INTRODUCTION

2. SAMPLE SELECTION

2.1. Notes on Individual Objects

3. OBSERVATIONS AND DATA REDUCTION

4. SEARCHING FOR EXTENDED EMISSION

4.1. Spectra of the Extended Emission

4.2. Surface Brightness Profiles

4.3. Moment Maps

5. RESULTS AND DISCUSSION

5.1. Extended Halos and Quasar Host-Galaxies

5.2. The Kinematics of the Gas

5.3. The Powering Mechanism(s) of the Extended Halos

5.4. Ly α Nebulae and Galaxy Overdensities

5.5. The Average Surface-Brightness Profile

5.6. Extended Emission and Quasar Near Zones

5.7. Is the Halo Around P323+I2 Lensed?

6. SUMMARY AND CONCLUSIONS