Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.171..115g&link_type=abstract
(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640
Astronomy and Astrophysics
Astrophysics
2
Active Galaxies, Galactic Nuclei, Galactic Structure, Gravitational Lenses, Light Curve, Quasars, Accretion Disks, Brightness Distribution, Gravitational Effects, Gravitational Fields, Relativistic Effects
Scientific paper
The central energy source of quasars and active galactic nuclei cannot be resolved by observation. When such a compact source is affected by gravitational microlensing (lensing of stars in a distant galaxy), brightness changes of the order of magnitudes may occur. Since it is an eclipselike effect, it gives the possibility of calculating the one-dimensional source profile from the light curve. This paper presents the method and the results of its application on simulated lightcurves. It should be possible to obtain information on the structure of the source on a scale smaller than 0.001 pc. The microgravitational lens effect gives, therefore, the only known possibility of observing directly the central energy source of quasars and active galactic nuclei.
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