Modeling Quasar Microlensing
Ledvina, L.; Heyrovský, D.
Light from a distant quasar passing in the vicinity of a foreground galaxy gets deflected by its gravitational field. According to Fermat’s principle several macro-images of the quasar can then be observed. In addition, the light may be affected by the gravitational field of individual stars moving in the lensing galaxy, creating multiple micro-images. We cannot resolve them because of their small angular separation, but we can observe an associated increase in the source flux due to microlensing. We use simulations to show how the prominent X-ray iron Kα line is affected during the microlensing event. We describe in detail the underlying numerical integration involving divergent integrands.
type: | inproceedings |
pages: | 21 |
year: | 2015 |
link: |
https://www.mff.cuni.cz/veda/konference/wds/proc/pdf15/WDS15_03_f1_Ledvina.pdf
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grants: | Albert Einstein Center for Gravitation and Astrophysics, GAČR 14-37086G; 2014-2018; hlavní řešitel: Jiří Bičák
Centrum Alberta Einsteina pro gravitaci a astrofyzikuGravitational microlensing caustics and extended sources, GAČR P209/10/1318; 2010-2014; hlavní řešitel: David HeyrovskýNumerické simulace v obecné relativitě a astrofyzice; 2014-2016; řešitelé: Anton Khirnov, Lukáš Ledvina, Vojtěch WitzanyRozlišení struktury akrečního disku kvasaru; 2012-2013; řešitelé: Lukáš Ledvina, Vjačeslav SochoraAktuální problémy teoretické fyziky, astronomie a astrofyziky; 2015; řešitel: Oldřich Semerák |