0000000000143153

AUTHOR

R. Gil-merino

showing 3 related works from this author

New VR magnification ratios of QSO 0957+561

2004

We present VR magnification ratios of QSO 0957+561, which are inferred from the GLITP light curves of Q0957+561A and new frames taken with the 2.56m Nordic Optical Telescope about 14 months after the GLITP monitoring. From two photometric approaches and a reasonable range for the time delay in the system (415-430 days), we do not obtain achromatic optical continuum ratios, but ratios depending on the wavelength. These new measurements are consistent with differential extinction in the lens galaxy, the Lyman limit system, the damped Ly-alpha system, or the host galaxy of the QSO. The possible values for the differential extinction and the ratio of total to selective extinction in the V band …

PhysicsExtinction (astronomy)Continuum (design consultancy)Astrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsLight curveGravitational microlensingAstrophysicsGalaxyLyman limitNordic Optical TelescopeWavelengthSpace and Planetary ScienceAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy Astrophysics
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Microlensing of a Biconical Broad‐Line Region

2006

The influence of microlensing in the profiles of the emission lines generated in a biconical geometry is discussed. Microlensing amplification in this anisotropic model is not directly related to the bicone's intrinsic size but depends on the orientation of the bicone axis and on the cone aperture. The orientation of the projected bicone with respect to the shear of the magnification pattern can induce very interesting effects, like the quasi-periodic enhancements of the red/blue part of the emission line profile or the lack of correlation between the broad line region (BLR) and continuum light curves of QSOs. The emission line profiles of a BLR moving in a high caustic concentration exhibi…

QSOSPhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsQuasarAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysicsLight curveGravitational microlensingBiconeStarsWavelengthSpace and Planetary ScienceEmission spectrumAstrophysics::Galaxy AstrophysicsThe Astrophysical Journal
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A Fast and Very Accurate Approach to the Computation of Microlensing Magnification Patterns Based on Inverse Polygon Mapping

2006

A new method of calculating microlensing magnification patterns is proposed that is based on the properties of the backward gravitational lens mapping of a lattice of polygonal cells defined at the image plane. To a first-order approximation, the local linearity of the transformation allows us to compute the contribution of each image-plane cell to the magnification by apportioning the area of the inverse image of the cell (transformed cell) among the source-plane pixels covered by it. Numerical studies in the κ = 0.1-0.8 range of mass surface densities demonstrate that this method (provided with an exact algorithm for distributing the area of the transformed cells among the source-plane pi…

PhysicsPixelbusiness.industryInverseMagnificationLinearityAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsImage planeGravitational microlensingOpticsExact algorithmSpace and Planetary SciencePolygonbusinessAlgorithmThe Astrophysical Journal
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