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dc.contributor.authorFian, C.
dc.contributor.authorJiménez Vicente, Jorge
dc.identifier.citationC. Fian... [et al.]. Revealing the structure of the lensed quasar Q 0957+561 I. Accretion disk size. A&A, 654 (2021) A70. DOI: []es_ES
dc.descriptionWe thank the anonymous referee for the helpful comments, and constructive remarks on this manuscript. We thank the GLENDAMA project for making publicly available the monitoring data of Q 0957+561. C.F. gratefully acknowledges the financial support from Tel Aviv University and University of Haifa through a DFG grant HA3555-14/1. E.M. and J.A.M are supported by the Spanish MINECO with the grants AYA2016- 79104-C3-1-P and AYA2016-79104-C3-3-P. J.A.M. is also supported from the Generalitat Valenciana project of excellence Prometeo/2020/085. J.J.V. is supported by the project AYA2017-84897-P financed by the Spanish Ministerio de Economia y Competividad and by the Fondo Europeo de Desarrollo Regional (FEDER), and by project FQM-108 financed by Junta de Andalucia. K. R. acknowledges support from the Swiss National Science Foundation (SNSF). V.M. acknowledges the support of Centro de Astrofisica de Valparaiso.es_ES
dc.description.abstractAims. We aim to use signatures of microlensing induced by stars in the foreground lens galaxy to infer the size of the accretion disk in the gravitationally lensed quasar Q 0957 +561. The long-term photometric monitoring of this system (which so far has provided the longest available light curves of a gravitational lens system) permits us to evaluate the impact of uncertainties on our recently developed method (controlled by the distance between the modeled and the experimental magnitude di fference histograms between two lensed images), and thus to test the robustness of microlensing-based disk-size estimates. Methods. We analyzed the well-sampled 21-year GLENDAMA optical light curves of the double-lensed quasar and studied the intrinsic and extrinsic continuum variations. Using accurate measurements for the time delay between the images A and B, we modeled and removed the intrinsic quasar variability, and from the statistics of microlensing magnifications we used a Bayesian method to derive the size of the region emitting the continuum at lambda(rest) = 2558 angstrom. Results. Analysis of the Q 0957 +561 R-band light curves show a slow but systematic increase in the brightness of the B relative to the A component during the past ten years. The relatively low strength of the magnitude differences between the images indicates that the quasar has an unusually big optical accretion disk of half-light radius: R-1/2 = 17.6 +/- 6.1 root M/0/3 M-circle dot lt-days.es_ES
dc.description.sponsorshipTel Aviv Universityes_ES
dc.description.sponsorshipUniversity of Haifa through a DFG HA3555-14/1es_ES
dc.description.sponsorshipSpanish MINECO AYA2016-79104-C3-1-P AYA2016-79104-C3-3-Pes_ES
dc.description.sponsorshipGeneralitat Valencianaes_ES
dc.description.sponsorshipEuropean Commissiones_ES
dc.description.sponsorshipGeneral Electric 2020/085es_ES
dc.description.sponsorshipSpanish Ministerio de Economia y Competividad AYA2017-84897-Pes_ES
dc.description.sponsorshipEuropean Commissiones_ES
dc.description.sponsorshipJunta de Andalucia FQM-108es_ES
dc.description.sponsorshipSwiss National Science Foundation (SNSF)es_ES
dc.description.sponsorshipCentro de Astrofisica de Valparaisoes_ES
dc.publisherEDP Scienceses_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subjectGravitational lensing: microes_ES
dc.subjectQuasars: individual: Q 0957+561es_ES
dc.subjectAccretion, accretion diskses_ES
dc.titleRevealing the structure of the lensed quasar Q 0957+561. I. Accretion disk sizees_ES

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