Can gravitational microlensing be used to probe geometry of a massive black-hole?

Details Can gravitational microlensing be used to probe geometry of a massive black-hole? Can gravitational microlensing be used to probe geometry of a massive black-hole?

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..431p&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Astronomy and Astrophysics

Astronomy

Scientific paper

Astronomical Observatory, Belgrade, Yugoslavia (Serbia and Montenegro) Here we discuss the possibility to use gravitational microlensing in order to probe the geometry around a massive black hole. Taking into account that lensed quasars are emitting X-rays which come from the heart of these objects (around a massive black hole), we investigated the influence of microlensing on the shape of the X-ray continuum/Fe K-alpha line variability due to microlensing by stars from a foreground galaxy [1,2]. We considered an X-ray accretion disk in Schwarzschild and Kerr metrics that is microlensed by a straight-fold caustic and a magnification pattern [2]. We found that the changes in the shape of the X-ray continuum as well as Fe K-alpha line due to microlensing depend on assumed metrics. This shows that microlensing can be used to investigate an unresolved X-ray emitting region geometry around massive black holes. [1] Popović, L.Č., Mediavilla, E.G.; Jovanović, P., Muñoz, J.A. 2003 A& A...398..975P [2] Popović, L. Č., Jovanović, P., Mediavilla, E.; Zakharov, A. F.; Abajas, C.; Muñoz, J. A.; Chartas, G. 2005, ApJ (to be published in February 2006; astro-ph /0510271).

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