宇宙科学談話会

ISAS Space Science Colloquium & Space Science Seminar

ENGLISH

The Effect of Microlensing On the Observed X-ray Energy Spectra of Gravitationally Lensed Quasars

Henric Krawczynski
Washington University. in St. Louis

The Effect of Microlensing On the Observed X-ray Energy Spectra of Gravitationally Lensed Quasars The Chandra observations of several gravitationally lensed quasars show evidence for Fe K-α fluorescence line emission with time variable line centroid energies.

The time variability may result from the gravitational microlensing of the accretion disk emission, selectively amplifying the X-ray line emission from certain regions very close to the event horizon of the central supermassive black hole.

In this talk, I will present the latest observational results and will discuss the results from modeling the data with a general relativistic ray tracing code and microlensing magnification maps derived from inverse ray shooting calculations.

The simulations cannot fully reproduce the distribution of the detected line energies indicating that some of the assumptions underlying the simulations are not correct, or that the simulations are missing some important physics. I will conclude with a discussion of alternative explanations of the observational results.

Place: A 2F Conf. room(1236) / A棟2階会議場(1236号室)