A joint microlensing analysis of lensing mass and accretion disc models

Vernardos, G., Nov-2018, In : Monthly Notices of the Royal Astronomical Society. 480, 4, p. 4675-4683 9 p.

Research output: Contribution to journalArticleAcademicpeer-review

Microlensing of multiply imaged quasars is a unique probe of quasar structure, down to the size of the accretion disc and the central black hole. Flux ratios between close pairs of images of lensed quasars can be used to constrain the accretion disc size and temperature profile. The starting point of any microlensing model is the macromodel of the lens, which provides the convergence and shear values at the location of the multiple images. Here I present a new approach of microlensing modelling independently of the macromodel of the lens. The technique is applied to the close pair of images A(1) and A(2) of MG 0414+0534, for a set of flux ratios with large variation with respect to wavelength. The inferred accretion disc size and temperature profile measurements, as well as the smooth matter fraction at the location of the images, are quite robust under a wide range of macromodel variations. A case of using purely microlensing data (flux ratios) to constrain the macromodel is also presented. This is a first application of the technique on a fiducial system and set of flux ratios; the method is readily applicable to collections of such objects and can be extended to light-curve and/or imaging data.

Original languageEnglish
Pages (from-to)4675-4683
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - Nov-2018


  • accretion, accretion discs, gravitational lensing: micro, gravitational lensing: strong, quasars: individual: MG 0414+0534, DARK-MATTER SUBSTRUCTURE, BLACK-HOLE ACCRETION, EARLY-TYPE GALAXIES, GRAVITATIONAL LENS, MG 0414+0534, X-RAY, EMISSION REGIONS, STELLAR MASS, HALO MASS, QUASARS

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