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High Resolution X-ray Spectroscopy of Active Galactic Nuclei

Published online by Cambridge University Press:  12 April 2016

Julian H. Krolik
Julian H. Krolik*
Affiliation:
Johns Hopkins University, Baltimore MD, USA

Abstract

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High-resolution X-ray spectroscopy has the potential to reveal a number of interesting features of active galactic nuclei, primarily, though not exclusively, through the measurement of absorption lines. After a brief review of the principal problems of AGN research, selected potential high-resolution observations are discussed with a view toward assessing their scientific value and the degree of resolution they will require. Two classes of observations pertaining directly to AGNs are discussed: Fe Kα spectroscopy relevant to the dynamical and thermal character of the emission line zones; and measurement of resonance line absorption by highly-ionized species in BL Lac objects, which should tell us about entrainment of interstellar material by relativistic jets. A third class of potentially important observations uses AGNs as background light sources in order to directly measure the distance to clusters of galaxies.

Type
7. Active Galactic Nuclei, Cosmic X-ray Background
Information
International Astronomical Union Colloquium , Volume 115: High Resolution X-ray Spectroscopy of Cosmic Plasmas , 1990 , pp. 262 - 273
Copyright
Copyright © Cambridge University Press 1990

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