Physics and evolution of obscured X-ray sources: a multiwavelength approach

Details Physics and evolution of obscured X-ray sources: a multiwavelength approach Physics and evolution of obscured X-ray sources: a multiwavelength approach

2004-06-19

arxiv.org/abs/astro-ph/0406435v1

Astronomy and Astrophysics

Astrophysics

Introduction, goals and dissertation summary of my PhD Thesis, discussed at the University of Bologna, April 2004 (thesis advi

Scientific paper

Observations at high energies yield important information on the structure and nature of AGN; when coupled with deep optical and near-infrared (photometric and spectroscopic) follow-up, they provide constraints on the mass of the growing black holes and, therefore, are essential to better understand the nature of the various components of the X-ray background light and can be used as test for the accretion paradigm. Conversely, optical and near-infrared surveys of galaxies are crucial to discriminate between different cosmological scenarios (e.g. hierarchical or monolithic growth of the structures) and, thus, to recover the galaxy evolution path. In this framework, in the first part of the thesis, I will discuss the main results from an extensive program of multiwavelength observations of hard X-ray selected sources serendipitously discovered in XMM-Newton fields over ~1 deg^2 (the HELLAS2XMM survey). With a complementary approach to that of hard X-ray surveys, in order to investigate the link between nuclear activity and the galaxy formation, in the second part of the thesis I will present XMM-Newton and Chandra observations of photometric and spectroscopically selected Extremely Red Objects (EROs).

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