1. Introduction
2. Data and Sample Definition
2.1. Observations and Data Reduction
2.2. Lyman Alpha Emitters Sample
3. Detection of Diffuse Ly α Emission
3.1. Image Construction
3.2. Surface Brightness Radial Profiles
4. Ly α Halo Modelling
4.1. Two-Dimensional Two-Component Fits
4.2. Error Estimation
4.3. Detection Limit
5. Ly α Halo Characteristics
5.2. Halo Sizes
5.3. Fluxes and Equivalent Widths
5.4. Ly α Line Profiles
6. Connecting Host Galaxies to Ly α Haloes
6.1. UV Properties
6.2. Comparison of Sizes
6.3. Size Evolution
7. Discussion
7.1. Probing the CGM
7.2. Origin of the Ly α Haloes