A partially occulting MACHO-microlensing event in the Twin Quasar Q0957+561

Abstract

A doubly-peaked quasar microlensing event in the lensed Twin Quasar Q0957+561 A,B (Colley and Schild 2003) is analysed within several lensing models. In the most realistic model a lens resolves in image B the ellipse shaped, bright inner rim of the quasar's accretion disk, intersecting it twice. This lens weighs 0.5 Earth mass and is located inside the Galaxy, at 3 kpc distance. During the passing, it partially occults the source, which allows to describe it as a primordial gas cloud of 1.4 Solar radius and 17 K temperature, in accordance with the theory of Gravitational Hydrodynamics. Lensing by such objects against the Magellanic Clouds and Galactic centre will also lead to occultation dips.

arXiv comment8 pages revtex, to appear in Fortschritte der Physik

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