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Article Contents

ABSTRACT

1.INTRODUCTION

2.OBSERVATIONS

2.1.Fraction of QSOs with BALs

2.2.Characteristics of BALs

2.3.Correlation Between BAL and Broad Emission Line Profiles

2.4.Emission Line Properties of BAL QSOs

2.5.Radio Properties of BAL QSOs

2.6.Optical Polarization and Variability of BAL QSOs

2.7.BAL Trough Variability

2.8.Imaging of BAL QSOs

3.MODEL PROPERTIES

3.1.The Starting Point of a Model

3.2.The Size Scale of the BAL Region

3.3.The Global BAL Region Covering Factor

3.4.The Large and Small Scale Geometry of the BAL Region

3.5.Is the BAL Region Flow Accelerating or Decelerating?

3.6.Abundances and Ionization in the BAL Region

3.7.Relation Between the BAL Region and the Emission Line Regions

4.RELATION TO THE NARROW ABSORPTION LINES

4.1.Similarity Between the BALs and the Narrow Absorption Lines

4.1.1.Z_abs Near Z_em Systems

4.1.2.Highly Displaced Metal Line Systems

4.1.3.Damped Ly- Systems

4.1.4.Ly- Forest Systems

4.2.The Effect of the BAL Region Outflow

5.FUTURE WORK

REFERENCES