Back to the article index

Article Contents

ABSTRACT

1.INTRODUCTION

2.VARIABILITY OF THE CONTINUUM IN LOW REDSHIFT RADIO-QUIET AGN

2.1.Continuum Variability in the Optical, UV, EUV, and IR Ranges

2.2.Variability of the X-Ray Emission of Seyfert Galaxies

2.3.Simultaneity of the Flux Variations at Various Energies

3.VARIABILITY OF THE OPTICAL CONTINUUM IN HIGH REDSHIFT AGN

3.1.Observed Characteristics of the Optical Variability

3.2.Microlensing as a Possible Cause of Quasar Variability

4.EMISSION LINE VARIABILITY: RATIONALE AND METHODS

4.1.Rationale for Emission Line Variability Study

4.2.Inversion Methods, Cross-Correlations, and Modeling

5.EMISSION LINE VARIABILITY: RESULTS

5.1.Results of Variability: The Stratification of the Broad Line Region in Velocity and Degree of Ionization

5.2.Mapping the Velocity Field from the Emission Lines

5.3.Other Issues Concerning the BLR

5.4.Summary, Perspectives, and Emerging Fields in Emission Line Variability Studies

6.VARIABILITY OF BLAZARS

6.1.Overview and Relativistic Beaming

6.2.Spectral Shape and Variability of the Blazar Continuum

6.3.Far IR-Optical-UV: The Thin Synchrotron Emission

6.4.X Rays: The Crossing of Different Emission Components

6.5.High Energy Gamma Rays: Where the Action Is

6.6.Periodicity of OJ 287

6.7.Variability of Emission Lines

7.MULTIWAVELENGTH STUDIES OF BLAZARS

7.1.Broadband Continuum Snapshots

7.2.Multiwavelength Light Curves and Correlations

7.3.Intensive Multiwavelength Campaigns

8.INTERPRETATION OF BLAZAR VARIABILITY

8.1.Summary of Variability Results

8.2.The Relativistic Jet: Synchrotron Radiation from the Outer Regions

8.3.High-Frequency Synchrotron Emission: Energy Stratification?

8.4.Inverse Compton Models: The Gamma-Ray Jet

8.5.The Invisible Jet Core

9.CONCLUSIONS AND FUTURE INVESTIGATIONS

REFERENCES