English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We show that observation of the time-dependent effect of microlensing ofrelativistically broadened emission lines (such as e.g. the Fe Kalpha line inX-rays) in strongly lensed quasars could provide data on celestial mechanics ofcircular orbits in the direct vicinity of the horizon of supermassive blackholes. This information can be extracted from the observation of evolution ofred / blue edge of the magnified line just before and just after the period ofcrossing of the innermost stable circular orbit by the microlensing caustic.The functional form of this evolution is insensitive to numerous astrophysicalparameters of the accreting black hole and of the microlensing caustics networksystem (as opposed to the evolution the full line spectrum). Measurement of thetemporal evolution of the red / blue edge could provide a precision measurementof the radial dependence of the gravitational redshift and of velocity of thecircular orbits, down to the innermost stable circular orbit. Thesemeasurements could be used to discriminate between the General Relativity andalternative models of the relativistic gravity in which the dynamics of photonsand massive bodies orbiting the gravitating centre is different from that ofthe geodesics in the Schwarzschild or Kerr space-times.

Test of relativistic gravity using microlensing of relativistically broadened lines in gravitationally lensed quasars