Published in "Quasars and Cosmology", ASP Conference Series 162, Edited by Gary Ferland and Jack Baldwin. Astronomical Society of the Pacific (San Francisco), ISBN 1-886733-83-X (1999)., p.235


A REVIEW OF LINE AND CONTINUUM CORRELATIONS IN AGNs

Patrick S. Osmer

Department of Astronomy, The Ohio State University, 174 W. 18th Ave., Columbus, OH 43210
E-mail: posmer@astronomy.ohio-state.edu

Joseph C. Shields

Department of Physics & Astronomy, Ohio University, Athens, OH 45701
E-mail: shields@phy.ohiou.edu


ABSTRACT. We review the observational evidence for the Baldwin Effect, and the empirical behavior of emission lines in relation to multi-wavelength continuum emission for AGNs.


Table of Contents

INTRODUCTION

HISTORY
Discovery
Doubts and Confirmation

CURRENT STATUS
Observational Methods and Results
Slope as a Function of Ionization

DETAILED LUMINOSITY EFFECTS
The Importance of Luminosity Range
Second Order Effects

VARIABLE LUMINOSITY
The Intrinsic BE
The Intrinsic versus Ensemble BE

FURTHER SYSTEMATICS AND PHENOMENOLOGY
Line Profile Issues
Radio-loud versus Radio-quiet
The X-ray BE

THE BALDWIN EFFECT AT HIGH REDSHIFT
Evidence of Evolution
Preliminary Results at z > 4

SUMMARY AND FUTURE DIRECTIONS

REFERENCES

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