Seminars take place in the lecture room of the Spořilov building (see contacts) unless noted otherwise.

Scheduled seminars

Searching for AGN in the era of JWST

Jan Scholtz

With the launch of JWST, we are now able to identify and study a population of moderate luminosity AGN above the redshift of 4 and constrain their growth and impact on their host galaxies. I will present results from the JWST Advanced Deep Extragalactic Survey (JADES), a joined 800 hours of NIRCam + NIRSpec GTO survey designed to give us an unparalleled view of the rest-frame UV and optical emission of early galaxies and AGN up to z=14. With this unique and deep data set, I will describe the benefits and pitfalls of selecting AGN at high redshifts. Finally, I will discuss our new constraints on seeding supermassive black holes and the role of AGN feedback in the early Universe.

Location: ASU - Spořilov, Boční II 1401, prezenčně, případně online:

Towards a new generation of reflection models for precision measurements of accreting black holes

Cosimo Bambi

Blurred reflection features are commonly observed in the X-ray spectra of accreting black holes. In the presence of high-quality data and with the correct astrophysical model, X-ray reflection spectroscopy is a powerful tool to probe the strong gravity region of black holes, study the morphology of the accreting matter, measure black hole spins, and test Einstein's theory of General Relativity in the strong field regime. In the past 10-15 years, there has been significant progress in the development of the analysis of these reflection features, thanks to both more sophisticated theoretical models and new observational data. However, the next generation of X-ray missions (e.g. eXTP, Athena, HEX-P) promises to provide unprecedented high-quality data, which will necessarily require more accurate synthetic reflection spectra than those available today. In this talk, I will review the state-of-the-art in reflection modeling and I will present current efforts to develop a new generation of reflection models with machine learning techniques.

Location: ASU Praha-Spořilov

If you would like to give a seminar, please contact Georgios Loukes-Gerakopoulos or Vladimír Karas.