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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

IMPACT FACTOR 2017 (Baltic Astronomy): 0.417
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ICV 2017: 121.03

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Volume 20, Issue 3


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

Teresa Mediavilla Gradolph
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  • Escuela Superior de Ingenieria, Cadiz University, Avda. Ramon Puyol, 11202 Algeciras (Cadiz), Spain
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/ Evencio Mediavilla Gradolph / Jose Antonio Muñoz
Published Online: 2017-03-23 | DOI: https://doi.org/10.1515/astro-2017-0312


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.

Keywords: gravitational lensing; galaxies active; AGN; quasars individual; QSO B2237+0305


About the article

Published Online: 2017-03-23

Published in Print: 2011-09-01

Citation Information: Open Astronomy, Volume 20, Issue 3, Pages 414–418, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0312.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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