X-ray Observations of AGN at Intermediate to High Redshift

Details X-ray Observations of AGN at Intermediate to High Redshift X-ray Observations of AGN at Intermediate to High Redshift

1999-04-22

arxiv.org/abs/astro-ph/9904318v1

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure. To appear in the proceedings of the 9th Annual October Maryland Astrophysics Conference, After the Dark Ag

Scientific paper

10.1063/1.58607

The cores of active galactic nuclei (AGN) harbor some of the most extreme conditions of matter and energy in the Universe. One of the major goals of high-energy astrophysics is to probe these extreme environments in the vicinity of supermassive black holes, which are intimately linked to the mechanisms that produce the continuum emission in AGN. X-ray studies seek to understand the physics responsible for the continuum emission, its point of origin, how nuclear activity is fueled, and how supermassive black holes evolve. The key to finding answers to these questions lies in measuring the intrinsic luminosities and spectral shapes, the relation of these properties to other wavebands, and how the source properties change with redshift. This article reviews X-ray observations of AGN from redshifts of ~0.1-3 with the goal of summarizing our current knowledge of their X-ray spectral characteristics. Results are evaluated in terms of their robustness and are examined in the light of current theoretical predictions of energy release via processes associated with the accretion mechanism. A possible evolutionary scenario is discussed, along with the importance of AGN studies at high redshift as they relate to the total energetics of the Universe.

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