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Amplification and variability of the AGN X‐ray emission due to microlensing
Author(s) -
Popović L. Č.,
Jovanović P.,
Petrović T.,
Shalyapin V. N.
Publication year - 2006
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200610675
Subject(s) - gravitational microlensing , physics , qsos , astrophysics , quasar , accretion disc , redshift , astronomy , spectral line , emission spectrum , accretion (finance) , galaxy
Abstract We consider the contribution of microlensing to the AGN Fe K α line and X‐ray continuum amplification and variation. To investigate the variability of the line and X‐ray continuum, we studied the effects of microlensing on quasar X‐ray spectra produced by crossing of a microlensing pattern across a standard relativistic accretion disk. To describe the disk emission we used a ray tracing method considering both metrics, Schwarzschild and Kerr. We found that the Fe K α and continuum may experience significant amplification by a microlensing event (even for microlenses of very small mass). Also, we investigate a contribution of microlensing to the X‐ray variability of high‐redshifted QSOs, finding that cosmologically distributed deflector may contribute significantly to the X‐ray variability of high‐redshifted QSOs ( z > 2). (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)