[institut] [phys4phys] Seminar Katedre za astronomiju - 3. mart 2026.

[Katedra za astronomiju]

                     Seminar iz astronomije i astrofizike

                                  dr Edi Bon
                  (viši naučni saradnik Astronomske opservatorije)

            "Secular spectroscopic variability of active galactic nuclei:
  from accretion and broad-line region response to binary supermassive black holes modeling"

           utorak, 3. mart 2026. godine, u 18 sati, u ucionici 809.


Abstract: 
Our understanding of Active Galactic Nuclei (AGN) physics relies heavily 
on the study of their secular variability (long-term changes) that allow 
us to distinguish stochastic processes from the fundamental dynamics and 
evolution of these systems. Given that the dynamical timescales near 
supermassive black holes range from several decades to centuries, with 
viscous timescales being even longer, long-term monitoring is essential 
for distinguishing fundamental system dynamics from stochastic variations 
in their light curves.

In this talk, I will present how very long-term spectroscopic monitoring 
of AGN reveals the structure and physics of their cores. These studies 
have led to the identification of several spectroscopic supermassive 
binary black hole (SMBBH) candidates, for which we managed to constrain 
orbital parameters using their line shape variability. The talk further 
explores the physics behind extreme variability cases. We also examine the 
'Changing Look' phenomenon through the lens of two distinct triggers: 
viscous instabilities in the inner disk and tidal interactions during the 
pericenter passage of eccentric SMBBHs.

The final part of the seminar will focus on a unique research opportunity 
for motivated students. We have recently obtained new Gemini spectroscopic 
observations of radio galaxies with curved jets ('bent-tail' quasars) 
discovered by the ASKAP radio telescope. The spectroscopic data are 
currently in raw form and await reduction and analysis. This creates a 
chance for students to work directly with fresh, unpublished, cutting-edge 
observations, from data reduction and spectral decomposition to scientific 
interpretation, with realistic prospects for co-authorship in leading 
international journals and the development of a basis for future PhD 
thesis topics.

  ______________________________________

        DEPARTMENT OF ASTRONOMY
        Faculty of Mathematics
        University of Belgrade

        Studentski trg 16
        11000 Belgrade
        Serbia

   phone:     ++ 381 11 2027 827

   fax:       ++ 381 11 2630 151

   e-mail:    astronom at matf.bg.ac.rs

   internet:  http://astro.matf.bg.ac.rs

   skype:     dept_of_astro

   twitter:   http://twitter.com/#!/dept_of_astro

     facebook:  http://www.facebook.com/astro.math.rs
      ______________________________________



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