Abstract
Due to their imaging properties, gravitational lenses may have a severe influence on the observations of distant sources as, say, QSOs or AGNs. This influence presents a serious difficulty to the interpretation of source counts and observations of individual sources, because it is clear that they are affected by lensing, but not how much. Only if we can estimate the extent of this effect, we can hope to extract reliable information about the sources themselves and not only about their images. To estimate the influence of lensing, a study of compact lenses alone is not sufficient, but one must also take account of the distribution of dark matter — some arguments in favour of this statement are presented below. The difficulty is that very little is known about the dark matter distribution throughout the universe.
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Bartelmann, M. (1992). Gravitational Lensing by Large-Scale Structures. In: Klare, G. (eds) Reviews in Modern Astronomy. Reviews in Modern Astronomy, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77543-7_18
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DOI: https://doi.org/10.1007/978-3-642-77543-7_18
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