Thesis Topic: Black hole accretion versus star burst episodes: what is the engine of powerful active galaxies?

 

Thesis Supervisor: Paola Andreani

External supervisors: Luigi Spinoglio (IAPS-INAF, Rome, Italy), Kalliopi Dasya (OBSPM, Paris-Meudon, France), Matt Malkan (UCLA, CA, USA), Miguel Pereira-Santaella (IAPS-INAF, Rome, Italy)

Abstract


The recent observations of the Herschel Space Observatory have improved our view of the far-IR emission of local active galaxies.
Herschel imaging and spectroscopic data, together with other measurements at lower and higher frequencies (including Spitzer, AKARI, ALMA and IRAM submillimeter/mm ground-based data) allow us to built the detailed continuum spectral energy distributions (SED), as well as the atomic and molecular spectra of samples of local active galaxies.

The aim of this research project is to understand the emission mechanism(s) in powerful infrared-bright galaxies:
how much power is ultimately due to accretion onto supermassive black holes and how much is due to star formation processes ?

The methods that will be used include:
(1) modeling the observed multifrequency continuum SED and
(2) the mid-to-far-IR atomic and molecular spectra of samples of bright and nearby active galaxies (AGNs, Ulirg and Seyfert galaxies) with the use of radiation transfer codes and photoionization models, which can provide a complete physical model of the continuum and line emission of the sources.

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