Keywords: intensity mapping – diffuse Lyman alpha emission – large scale structure

1. INTRODUCTION

2. DATA SAMPLES  
2.1. Quasar Catalog  
2.2. LRG Spectra  
2.3. Ly α Forest

3. QUASAR-LY α EMISSION CROSS-CORRELATION  
3.1. Cross-correlation Transverse and Parallel to the Line of Sight  
3.2. Projected Ly α Emission Surface Brightness  
3.3. Multipoles of the Redshift-Space Two-Point Correlation Function  
3.4. Modeling the Quasar-Ly α Emission Cross-correlation  

4. LY α FOREST-LY α EMISSION CROSS-CORRELATION  

5. DISCUSSION: POSSIBLE LY α SOURCES  
5.1. Inner Part of Ly α Emission for UV-selected Star-forming Galaxies  
5.2. Outer Part of Ly α Emission from Galaxy Halos

6. SUMMARY AND CONCLUSION