Despite its mathematical complexity, the multiple gravitational lens can be studied in detail in every situation where a perturbative approach is possible. In this paper, we examine the caustics of a system with a lens very far from the others with respect to their Einstein radii, and a system where mutual distances between lenses are small compared to the Einstein radius of the total mass. Finally we review the case of a planetary system adding some new information (area of caustics, duality and higher order terms).
|Titolo:||Caustics in special multiple lenses|
|Data di pubblicazione:||2000|
|Appare nelle tipologie:||1.1.2 Articolo su rivista con ISSN|