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ESO - Thesis Topic: Why most supermassive black holes do not accrete material
 
 

Thesis Topic: Why most supermassive black holes do not accrete material

 

Thesis Supervisors: Evanthia Hatziminaoglou

 

External advisors: Kambiz Fathi (Stockholm University)



Abstract

Central regions of galaxies host a wide variety of structures and elements, making them the most intriguing parts of the Universe. It is in these regions that we observe the densest dust clouds, the most intense star forming complexes, and the interplay between the extremely strong gravitational forces and the most efficient mass-energy conversion mechanisms known to mankind. Not all these structures are seen in all galaxies, and to date a concise picture of the detailed processes that lead to the formation and evolution of each structure is missing. The purpose of the current project is to focus on one particular aspect unveiling the interplay between these extreme forces by combining high-resolution observational data with analytic dynamical models of galaxy evolution in order to gain important clues on the processes that help supermassive black holes in centres of galaxies accrete material. Implicitly, we will also better understand why most supermassive black holes fail in accreting material. To analyse our unique combination of observational data covering Optical to Radio wavelengths, we need to develop ever more powerful galaxy dynamical models and the goals of the project will include:

1) Analyse multi-wavelength data for selected galaxies to describe and quantify the different physical phenomena in their centres, and most notably to derive their central supermassive black hole masses. All the data are already reduced, so the student's work will focus on the application of different methods to understand the physics of the observed phenomena.

2) Develop analytic formulations for the derivation of a key dynamical parameter, the stellar and gaseous velocity dispersion, to model the complementary three-dimensional observations of the central regions of the selected galaxies.

The project aims a building a unique and attractive set of skills including analysis of multi-wavelength observations carried out with Spitzer, Herschel and Hubble space telescopes, ESO telescopes, and the ALMA Observatory. Along the way, the student will also build a good expertise on Spectral Energy Distribution Fitting, galaxy dynamics and analytic formulations that complement numerical simulations of galaxy formation and evolution.

A moderate background in astronomy together with strong mathematical skills (in particular in differential equations) is desirable to achieve maximum gain.