtain that the two time delays are inconsistent with each other at the 2σ level, with the r-band delay exceeding the 417-day delay in the g band by about 3 days. We also studied the long-term evolution of the delay-corrected flux ratio B/A from our homogeneous two-band monitoring with the Liverpool Robotic Telescope between 2005 and 2010. This ratio B/A slightly increases in periods of violent activity, which seems to be correlated with the flux level in these periods. The presence of the previously reported dense cloud within the cD lensing galaxy, along the line of sight to the A image, could account for the observed time delay and flux ratio anomalieses_ES
dc.description.sponsorshipWe thank L. J. Hainline and C. W. Morgan for kind interactions regarding our respective pholometric approaches and data interpretations. The authors also thank the anonymous referee for valuable comments that improved the manuscript. We acknowledge the staff of the Liverpool Robotic Telescope (LRT) for their dedicated support and developmenl of the Phase 2. User interface, wich alows users to specify in detail the observations they wish the LRT to make. The LRT is operated on the islancl of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias with support from the K Science ancl Technology Facilities Council. This research has been supported by the Spanish Department of Science and lnnovation grants AYA2007-67342- C03-02 and AYA2010-21741-C03-03 (GLENDAMA Project),. and University of Cantabria funds.
dc.format.extent8 p.es_ES
dc.language.isoenges_ES
dc.publisherEDP Scienceses_ES
dc.rights© ESO (2012)es_ES
dc.sourceAstronomy and Astrophysics, 540, A132 (2012)es_ES
dc.subject.otherGravitational lensing: stronges_ES
dc.subject.otherQuasars: individual: Q0957+561es_ES
dc.subject.otherGalaxies: elliptical and lenticular, cDes_ES
dc.subject.otherBlack hole physicses_ES
dc.titleA 5.5-year robotic optical monitoring of Q0957+561: Substructure in a non-local cD galaxyes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherVersionhttps://doi.org/10.1051/0004-6361/201118316es_ES
dc.rights.accessRightsopenAccesses_ES
dc.identifier.DOI10.1051/0004-6361/201118316
dc.type.versionpublishedVersiones_ES


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