Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535902s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #359.02; Bulletin of the American Astronomical Society, Vol. 42, p.546
Astronomy and Astrophysics
Astronomy
Scientific paper
It is important to extend the study of quasars to high redshifts in order to understand their evolution and environments. A relevant conclusion from modern studies is that the quasar luminosity function evolves positively with redshift, having a comoving space density strongly peaked at z 2 (e.g.,Schmith 1968, Warren et al. 1994). More recent findings suggest that the evolution of the space density of AGNs is strongly dependent on X ray luminosity, with the peak space density of AGNs moving to higher redshifts for more luminous AGNs > (e.g., Ueda et al 2003, Hasinger et al. 2005). The evolutionary trends in the space density of AGNs might have spectral counterparts which could be observable in X-rays. The main objective of this thesis is to study the spectral properties of AGNs in X-rays in order to increase our current knowledge of AGN evolution. We are especially interested in high redshift AGNs with z>1.0, because the analysis of their spectra may indicate what parameters show evolutionary trends and provide insight as to which physical processes are responsible for AGN evolution.
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