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The Soft X-ray Excess in Quasars and Deep X-ray Surveys

Published online by Cambridge University Press:  19 July 2016

Ajit Kembhavi  and
A. C. Fabian
Ajit Kembhavi
Affiliation:
Inter University Centre for Astronomy and Astrophysics Ganeshkhind, Pune 411 007 India
A. C. Fabian
Affiliation:
Institute of Astronomy Madingley Road, Cambridge CB3 OHA England

Abstract

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We examine the surface density of quasars expected in the ROSAT PSPC surveys, using quasar optical luminosity functions and model continuum spectra including a soft X-ray excess. We show that the surface density is a sensitive function of the characteristic energy of the soft excess, and the absorption within the quasar as well as the interstellar medium. Comparision of the predicted surface density with the results of various surveys allows useful constraints to be put on the nature of the soft excess.

Keywords

ROSATQuasarsSoft X-ray Excess
Type
Correlations between Emission Components
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 217 - 220
Copyright
Copyright © Kluwer 1994 

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