Microlensing-based Studies of the Unresolved Structure of AGNs and the Composition of Lensing Galaxies

Mediavilla Gradolph, Teresa; Mediavilla, E.; Muñoz, Jose Antonio
Referencia bibliográfica

Baltic Astronomy, Vol. 20, p. 414-418

Fecha de publicación:
0
2011
Número de autores
3
Número de autores del IAC
0
Número de citas
0
Número de citas referidas
0
Descripción
Multiple images of quasars formed by gravitational lensing are typically seen through the lensing galaxy. The granulation of the galaxy in stars or other compact objects induces local (`microscopic') but strong fluctuations in the gravitational potential that subdivide each image in several micro-images changing the expected flux of the image (flux anomalies). This phenomenon, quasar microlensing, allows to study both the unresolved structure of the source and the composition of the lensing galaxy. We have applied a statistical analysis based on caustic crossing to the multiply imaged quasar QSO B2237+0305. The results indicate that the abundance of low-mass stars in the distribution of microlenses could be estimated with 10 years of monitoring.