Ladies and Gentlemen. Due to the coronavirus epidemic in Poland, the CTP PAS is operating in a limited way. In particular, until further notice the secretariat and the accountancy of the CTP PAS will be working only remotely. Contact with the administration is possible only by an e-mail. We are sorry for any inconvenience.

Colloquium details

Name Center for Theoretical Physics Colloquium
Title Towards 3-D picture of active galactic nuclei

Until further notice, the Wednesday CTP colloquia will be starting at 12:30 PM.

Seminar will be given via Zoom:


Ask anyone from CTP PAS about password!!


Central parts of Active Galactic Nuclei are spatially unresolved but studying their radiation spectra and time variability astronomers try to recreate 3-D picture. In my talk I will mostly concentrate on the region located at a distance of hundreds or thousands of gravitational radii where broad emission lines are produced. These broad emission lines are the most characteristic features of the radiation spectra of active galaxies, and those features (Balmer lines) allowed in 60' to deduce the nature of quasars as extremely bright galactic nuclei at cosmological distances. Still the problem of the origin of the material forming these lines is not uniquely solved. We develop a model in which the matter comes from the accretion disk, lifted up  by the radiation pressure acting on dust. We calculate the motion of dusty clouds and confront the model with the observational constraints coming from the time delay of the line emission with respect to the continuum.

Time Wednesday, 15 April 2020, at 12:30 CEST The seminar was held!

Prof. Bożena Czerny  (CFT PAN)

Seminar Language English
Organisers Maciej Bilicki; Adam Sawicki; Krzysztof Pawłowski; Julius Serbenta;